Are you trying to find mountain bicycle frames among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!
We investigated and evaluated a number of the top-selling mountain bicycle frames on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 24 hours of research and did 46 mountain bicycle frames tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!
An overview of our top picks
Table of contents
The best mountain bicycle frames you can buy today
- Please note: Choose the right bike stickers for your bike, one is suitable for bicycle cranksets, one is for bike handlebar.
- Application: This bike frame protector fits for most bikes, like mountain bike, mtb, road bicycle, and so on. The size of bike stickers is 14*5.5cm.
- Material: The bike crankset/handlebar protector is made by 3M glue and PVC, durable, high adhesive. Using in decorating your bike is a nice choice.
- Function: The bike crankset/handlebar film can prevent the crankset/handlebar from collision, sand, scraches.
- Package Included: One pair of bike frame stickers.Only 11g.
- ✅【PRODUCT DESCRIPTION】Customizable Translucent Hi-Tack Vinyl Matte PVC Tape designed for high impact from external forces or environment. Our rugged paint protection film measures (4”x72”) leaving enough protective tape to cover the entire Toptube, Downtube, Chainstay and Rear Triangle of your mountain bike. Our product also includes a hand-tool and stencil for easy installation.
- ✅【DURABLE PROTECTION】Tougher 15 mils (.38mm) thicker material to protect from scratches and dings. These heavy-duty bike stickers are resistant to weather, water, small rocks, debris, sand and dust. Our high-quality helicopter tape has a matte finish which is proven to protect bike paint and prevent yellowing.
- ✅【COMPATIBLE】Our versatile bicycle decals can be used on many applications and materials. Adhesive compatibility ranges from Aluminum, Carbon Fiber, Glass, ABS, Bikes, Cars, Motorcycles, Helmets, Skis, Kayaks etc. The easy to cut universal stencils, allow you to customize your bicycle frame. Our mtb frame protection is compatible with all bicycle brands including: Trek, Santa Cruz, Specialized, Yeti, Giant, Cannondale, YT, Ibis, Pivot, Niner, Norco, Transition, Evil etc..
- ✅【EASY INSTALL】Stress free installation allows for faster positioning and helps to prevent wrinkles and bubbles. Peel away release paper promotes accurate placement and allows you to reposition the bike tape if necessary. Our heat activated all mountain style frame protection goes on easy and has a powerful automotive grade glue that will not leave a sticky residue on surfaces. Installation video included with purchase.
- ✅【UNIQUE STYLES】Fresh custom designs created by mountain bikers for mountain bikers! Simply, cut your DIY frame protection according to your imagination and stick your own style. For guidance use our preferred stencils provided in the box to insure adequate coverage.
- bike frame：27.5er/29er mountain bike frame aluminum alloy hardtail frame disc brake，thru axle 12*148mm.
- Process：racing frames，XC off-road grade, wind breaker, fish scale welding process，internal routing .
- Specification：44*56mm head tube ，31.6mm seatpost，S(150-165CM)/M(165-175CM)/L(175-185CM).
- Hidden internal routing：shifting brake and other control wires are hidden inside the frame to prevent wear and tear.
- Threaded screw-in bottom bracket：precision threads to enhance lateral stability, not easy to loosen, and reject rattles.
- UPGRADE WATER-RESISTANT DESIGN - Full Water-Resistant Fabric, bike frame bags are made of ultralight and stylish carbon fiber material and the zippers adopt high frequency seamless welding technology, effectively block rainwater from entering the bike bag quickly. that's the secret of our water resistant bicycle frame bags.
- 1.5LARGE STROAGE SPACE - The bike storage bag has enough inside room for your phone, small tire pump, mini binoculars, cycling glasses, bicycle repair tools & accessories, dust masks, keys, wallets, etc.Solve the troubles of long outdoor riding. The three sides of the bike bag ：Length: about 10.63 inches Width: about 7.08 inches , Height: about 2.25 inches
- EASY TO INSTALL & QUICK RELEASE: With 3 Adjustable velcro straps can easily fasten on the tube. it doesn't move around even if you ride on a bumpy or rocky road, and fit most mountain, and commute bike. Note: The triangle bag is at a right angle and is suitable for mounting on a bicycle with a right-angle bracket.
- PROTECTION AND DURABLE: The outside layer of bike bag is PU+Polyester, the middle layer is 5mm foam, the inner layer is polyester cloth. The outer layer is very wear-resistant, and the foam cotton protects the contents from being damaged.
- HUMANIZATION DESIGN: ① Big zippered opening mouth design for easy access. Durable zipper closure. ② Reasonable size, it would not rubs against your legs while riding. ③ Reflective trim on both sides of bags to keep your night ride safety. ④ Slim body design with high capacity to minimize the wind resistance.
- Superior Material & Water-resistant --- WOTOW bicycle frame bag is made of 600D Oxford, with smooth PU film coating, not only waterproof but also durable and anti-scratch. Upgraded seam-sealed zipper can stand thousands times zip and unzip, effectively prevent rainwater from entering and protect belongings dry and safe.
- Strap-on & Adjustable Position Install --- Unique designed loops all around the bag frame, plus 3 independent hook and loop fastener straps, the triangle bag can be installed securely and firmly under seat or near the handlebar, to not get in the way of water bottle bracket. The versatile install way make it fit for most mountain, road and commute bikes.
- Large Reflective Area for Night --- Equipped large reflective area on both sides, the slim frame bag can reflect lights from all direction and be noticed easily, keep your night ride safer. An ideal choice for cyclists who enjoy night riding or those need to use bike for commuting in dark.
- Well Organized Pockets --- With dimension of 8.9*6.1*2.2 inch (L*W*H), the bike storage bag has 1.5L large capacity. The left zipper slot perfect for cards and cash, and the right big compartment is easy to hold daily essentials such as mobile phone, power bank, gloves, sunglasses, flashlight, mini bike pump, bike repair tools and other accessories. The 2 interior layered pockets and key hooker help to organize the belongings.
- Dual Zipper Opening --- The right side main compartment of this frame bag adopted large opening mouth with double zipper, provide more convenience when fetch items. The non-slip zipper puller can easily be gripped even with winter thick gloves.
- COVER AND PROTECT ALL SIDES OF YOUR MOUNTAIN BIKE FRAME. Use Dragon Grips mountain bike wraps for frame to cover the important areas on any kind of mountain bike to defend against, dirt, sand, mud, and rocks that can scratch your frame on trails.
- TEXTURED NON-SLIP RUBBER PROTECTION TAPE. Our bike frame protection tape clear is non-slip and tough enough to protect from mud, dirt, dust, small rocks, and debris, giving you extra protection on downtube and chainstay protector while riding trails.
- EASY TO INSTALL & REPOSITION WITH MINIMAL RESIDUE. Our bike frame wrap decal is made of PVC rubber with self-adhesive acrylic, which is washable and weather resistant. Simply peel off the backing and stick on a clean surface with firm pressure.
- HIGH-IMPACT PRE-CUT PROTECTIVE BIKE TAPE FOR ANY SURFACE. Our package includes a 20pcs black set with instructions. At 0.5mm thick, this added bike frame protector layer is incredibly durable to help defend against scratches and dings.
- 100% MADE, MANUFACTURED, AND PACKAGED IN THE USA. Don't be confused by competitors who use cheap, substandard materials. Dragon Grips products entire supply chain is based in the USA and comes with a 1 year manufacturers warranty no questions asked.
- PROTECTION & STYLE. Safeguard your MTB frame from chips and wear without sacrificing style. Honeycomb PVC ensures durability and a cool look. Protects your bike from scratches and dings
- UNIVERSAL FIT. Designed for Trail, All Mountain, Enduro, Freeride, and DH bikes – easy installation on any frame
- DURABILITY. Made with automotive-grade materials, this protector won't yellow over time, guaranteeing long-lasting protection
- EASY INSTALLATION. Effortlessly apply the protector to even the most challenging curves, ensuring a perfect fit with minimal weight addition
- QUALITY MATERIALS. The high-impact, semi-rigid PVC with a strong adhesive stays intact longer than your bike, ensuring optimal protection
- Adjustable Position Install: Engineered with flexibility in mind, this Bicycle Triangle Bag features 2 secure installation options. Equipped with uniquely designed 3 removable velcros, this frame Bag can be securely and firmly installed beneath the seat or near the handlebar. Its adaptable installation method ensures compatibility with a wide range of mountain, road, and commuter bikes. *If the Velcro is too long, you can cut it to the right length
- 1.2L Large Capacity: Dimension of DANUOSIE top tube bike bag: 8.85 x 2.75 x 4.3 inches ( L x W x H). Equipped with a large main pocket, a mesh pocket inside the main pocket and two zipper pockets on both sides, this bag offers 1.2L of total capacity for holding keys, wallets, gloves, mobile phone, bike tire repair tool kits, cycling accessories, etc
- Side Pocket for Easy to Access: On both sides of our bike bag, there are pockets with waterproof zippers, ideal for storing essential items for quick and convenient access. Moreover, this bike bag is exceptionally slim, ensuring it won't interfere with your legs while you ride
- Water Resistant & PVC free: Crafted from waterproof material, and reinforced with smooth 900D Oxford fabric and PU coating for rainproof protection. Its sleek, fashionable look complements any cycling ensemble. Furthermore, our bike bag does not contain PVC, ensuring safer and more reliable long-term usage. *Although the seat bag is made of water-resistant fabric, it is not recommended to use it for long periods of time in heavy rain
- Large Reflective Area for Night: Its high-reflective design significantly improves your visibility during night rides, offering an added layer of safety by making you more noticeable to others in low-light conditions
- Material: This bike wraps for frame is made by PVC + 3M glue, give your bike durable and strong protection, high impact and leave no marks.
- Size: 395*60*2 mm (15.8*2.4*0.08 inch), fits most bicycles, such mountain bike, road bike, mtb, etc..
- Function: This bike down tube frame fenders can protect your bike from scraches, dings, collisons, make your bicycle more unique.
- Lightweight: The weight of this frame guard wraps is only 0.14 lb.
- 5 Colors Available: there are black, gray, orange, yellow, red colors frame protectors, it's easy to decorate your bike.
- High-quality Materials: The adhesive of this thick and durable bike frame protection is very sticky and strong, no worry it will fade or yellow over time.
- Great Protection: Protecting your bike frame from gravel, small branches or others dings and scraches.
- This frame protector is suitable for frame front fork.
- Application: The frame guard fits all mountain bikes, this size is ideal for trail, all mountain, endure, freeride, and DH bicycles.
- Easy to Install-Only for Reference.:1-Wash and dry your bike. Let the bike and stickers sit in the sun ( or with the help of a hair blow dryer) to warm up . 2-Clean the desired areas with rubbing alcohol and applied. 3-Use the hands to rub and secure each piece.
- TRIANGLE AERO BAG: Small and exquisite, mount well under the bike tube, will not touch your leg, make you do not notice it’s there while riding. Fits for most road bike, mountain bike or other type bikes.
- 0.7L CAPACITY: Suit for holding your cycling essentials like wrench, spare tube, patch kit, small bike pump or other repair tools. Please note it is a small bag, could not hold large phones, please check the bag size before buying.
- EASY TO ACCESS: Large opening for easy view the place of items, easy to take out. Smooth zipper for fast access to your belongings. An ideal bag for light trail/road riding.
- EASY TO INSTALL: Comes with four straps for mount on the bike frame, there are many place for custom fit. You can choose the way to fit your bike.
- GREAT CONSTRUCTION: The hard PE board around + thickened foam pads on two sides protect your item well in the bag. The reflective sign and logo on both side provide a warning effect and safer for night riding.
- LARGE SPACE: Bike bag has enough inside room for long rides, holds a lot of stuff like iphone X, battery, energy gel, small tire pump, repair kits, keys, wallet etc. Perfect compatible with cellphones below 6.5 inches, iPhone XR XS MAX X 8 7 6s 6 plus 5s, shake-proof bike front frame bag
- HIGH SENSITIVE TOUCH SCREEN: The bike phone bag has a high sensitive TPU film window which can helps you use cellphone easily while riding, great way to see your activity while using maps on a ride. (Note: Touch ID NOT worked through the screen cover)
- HUMANIZATION DESIGN: The bike phone mount bag has many humanization designs. A, The hidden earphone hole allows you answer the phone or enjoy music freely while cycling. B, reflective tapes on both sides of bike bags to keep your night ride safety. C, dual soft rubber zipper pulls make it convenient to open & close
- DURABLE & WATER RESISTANT: The bike top tube bag is made of ultralight and stylish carbon fiber material with sealed double zippers closure, which ensures the water doesn't flow into the bag.The sun visor and flashing board is great use for rainy or sunny day
- EASY TO INSTALL & QUICK RELEASE: 3 straps are firm enough to hold up on the bike, 1 velcro commuter strap on the front + 1 longer commuter strap on the upper bottom( the long strap can fixed the bag on the head tube firmly) + 1 commuter strap on the lower bottom. The bicycle bag would not move around even if you ride on a bumpy or rocky road
- ✔PORTABLE TRIANGLE BAG: Bike triangle bag only 0.35lb, total 1.2L space for daily use. Our designer has try many size standard for this bag to get the largest space and the best adaptability. This large and durable bike storage bag is designed for road, mountain and commute bikes.
- ✔DURABLE 3 LAYERS SHELL: ROCKBROS bike bag is made of the most durable shell. The outside layer is PU+Polyester, the middle layer is 5mm foam, the inner layer is polyester cloth. Durable material is very suitable for bicycle commuter, travel and daily storage.
- ✔LARGE STORAGE: Big enough to hold all of your tools and necessary things, small enough to sit under the frame of your bike. Spacious storage pocket to hold your phone, earphones and money clip, while the other big mesh pocket fits your keys, nutrition, and more.
- ✔STABLE 3 MOUNTS STRUCTURE: Bike frame bag has 3 straps for install on bike tube. This 3 staps are sewing on the bag and can hold bag stable. The triangle bag won’t move around even if you are riding on rough roads, and it is very easy to install by straps. The pouch fits for most mountain, road and commute bikes.
- ✔HUMANIZATION DESIGN: A. Big zippered opening mouth design for easy access. Durable zipper closure. B. Reasonable size, it would not rubs against your legs while riding. C. Reflective trim on both sides of bags to keep your night ride safety. D. Slim body design with high capacity to minimize the wind resistance. E.100% satisfied customer service.
- NEAR CUSTOM FIT - Comes in 3 sizes to fit most trail/mountain bike frames! Measure the inside length of your bike frame top tube, seat tube, and down tube and compare to our frame bag sizing chart to determine best fit for your bike!
- ★EVA SHELL: Unlike other front frame bags on the market,This bike storage bag made of EVA 3DShell material Which is more durable,Never worry about your bike bag will be squashed even broken.
- ★LARGE CAPACITY: This frame bag with large storage room, Medium:1.1L Size:22*7.6*6.8cm,can fit mobile phone below 6.2inches(iPhone X XR XS), Large:1.5L Size:24.5*10*8CM suit for phone below 6.5inches(iPhone XS Max). The main compartment with two net pockets inside of the bag holds your cell phone, wallet, keys,small tools, energy bar,gels,nutrition or mini pump.
- ★WAYER -RESISTANT MATERIAL: Our bike top tube bag made of water-resistant Carbon fiber PU surface material, also can be highly abrasion proof and durable. What’s more, equipped with a double sealed zipper.It can perfectly protect your phone and tools to small rain, NOTE:The bag is sewing product, best not to use in heavy rain or soaking in water for too long time.
- ★EASY TO INSTALL: Fastening with three strong adhesive hook&loop straps,our bike bag can be securely attached to the top tube, and it is suitable to most bike eg: mountain road bike ,folding bike (as rear saddle bag)
- ★COOL SHAPE DESIGN: This cool shape design can be the icing on the cake of your bike. Different from most type bike bags on market, the handlebar bag will often touch your knees.The design of Slim body will effectively prevent this problem.
- Item:Silicone Bicycle Chain Guard Protector, Colors:Black. Quantity:2pcs
- Perfectly protect the chain stay position of the bicycle, prevent the chain from shaking and falling off causing damage to the bicycle; prevent oil and rust, and protect the frame.
- The 3M adhesive on the back allows it to stand securely on your frame, and allows you to remove it for installation if necessary.
- Fits perfectly to the frame, avoiding the hassle of air bubbles and wrinkles, easy to fix without professional help
- Installation Tip 1: Before you install the frame, please wipe it down and make sure that there is no water, oil, or stains on the frame.
- Installation Tip 2：Do not remove and reinstall multiple times to prevent adhesive failure
- 【Bike Protection Sticker】The chainstay guards can satisfy different bicycles, helping to protect the chainstay and frame from being worn, prevent nicks and scratches, and provide protection from broken areas. Our bicycle protective films allow bikes to avoid paint damage to the bike. The self-adhesive films can be easily attached to the bike and protect against stone chips, chain impact, and grit damage.
- 【Quality Waterproof PVC】The bicycle frame protection carbon sticker is made of high-quality PVC, which is impact-resistant, high-temperature-resistant, fade-resistant, and durable with rounded edges, strong viscosity, and no traces. The bike frame protection film is waterproof, you can also ride it in a rainy and wet environment.
- 【Easy to Use】Our bicycle protective film covers are available in different sizes and stick where they fit. Does not lather or wrinkle when applied. Note: Before pasting, make sure that the surface of the pasting part is clean. If it is not clean, remove the stains on the surface before pasting. It can also be cut to the desired length to make it better fit your bike.
- 【Wide Application】The bike chain protector guard pad is suitable for most bicycles, mountain bikes road bikes, Endure, freeride, and DH bikes, etc. The bike chainstay protector decals can prevent wear of the paint of the bicycle paint, chain, etc., and also cover existing scratches.
- 【Various Size Set】You will receive 3 sheets of bicycle protective tape. Each sheet includes 20 pcs with an oval, circle, and strip of 6 different shapes for various positions DIY, which decorate bike chainstay and frame for fashionable styling.
- Dual Protection System: One purchase safeguards your downtube and chainstay. Protects against impacts and debris during rides, while preventing rust and stains. Maintains frame integrity, ensuring optimal bike performance.
- Enhanced Silicone Protection: Upgraded kit overcomes previous limitations. Extended and wider design with adhesive backing ensures secure frame fit. V-shaped pattern improves grip. Removes cleanly, leaving no residue.
- Versatile Compatibility: Suitable for XC//Trail/AM/Enduro/FR/DH bikes. Shields your ride across all terrains - from steep descents and jumps to endurance races and downhill challenges.
- Easy Application: Clean frame surface and allow to dry. Remove the silicone protector and peel off the backing. Align with the area to be covered, apply and press firmly to adhere. (Pro tip: Wait 24 hours for optimal bonding.)
- Package Contents: 1 x Chain stay protector, 1 x Down tube protector. Individually packaged for separate use.
- Universal: HOMEE bike rear rack suitable for most bicycles, such as road bike, mountain bike, fat bike, etc. (Kids' bike, soft bike, folding bike, small tire bike, uncommon rack and Trek Verve cannot be used). This bike back rack come with bike accessories and installation instruction, The Rack body is adjustable in size
- Easy To Mount: Shelf for back of bike length 21.65 inches, Width 5.7 inches; Panel Length 13.98 inches; Width 5.7 inches (Seat Tube Diameter: 0.85-1.3"/2.2-3.3 cm) adjustable for kinds of bikes. This bike back rack perfect for use with panniers, backpacks, baskets
- Durable: 110Lb Capacity, Durable Alloy Steel Rack for V Brake and Disc Brakes.
- Safety: Red rear reflector increase visibility on the night cycling to ensure your night cycling safety.
- W-Shaped Design: Bicycle cargo rack rear design with W-shaped bars to prevent pannier from hitting the tires, keeps your pannier safe.
- Silicone protector: Made of high-quality silicone material, it prevents chain shaking and continuous impact on the frame, protecting your bicycle's rear fork from damage.
- Good adhesion: Easy to adhere, this chain protector has excellent adhesive and good adhesion. No additional straps or tape need to be added to the top of this product.
- Package includes: bicycle silicone chain protective sticker
- Size: 240 x 41 x 10mm
- Function: This frame guard can protect your frame from the areas where the chain hits the most, making it suitable for all types of bicycles, especially BMX, road bikes, and mountain bikes.
How to choose a good mountain bicycle frames
Does the idea of finding a fantastic mountain bicycle frames make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!
Your presence here indicates that you are interested in mountain bicycle frames. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top mountain bicycle frames products available right now. You might be wondering how we came up with the list. How was this buying guide developed?
First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top mountain bicycle frames on the market right now!
The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:
Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top mountain bicycle frames brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.
Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top mountain bicycle frames based on those.
Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.
Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.
Customer ratings: Would it be accurate to suggest that the mountain bicycle frames were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.
Customer Reviews: Like ratings, provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.
Seller Rank: This is very intriguing! Not only do you need a good mountain bicycle frames, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.
Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your mountain bicycle frames.
Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting mountain bicycle frames for months and years to come.
Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.
Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.
These are the standards by which we selected our mountain bicycle frames. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.
Why should you believe us?
There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what mountain bicycle frames should you purchase in 2022?
This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on mountain bicycle frames.
