Bicycle frame construction, selection, maintenance, and repair.

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278 views

Can a tandem's front bottom bracket fail catastrophically?

Many tandems have a front bottom bracket that looks like this: The front bottom bracket is mounted off-centre in an aluminum shell called "the eccentric." When the pinch bolts shown in the ...
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2answers
16k views

Building my own full suspension MTB: How to I select a frame?

I've recently gotten back into mountain biking. I took my 5 year old Iron Horse full suspension out to the mountain with some friends that had recently purchased new bikes. I haven't ridden for a ...
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1answer
1k views

What does a good weld look like

Reading various questions and answers around here, I've heard a lot of people say you can tell the quality of the bicycle by looking at the welds. How do I know what a good weld looks like as opposed ...
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1answer
345 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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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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1answer
374 views

Will a track wheel work with the dropouts on my frame?

I've got an old 7 speed steel frame. I've ordered a track wheel with a spacing of 120mm. My frame has correct drop outs for it, but does it have the correct spacing? If not, what are my options? ...
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2answers
342 views

Can missing cage mount screws cause the frame to rust?

I have a Cube Analog Disc 2012 bike, and recently discovered that I have no screws inserted in the bottle cage mounts. Is it possible for rust to form in this area? Also, is it possible for the water ...
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1answer
2k views

Why is the swingarm design uncommon / rare on full suspension bicycles?

While watching a snow biking video, I saw that some of the bikes use a true swingarm design, which matches most motorcycles (as does much of bicycle technology). While this looks rather interesting, ...
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1answer
2k views

Is it possible to run standard mechanical shifting on a Scott Foil Premium frame?

The Scott Foil Premium is the highest end frame available from Scott Sports, and it is designed to run an electronic drive train, routed internally. The original reports were that this frame would be ...
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5answers
790 views

What's a good second lock option for around the frame and wheel?

I've seen a few people, specially bike messengers that use a main lock to secure their bike to a post/fence/etc. but also have a second smaller one to lock the other wheel around the frame. Which is ...
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3answers
3k views

Why offset the rear rim to the hub and not the hub in the frame?

I'm currently reading The Bicycle Wheel by Jobst Brandt, and I'm reading all of the issues with offsetting the rear rim toward the drive side of the hub... Asymmetry in a rear wheel built for a ...
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5answers
4k views

Which type of frame is better for a touring bike, steel or aluminium?

I hear that a steel frame is more comfortable to ride for a long tour but that it is heavier and easier to rust than aluminum. Which material is better for a touring frame?
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5answers
21k views

How to tell if a carbon frame is damaged or if the paint just has stress cracks

I am looking at a carbon framed road bikethat has me concerned.On the topside of the bottom bracket,drive side there is a very small hairline crack in the paint.The seller states that it has been ...
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4answers
503 views

Does the top tube typically open into the head tube?

This must be a very basic question, but as it often happens with very basic questions, it is often hard to find the answer by searching. On a modern bike with metal (welded) frame, is the interior of ...
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2answers
807 views

Why does a bike frame have to be above 56 cm usually to fit 700c tires?

I first came across this when I was looking at the Surly LHT, but I started to see it everywhere. It seems to me they can just put on a longer fork or something, or is it more for the back wheel?
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2answers
2k views

Tight Seatpost Installation

I'm having a bit of a problem installing my seatpost. I have a 31.6mm carbon-wrapped aluminum seatpost which fit perfectly fine in my previous aluminum frame. Unfortunately, that frame cracked, ...
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3answers
1k views

How important is it to face the head tube?

I have a frame that I've built up and I'm having trouble getting the tension perfect on the headset, which is not usually something I have trouble with. A friend of mine who is much more knowledgeable ...
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1answer
458 views

How to grease a hub?

I have a question about hub, When should I grease my hub ? every 20000 km ? How do I know it needs new grease ? Because I can not see if the grease is dry or not...? Thanks
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3answers
1k views

How to match a paint color?

Do you know how to match a color on the frame ? I want to buy a paint from a tool shop but I'm not sure if it's match with the frame color. I'm going to use the paint for a touch up. Thanks for the ...
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2answers
1k views

Why don't frame manufacturers ream/face their frames?

Before building up a new frame, it's crucially important to ream/face the headtube and crown race seat (and the bottom bracket, if using press-fit cups). You should also ideally chase the threads of ...
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3answers
513 views

Is a tri frame suitable for track racing?

I'm considering getting a fairly cheap bike built up for track racing at my local club, reusing my old carbon tubular road wheels. However, most track frames have a narrower hub spacing (120mm) ...
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0answers
65 views

What's the different between ceramic and steel bearing [duplicate]

Possible Duplicate: Real measurable benefit to ceramic bearings? What's the different between ceramic and steel bearing ? On the bottom bracket, what do you feel when you change into ...
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3answers
1k views

Can I use normal grease for a car on the surface of carbon bike?

Helo Guys, I want to know your experience about carbon material and grease Can I use normal grease with carbon ? I want to put grease onto fork and stem.... Or WD-40 or silicone penetrant would be ...
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2answers
358 views

Carbon seatpost dip in?

Can I insert a carbon seatpost up to 20cm deep into seat tube? The seattube is carbon as well. Total length of the seatpost is 35cm. The shape of the seatpost is aero seatpost (tear drop shape). It's ...
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1answer
1k views

Clear lacquer on steel frame

I'm currently working on a steel frame that I got off ebay. I'm removing the existing paint using wire brush adapters for a drill (didn't want to get involved in nasty chemical baths). One result of ...
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1answer
1k views

How to pull a carbon seatpost out of a carbon frame?

How do I pull out a carbon seatpost on a carbon frame? It seems so hard for me... Do I need a special tool, or just ask help from a local bike shop? done with the seatpost. I made the frame and ...
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5answers
453 views

What type of bike is appropiate for my situation?

First off, sorry for being unable to phrase my question more precisely. Currently, I ride a 26" hardtail mountain/trail bike to and from work/university (around 7km each way). Surely, this is not the ...
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9answers
7k views

How does a bike's weight affect the overall experience of owning it?

Naturally, carrying a light bike up the stairs is much more enjoyable compared to a heavier bike. Are there any other aspects of a bike which are affected by its weight? For example, would the weight ...
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2answers
511 views

Possible to repair a pushed in braze-on?

I have a Trek 7200 (Alpha aluminum frame) and it has two water bottle holder mountings, the top braze-on on the seat tube seems to have broken from over-tightening and has sunk into the frame. These ...
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1answer
440 views

Do kickstands damage the frame by being used?

I was told once that kickstands warp the frame when used, especially when the bike is laden down, and that some materials are more susceptible to this than others. Is there any truth to it?
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4answers
3k views

Why would a bike feature a “carbon wrapped aluminum frame”?

I saw a link to what appeared to be a Carbon bike on amazon. The price was extremely lower than any carbon bike I had ever seen. After reading a bit, it seems that the bike frame is really made of ...
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3answers
2k views

Should I Get the Paint Job Touched Up

My wife's bike recently got scraped up and the paint got scratched down to the frame. It's an alloy frame. Should she be concerned about rust or any kind of damage? If so, do we need to get it ...
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3answers
6k views

What are some other places to buy MTB frames online?

I am looking for sites that sell bike frames online. i find many sites list all things (forks) but stop short with frames. The best places I have found are: http://www.chainreactioncycles.com/ and ...
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1answer
376 views

Bamboo Bike Frames

I've seen some bamboo bike frames out there in the world. I am curious as to how they ride? Is it similar to a steel, aluminum, or carbon fiber frame? Do you think it's worth the effort to build one ...
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3answers
1k views

Vibrations in frame when pedaling

Recently, when I pedal sufficiently hard, I begin to feel vibrations through the whole frame of the bike. They are not so strong as to make the bike un-ridable, but neither are they road chatter. I ...
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7answers
5k views

Is there such a thing as frame failure?

Several general questions have been asked regarding how long a bike or bike frame will "last", and the gist of answers seems to be that a bike can last quite a while of the replaceable components are ...
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2answers
58k views

Frame sizing: “medium” vs. inches vs. centimeters

How in the world does 17-18 inches match up to 53-54 cm?? I was looking up bicycle sizing charts and found the ones on the Evans website interesting, if somewhat confusing. For example, see the ...
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2answers
605 views

How do I know if the tandem bicycle I've inherited is worth repairing? It has a serial # 459310 on it, no other identifiers

I've inherited a vintage tandem. It looks as if it has been spray painted, and has no identifiers, etc remaining on the frame. The serial # on the bottom reads -459310. Any ideas on a make or model, ...
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3answers
6k views

What belt-drive compatible frame and belt-drive kit would you recommend?

I would like to build a custom belt-drive bike for my daily commute. I am looking for a frame and a belt-drive kit for a total budget of about 500$. I ride all year long, and winters here (Montreal, ...
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1answer
397 views

What tools are required to begin building a frame?

What tools are required to begin building a frame? Are there DIY substitutes for any of them? Are there things that aren't requirements, but simplify the process enough to be worth the cost? Aside ...
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2answers
2k views

Does anyone have experience with Bottom Bracket Tap/Facing sets?

I'm interested in recommending my boss get the workshop in which I work a bottom bracket tap and facing set. As it's quite an investment it's important to me to know what you're getting for your ...
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2answers
99 views

Putting brakes from a fat frame onto a skinny frame

I took a bunch of parts off of a bike with a hybrid titanium/carbon frame (it died), and am using them to build up a bike from a sweet steel frame I got on ebay for a song. It's my first time building ...
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2answers
1k views

Is torque relevant for steel/aluminium? Where do I find torque specs?

When you are not dealing with carbon, is torque relevant? I've never seen it mentioned on the hundreds of answers here, or the hundreds of how-tos I've read elsewhere. Should I just tighten ...
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3answers
2k views

Is this aluminum “rust” in my frame?

I found an aluminum bike in the trash and it seems like it has been exposed to the rain, especially because some of the metal is slightly rusty. The frame is a different thing, because altough it is ...
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3answers
4k views

Metal seat post with carbon fiber frame?

Is using a metal seat post on a carbon fiber frame advisable or not? I want to use a seat post mounted rack on my road bike (no regular rack mount points are on this bike), but I have been told that ...
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3answers
22k views

DIY Painting a Bike Frame: Is it possible?

I have painted a couple bike frames (think really cheap garage-find rebuilds) with varying degrees of failure. Can you help me correct/fill in the missing pieces of my frame painting process? ...
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7answers
20k views

What are the advantages and disadvantages of riding a smaller Mountain Bike frame?

I am 182cm (5' 11'') tall and am looking into buying a new frame for my mountain bike. Right now i have a 19'' frame and i found a good deal on a 17'' frame. The guy from the shop told me that it ...
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3answers
4k views

What benefits does a tapered head tube afford?

I've just read a review of Tom Zirbel's Jamis Xenith SL on Bike Radar and flicking through the pictures there is one of the head tube with the following caption: Tom Zirbel's (Jamis Sutter Home) ...
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1answer
1k views

How do I fix a dent on my frame?

I suspect that something has pierced my frame. At any rate, I have a dent in my bike frame. I would like to avoid the possibility of corrosion, with minimium cosmetic trade off. So, how do I go about ...
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5answers
973 views

Why is it common for cheap bikes to have the frame sawn in half below the saddle?

These days cheap bikes often seem to come with the frame sawn in half below the saddle. What does the manufacturer gain from this design, and why is it associated mostly with cheap, low quality ...