Bicycle frame construction, selection, maintenance, and repair.

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3answers
625 views

safety of carbon fiber bonded to aluminum fork crown

I recently experienced the failure of the carbon fork on my 2001 K2 Mod3 road bike at 20 miles per hour. Yes, I was injured. My question is the bonding agent that secures the carbon fiber fork to the ...
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1answer
118 views

How to test the endurance of a frame?

I am planning on throwing a challenge to create a bamboo frame for a unicycle, but to declare a winner I shall test some endurance criteria. The frame should be able to withstand this kind of ...
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1answer
399 views

Fitting questions - Effective top tube vs horizontal

I'm stuck in understanding size tables of a bike. For example this size chart: Am I right in my thoughts? Effective top tube (ETT) is horizontal value so, it's B1 on the chart. BS is the length of ...
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1answer
263 views

measure dropout to fit chain tug

I want to buy a chain tensioner, like the one in the first picture in this answer. I did some research and it looks like they have different size, according to what they call "dropout size". In fact, ...
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1answer
259 views

Derailleur Hanger replacement for GTS R5 road bike frame

I'm looking for an online site where I can buy a derailleur hanger replacement for my GTS R5 road frame. The frame is the one in the picture ...
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1answer
435 views

34.9mm front derailleur on steel frame?

Can I fit a 34.9mm front Shimano derailleur on my steel frame? I understand that steel frames are narrower. However, is there some sort of adapter that I can use, or can I even wrap the frame around ...
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1answer
26 views

Can a bike frame be retrofitted with internal cable routing without Disassembly?

Would I be able to have a local framebuilder retrofit an existing steel mountain bike frame to install internally routed cable guides on the top tube without disassembling the frame? I would probably ...
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0answers
83 views

Help identifying MTB frame

Apologies making ANOTHER one of these threads...Anyhows: Bought a bike third hand, frame has been stripped and painted. Trying to find make & model so I can get some offset bushings for the shock. ...
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0answers
50 views

Columba folder w/mountain 10sp cassette & Sram X7 derailleur

On my bike the derailleur mounting bracket (hanger) is held by the hub axle and therefore fills some of the dropout slot on one side and pushes the axle lower in the slot on that side. So the axle is ...
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0answers
99 views

Size advice needed for Revolution Country Traveller touring bike

I'm about to by my first touring bike. I've got a very tight budget so I will probably order a Revolution Country Traveller from Edinburgh bicycle cooperation as it looks like it will suit my needs. ...
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0answers
174 views

Schwinn Vestige no longer lights up; why not?

I have the Schwinn Vestige and a very long, bumpy, dirt/gravel driveway. A few weeks ago, we rode downtown and the frame lit up amazing, as it should. On the way home, it was not lit up. Hmm. After ...
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0answers
181 views

Lowrider style bent forks techniques

Would a 24 inch bent fork fit on a 20 inch frame? Is there even a 24 inch fork? Would a 26 inch fit? Also if it doesn't fit in could I just add to the 20 inch - would you be able to extend it making ...
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2answers
858 views

Where can I go to change the vertical drop out for a horizontal drop out?

I have an aluminum road bike frame that I want to use to build a fixed gear. My problem with this frame is that it has vertical drop out and no derailleur hanger. Fr
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5answers
2k views

51cm top tube too small for someone who normally cycles frame with 55cm top tube?

I'm looking to buy a second bike and have found a really nice frame. The bike I cycle at the moment, which fits me perfectly (I am 5'11" (180cm)), has a 55cm top tube. The frame I'm looking at has a ...
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4answers
4k views

if my height is 5'9" what mtb should I buy? [closed]

I am rookie and I want to know about mountain bike and want to know that if my height is 5.9 which mountain bike works for me. So guys please help to know about mountain bike.
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2answers
240 views

Do I need to chase a thread before installing a bottom bracket on a new frame?

Currently I'm building a new Surly Cross Check, and it needs a 68mm BB (english threaded). Furthermore, I plan to use a cheap $15 shimano BB with JIS square tapered interface, nothing special. Do I ...
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1answer
240 views

Does anyone know what kind of bike this is?

I found this bicycle a while back and have been planning on either fixing it up (if it's worth it) or selling it. All I have, really, is the frame. I haven't been able to find out exactly what it is ...
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3answers
2k views

Is hydroformed tubing good?

I've recently saw that a bmx frame was hydroformed.Is it better than not hydroformed?
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4answers
450 views

Bike too big for me

I bought a bike online based on a recommendation that a 56cm frame would be ok for me (I am 5ft 10, with 30" inside leg). However I think it is slightly too big. I have to lean forward a lot and my ...
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3answers
245 views

Creaking sounds from the saddle tube?

I've started to hear creaking/clicking sounds from the saddle tube. Is the frame giving up? I could look for a longer saddle post, if that would relieve some of the strain on this part of the frame, ...
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1answer
193 views

Replacing 28in wheels with 26in

I'm told that when touring (carrying a big load) you're much better off to have 26" wheels than 28". But most second-hand bikes seem to come with 28". Is it possible to replace the larger 28" wheels ...
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2answers
239 views

I need to change my bike from UK to US Spec

I bought a bike from the UK. The brakes and shifters are on the opposite sides. I want to change it so the front brake is on the left and the rear is on the right, Same thing for the shifters. I ...
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1answer
269 views

Shimano Hollowtech II bottom bracket: milling the frame necessary?

In a bike shop I recently asked for bottom brackets. The seller said, when choosing a Hollowtech II bottom bracket (like SM-BB70), compared to Octalink/square taper bottom brackets the outer (lateral) ...
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1answer
99 views

Behring custom made bike

Hoping someone can help me as I don't know much about bikes. I bought a 10 speed bike at a garage sale which the owner said was custom made by a bike maker in St. Louis, MO. She said the frame was ...
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2answers
141 views

Information about an old frame

I'm looking for information about this frame- it's my trusty touring bike, and I've been gradually upgrading it - next up is to convert to 700c and a modern chainset (probably sora to keep costs down) ...
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2answers
234 views

How to repaint a Carbon bike frame?

I have recently purchased a Specialized Roubaix SL4 Elite Disc carbon frame bicycle - But I am not particularly happy with the colour. It is charcoal and white. I like to have a brighter colour. Is ...
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2answers
95 views

Remove paint from the head tube

I'm planning to build a new bike from scratch. Part of that is buying a new frame, and possibly facing/reaming it. That's actually the part I'm scared of the most. Fortunately, the brand I'm ...
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3answers
255 views

Water inside bike frame

My latest "project" involves my bike, i.e. I want to perform a complete renovation of it. This involves changing rim, complete shift group, brakes, hubs, carrier etc, just keeping frame, seat post and ...
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1answer
149 views

Is there a way to remove the dent/bend?

I have a 2005 KHS Flite, which I am fairly sure is a Reynolds 520 frame, that I absolutely love and have morphed through many variations (the original brakeless fixie, then both breaks free-wheel, ...
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2answers
135 views

How to protect underneath the frame?

I've searched and only found this and this. But what I am really after is on a solution on how to cover/protect the underside of your frame. I have a carbon road bike with mostly a white painted ...
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1answer
153 views

would I be able to put new rear wheel with 12mm x 142 axle on my 2007 RM Element 70 frame?

would I be able to put new rear wheel with 12mm x 142 axle on my 2007 RM Element 70 frame in terms of dropouts compatibility?
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1answer
1k views

How to avoid or reduce back-pain by adjusting the handlebar and seat of 19.5" MTB?

I'm 6' 3" long, having 45 inches of waist-Toe length. I bought Trek 3500, 19.5" sized frame bicycle two months ago. I've been experimenting with the handlebar and seat positions(Forward n Backward) to ...
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1answer
402 views

Gap between fork and frame

I removed the fork from my old racer because I was hit by a car. When I'm trying to put the new fork on the frame, I get a gap where the top bearing is situated. What should I do? Could I just remove ...
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1answer
48 views

determining make model and year of a BMX frame

is there a specific website where I can simply enter the bicycle serial number to determine the make model and year primarily BMX frames
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1answer
92 views

Rear disc calliper won't fit, disc mount bent?

I am upgrading my MTB to disc brakes. I have disc compatible wheels and a set of Shimano M446 Postmount callipers and 160mm rotors. Front fork is a Manitou who decided to jump on the Postmount wagon ...
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2answers
101 views

Rear derailleur hitting chainstay (video in the post)

I filmed a little video of the process: https://youtu.be/ejJsIWrrFTU Does anyone know how to solve the problem? Apart from attaching piece of rubber to the chainstay? It is really annoying, because ...
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2answers
117 views

What accommodations might be made for riding a frame 4'' too large?

I have been offered possession of a very old and interesting bicycle, made in 1933. It appears to be in quite good condition, and has a lot of interesting history. However, it features a 26'' frame, ...
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2answers
282 views

How do I tell the difference between bike brands

I have a 20 inch BMX bike. It was given to me with no stickers or identifying marks on it. How do I tell the difference between brands?
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2answers
206 views

unknown make model and year

enter image description here! Can someone please help me identify this frame? I have tried searching the net for same lugs design but I can not find anything that is similar to the lugs of this ...
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1answer
143 views

Trying to figure out the Brand/Make of this bicycle?

Got this from a friend hand-me-down style. Got some work to do on it to make her roadworthy. But it's been painted, and I can't see a logo or name on it anywhere. Steel Metal Frame. That's about all ...
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1answer
105 views

Mongoose stamped vs. unstamped

What's the difference between a Mongoose that has logo stamped on frame and a Mongoose with no stamp on it?
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2answers
5k views

Carbon Fiber vs. Aluminum [duplicate]

I am a new cyclist who is on my 2nd year of biking. I bought a cheapo Schwinn MTB at Walmart to start with but now I want a real road bike. I currently have $2k saved up and am looking into a ...
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1answer
312 views

Allez vs Secteur [closed]

I'm buying my first road bike. I don't plan on racing, but riding long distances, and comfort is one of my top priorities with quality. I tried a 58 Allez in my local shop and it felt like a dream but ...
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1answer
91 views

Y-Foil Frames Rear Suspension?

I have a few questions about the Y-Foil frame (beam frame) Firstly as far as i have seen, there is no rear suspension system, does the fact that there is no seat tube offer suspension and dampening, ...
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2answers
350 views

A bike smaller than is recommended

I have 180cm and the recommended size for me is 58cm or so, which i already have, a classic Peugeot racing bike. Works relatively ok but i found that i ride it better when i'm leaning forward and keep ...
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1answer
12 views

MInor (I think) dent in top of Orbea Alma top tube - frame ok or no?

2015 Orbea Alma alum frame top tube, looking front left to back right. This pic gives the best angle on the contour - the sides of the top tube feel unaffected by this dent, and you can see from the ...
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1answer
44 views

Fort Frame head tube cracked

I have raced my Fort Bike for some time now. The head tube holding the forks has split /cracked open. What do I do now, who do I contact ? Dennis
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4answers
185 views

Disadvantages of Riding Larger Frame Sized Bike than Reccomended Frame Sized Bike

I unconsciously bought a bike which's frame size is larger than recommended. (My height is 163cm bikes frame size is for people 174-190cm) (I dont have any problems with reaching ground with my feet ...
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0answers
53 views

Bike Frame Brand and Model?

enter image description hereI purchased this bike at a thrift shop and it rides like a dream. Out of curiosity I'm trying to figure out the make and brand. The parts on it seem to be very nice so ...
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0answers
111 views

how to paint your bike in flat colors?

I'm painting my bike matt black I already have etching primer and a project source matt black I dont know if its good for the primer any suggestions and do any matt painting need matt clear coat??