Bicycle frame construction, selection, maintenance, and repair.

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6
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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 ...
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 ...
16
votes
4answers
12k views

Explaining the effects of frame geometries

I asked about buying a bike here, and someone asked on my behalf about test-riding a bike before buying. My question is, what should I know, or should have known, about the sizing or 'geometry' of a ...
1
vote
2answers
924 views

FEM: How to Design weight-distribution in bike prototypes?

Inferio! No-one can understand this bloated question here, now more focussed. Suppose you are doing a new bike. How can you be certain that some critical point won't get too much force and the right ...
4
votes
1answer
257 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 ...
14
votes
2answers
3k views

Bamboo bikes - the verdict?

I'm curiously interested in buying a bamboo bike for use as a Sunday road bike, and I'm just wondering whether they're suitable: Strength at high speed? I live near Parbold, which has nice hill ...
15
votes
6answers
3k views

I keep breaking my road frames - why?

I've gone through four frames in the last decade or so, all from different manufacturers, all steel but both lugged and welded. Every one of them has eventually developed a crack, been repaired and ...
26
votes
6answers
29k views

Why is carbon fiber inherently weak? Or is it?

This question got me to thinking: If it were possible for me to use a carbon frame, I would, but the expense and my riding style keep me using steel and aluminum. (I like hauling stuff on racks and ...
9
votes
1answer
565 views

What's the definition of a Mixte?

What makes a mixte frame? Further, what's the etymology of 'mixte'?
14
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3answers
7k views

Repairing a bent bike frame, is it worth it?

I have a bike with an incredibly bent frame. The bike itself I have tried to replace with other inexpensive bixes, but this one just had a certain geometry that I keep wanting to resurrect it. It is ...
5
votes
1answer
496 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 ...
7
votes
2answers
1k views

Switching Parts to a New Frame

What things do I have to consider when planning to switch parts from one frame (old one) to another frame (new one)? Will all the parts transfer? What items may need replacement because they won't ...
21
votes
4answers
14k views

How can you recognise a quality steel frame?

I'm looking to buy/build a road bike and I would like it to: last 100 years have a low environmental cost As I'm not interested in shedding grams (a diet would be more helpful for me), I'm leaning ...
18
votes
1answer
11k views

Road bike carbon fiber frame life span

I have read in several places that the carbon fiber has a shorter life span than the aluminium, and i was wondering just what would it be. I am not referring to accident related failures of the ...
8
votes
2answers
2k views

What should I consider when choosing a bike frame?

In thinking about building a road bike from scratch, what should I consider when choosing a frame? I'll be building from all new components and plan on just doing day rides of a few hours a piece, ...
8
votes
3answers
643 views

non-steel frames and longevity

Until recently, I had a late 80's Schwinn aluminum frame bike (now a thief has a 80's Schwinn aluminum frame bike, but that's another story). I had heard a number of horror stories about early ...
14
votes
2answers
3k views

Dealing with rust on a steel frame

I have a small spot of rust on the bottom side of my steel frame's top tube (Columbus Niobium tubing). It's from abrasion during transport that I didn't notice until it was too late. The spot is ...
13
votes
9answers
6k views

Removing Seat Post rusted into downtube

I have an old steel frame (Columbus Number 2 I think) that has the seat post (Suntour Superbe Pro - see, I said it was old!) rusted in. I have tried lots of WD-40 but it will not budge. Any tips on ...
13
votes
2answers
862 views

How to prepare a frame for a new paintjob

I want to have my bike frame repainted. What should I do before I give it to the paint shop? How would they like to have it prepared?
12
votes
3answers
2k views

What are the advantages of investment casting?

I'm starting to see more and more frames using investment casting for head tubes, drop outs, seat tubes, etc. Such as the new WTP c.r.e.a.m. frame . It looks nice, but I'm suspect on how much more ...
13
votes
5answers
6k views

Rear wheel slipping out under load

My commuting/cyclocross bike (a Surly Crosscheck) has a problem. If I tighten the quick release skewer to a normal level, sort of firm to close it, then if I step on the pedals hard at some point, ...
5
votes
1answer
997 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 ...
13
votes
3answers
11k views

How do I measure the size of my bicycle frame?

From what point to where do I start measuring? I suspect the bike I'm trying to measure is a 56cm because I usually ride a 54 and this is slightly too big, but I want to be sure.