Bicycle frame construction, selection, maintenance, and repair.

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6
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1answer
304 views

S shaped down tube (MTB)

Are there any advantages of S shaped down tubes over the traditional ones on MTB? For example: what do you think of this design? Jamis Exile Comp 2013
6
votes
2answers
885 views

How to choose between a race bike like a Madone and a classics bike like a Domane

I ride regularly for exercise in New York City but do not race. I currently ride on a steel frame that handles the rough roads easily. I want to buy a carbon bike and am torn between a "classics" bike ...
6
votes
2answers
85k 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 ...
6
votes
4answers
1k views

Why aren't sportive' 'bikes popular outside the UK?

I recently bought a 'sportive' bike, i.e. very much like a road bike but with a taller head tube to give a slightly more upright, more relaxed, less 'heads-down' riding position, and a triple chainset ...
6
votes
3answers
5k 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 ...
6
votes
2answers
504 views

How bad is this fire damaged alloy frame?

I got this Shimano Ultra groupset bike for free, all I need now for it is shifters as the carbon and rubber melted in them and the original seat. But now I am wondering if I can get away with it, I ...
5
votes
5answers
928 views

What can I do about a cracked frame?

I noticed the other day that my frame has a crack in it! I believe that it's my seat post causing the problem. A couple of questions really, a) how serious is this? and b) can it be repaired? Edit: ...
5
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6answers
8k views

Don't integrated headsets wear out, ruining the frame?

I came upon this marvelous explanation of headset types. However, this got me wondering. Isn't the role of the headset cups similar to that of the derauler hanged - to not waste the frame as soon as ...
5
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3answers
835 views

Cable routing and why is there no optimum solution

This is a general question, regarding the routing of the cables of both brakes and derailleurs on a frame. I find it highly practical to mount all cables along the bottom of the top tube. This ...
5
votes
2answers
4k views

Is it possible to compensate a short sized frame by adjusting seatpost and stem?

Could you achieve the same position you would have on a bigger frame by raising seatpost and stem? And how could I adjust those to "simulate" a bigger sized frame?
5
votes
1answer
361 views

3D printing frames?

Are there any technical limitations that make 3D printing frames impractical? And, if it is just a matter of time before our technology is able to overcome any limitations (like manufacturing ...
5
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3answers
2k views

26“ vs 28” wheels for touring

I was told by a friend that 26" wheels are better than 28" wheels for touring. Is this true? What are the pro's and con's? I'm told that 26" wheels are stronger for their spoke count. What are the ...
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5answers
32k 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 ...
5
votes
2answers
2k 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 ...
5
votes
6answers
5k views

Fixie/Single speed frame information for beginner

I don't want to buy a ready made bike because singlespeed or fixed gear bikes are way expensive due to their popularity. I want to make my own bike, I haven't build a bike from scratch before. I want ...
5
votes
2answers
2k 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 ...
5
votes
1answer
4k views

How much does non-ideal frame size matter?

I have an opportunity to buy a barely-used Allez Elite for a very small amount of money (around $100). However, its frame size may be slightly different than the "ideal" size for me. If this ...
5
votes
4answers
261 views

Alternative uses for an aluminum MTB frame

Any alternative use for old mountain bike tyres and inner tube? So my frame has a large crack near the headtube and I am replacing it. Could I use the frame in any other way? E.g. give it away ...
5
votes
1answer
2k views

How feasible is it to transfer modern (2010) components to a 90s frame (road bike)

My 2010 aluminum frame may be toast (stripped bottom bracket) and I was considering getting an older chro-mo frame and transferring the components to it. It's a racing/sport style with drop bars and ...
5
votes
1answer
450 views

Repairing Carbon / Aluminum frame

My road bike is aluminum with a carbon rear triangle. The carbon rear slides into the aluminum, and I believe was bonded with some sort of epoxy. The pieces have begun to separate after 2.5 years ...
5
votes
1answer
886 views

What is the significance of rear travel of a frame?

Every suspension frame has the the following two parameters: shock travel and rear axle travel at maximum shock compression. I have a lot of questions, regarding those two: What are they properly ...
5
votes
1answer
500 views

Cyclocross bike frame considerations

I'm considering putting together a cyclocross type bike together for fun and variety. Is a typical road frame suitable for this? And, what do I need to consider in terms of sizing? On sizing, it ...
5
votes
1answer
1k views

Experience with welding Titanium frame?

My Litespeed Tachyon, a 1996 model, of which I am the second owner, (So Litespeed will not honour the warranty) has now developed its 3rd crack. First was in the seat tube above the deraullier and I ...
5
votes
1answer
273 views

how to strip the paint from a bike yourself?

How can I strip the paint from a bike frame? I tried using a sander and it left really annoying scratch marks on the frame. Is it possible to use a chemical paint stripper to completely remove the ...
5
votes
1answer
410 views

Strange logo on the frame

I just bought this bike, but it seems like the frame is not Bianchi, all marks and texts are stickers. Also, there are quite a few logos on the frame. Does anyone know which frame this is? Thanks! ...
5
votes
1answer
565 views

What bike do I have?

I have recently purchased a bicycle from a second hand shop. It seems to have all sorts of different parts. The frame however has a badge and markings of 'Kontroll' made in West Germany. Doing some ...
5
votes
1answer
439 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 ...
4
votes
2answers
834 views

Why are bike frames getting so much bigger

This is just a general interest kind of question, but I've really been wondering about this lately. We've had a lot of advancements in bikes over the years, and people are always trying to make them ...
4
votes
4answers
983 views

Titanium frame has a crack - advice needed

I've found a Titanium bike frame on eBay. It's very cheap and the owner says that it has a very small crack on the seat tube where it connects to a bottom bracket. See at the image below: I've ...
4
votes
2answers
24k 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 ...
4
votes
4answers
106 views

What is the purpose of a serial number?

It seems like pretty much everywhere I look, serial numbers can't do the things that it seems they should be able to do. They can't help people figure out what bike they have. They can't help at all ...
4
votes
3answers
399 views

Convert old road bike to comfortable commuter

I have an rather old road bike, that I'd like to convert to a comfortable commuting bike. The bike should be used for everyday commuting (< 5km) and occasionally day tours. I'd like to keep the old ...
4
votes
4answers
5k views

Type of cycle for losing weight and staying fit for a beginner [closed]

Over a year ago I was diagnosed with a collapsed arch in my left foot and despite trying many times I have not been able to get back on the treadmill. I have been thinking of getting a bicycle to ...
4
votes
3answers
6k views

Attach bottle cage to frame w/o mount screws

I'm planning on getting a bottle cage for my bike, but my bike does not have the standard mount screws for one. As I understand it, there are two types of cages: bolted cages and clamped cages. I'd ...
4
votes
2answers
339 views

Does frame size inside a particular model affect the ride characteristics of the bike?

I read an article stating that the smallest of a particular model of bicycle doesn't fully reflect the original design concept of the model when I was about to buy the smallest (430mm seat tube) of ...
4
votes
4answers
349 views

What is this brown goop on my new bike frame?

I'm building a single speed bike, and ordered parts from various different places. My EAI Bareknuckle frame got delivered this morning, and it looks great, except for this part of the fork, that has ...
4
votes
3answers
300 views

Size question. Performance v Comfort

I was checking some bikes on Decathlon (a large sports orientated chain store) and I found this size guide for some of their BTwin bikes. On their chart [pdf] that maps rider measurements to bike ...
4
votes
4answers
613 views

I need help to identify this bike

This is my mother in law's bicycle from when she was a child. While cleaning out a lean-to on the back forty I found this bike inside. I was hoping to give her a bike that is identical to hers that ...
4
votes
3answers
402 views

Down tube and seat stay

I've noticed that in a lot of bikes (though certainly not all), the seat stay and the down tube are parallel or nearly so. Is there any structural reason why a manufacturer might make that choice or ...
4
votes
1answer
653 views

Can i stop my frame scratching my seatpost?

I have an On-One Scandal aluminium frame, into which i have put a carbon seatpost. I have been adjusting it to find the right height, and i have noticed that it is getting seriously scratched - see a ...
4
votes
2answers
2k views

Is there much of a difference between flatland and park/street frames?

I am a newbie at biking, and I've been wanting to get into BMX for a few years, and I can now since I actually have some money. Primarily I've been wanting a 20" BMX bike with front and rear brakes ...
4
votes
3answers
5k 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) ...
4
votes
1answer
299 views

Frame that takes 700x35

I'm looking for a new frame. My only requisite is that the frame should be able to take 700x35 wheels (the type of wheel I want). How can I know if a frame is suitable or not for these kind of ...
4
votes
1answer
258 views

How to find a frame given a geometry

In 2007, I bought my first bike: a Bianchi Boardwalk 2006. It was a great bike, but I didn't treat it well and it now needs about $300 worth of work. I've been thinking that maybe I'd like to take ...
4
votes
1answer
2k 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 ...
4
votes
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 ...
3
votes
8answers
21k views

How can you remove logos from a bike frame?

I'm trying to remove all these annoying labels from my bike. On the main frame there is one big logo, but I'm not sure if it's a sticker or not. The frame is black, but it's very cheaply made, and the ...
3
votes
4answers
413 views

Is a custom road frame worthwhile?

I've been riding a Marin San Anselmo hybrid for some 13 years and I'd guess I've done over 7000 miles on it almost exclusively on the road (and it's not my commuting bike). I'm gradually doing more ...
3
votes
3answers
708 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) ...
3
votes
2answers
319 views

Trying to build a bike, confused about fork/headsets/compatability

I have a fork with a 1" steerer tube, and a frame with a 1.5" head tube. The steerer tube is slightly short, and when inserted into the frame, is flush with the top of the head tube. The fork is ...