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Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

23
votes
4answers
16k 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 ...
21
votes
4answers
55k 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? ...
10
votes
2answers
574 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 ...
19
votes
2answers
7k 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 ...
17
votes
10answers
19k 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 ...
2
votes
3answers
5k views

Can a (relative) beginner adjust spacing on a 501 cromo road frame?

Have acquired a cheap old Peugeot road bike from ebay; nice cromo frame, but it needs a new rear wheel and unfortunately I didn't check the dropout size before buying. It has an OLD of ~120mm, but I ...
24
votes
8answers
131k views

What are the differences between men's and women's bike frames?

Why do women's bikes have a diagonal bar in the frame instead of a horizontal frame? Is this the only difference? Sorry if this has been asked (but I cannot find it by searching) and I also just ...
4
votes
3answers
50k views

Determining which derailleur hanger is compatible with a frame

When your derailleur hanger needs replacing, is there a good resource for matching frames to hangers? Mine was recently bent, so I had to dig through some websites and compare pictures of the hangers ...
9
votes
4answers
28k views

How can I tell if the size of a bike is right for me?

Today I disassembled my current fixed-gear, and reassembled all the parts in another frame, which I am considering to purchase. The current owner of the frame warned me that it might be too big for ...
15
votes
10answers
9k 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 ...
15
votes
6answers
26k views

How many years an aluminium frame lasts in a touring bike?

How long does an aluminium frame lasts in a touring bike? [Removed extra questions to be clear.] Background So far I preferred aluminium vs. steel for many reasons, but if steel lasts significantly ...
25
votes
5answers
53k views

Should my foot be able to step flat on the ground, when I sit on a bike seat?

I was wondering, for a correctly sized mountain bike, or hybrid, should I be able to place my foot flat on the ground, when I sit on the bike seat?
12
votes
4answers
11k 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 ...
21
votes
7answers
5k views

I keep breaking my road frames - why?

I've gone through four five frames in the last decade or so, all from different manufacturers, all steel but both lugged and welded both steel and aluminium. Every one of them has eventually developed ...
19
votes
2answers
1k 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
2answers
19k views

Is it possible to repair a dent on an aluminium frame?

I have Centurion Cyclo Cross 4000 bike. Recently I got into an accident with a car door. As a result I have a significant dent on my frame(see the photos below). I have two questions: Is it possible ...
8
votes
2answers
157k 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 ...
4
votes
4answers
17k 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 ...
0
votes
2answers
301 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 ...
14
votes
3answers
2k views

What is this spring between the fork and the frame?

Sometimes on a bike I see a short spring, most often covered in rubber, connecting the fork with the frame: What is the purpose of it? The only thing that comes to mind is stabilising the fork so it ...
9
votes
3answers
4k views

Is my derailleur hanger too bent?

I bent the (steel) derailleur hanger on my 9spd cassetted (steel) Bianchi Volpe about 1.5 yrs ago, and I just did it again, but worse. This time the derailleur got sucked into the wheel and really did ...
7
votes
2answers
4k 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
3answers
1k views

How much longer will my 10 year old frame last?

My friends say it will last forever, and not to worry about it. Online results show anywhere from two years to 25. I have no clue what to expect!! Let me give some context. I bought a decade old ...
5
votes
6answers
2k views

How long will this alum frame last?

I picked up this very cool 96-97 GT rage from Craigslist with the intention of restoration- a few rusty pinch bolts, spider eggs in the brake hoods, grinding bearings and pitted races, and all the ...
3
votes
1answer
184 views

Understanding the bike geometry through riding [closed]

Though this question has been asked a lot of times, and there are very good answers out there, all the answers talk about the effect of individual parameters in isolation. That is, they take trail, ...
3
votes
2answers
2k views

Maintenance on an Aluminium frame

I have an aluminium frame. The top tube has become slightly scratched or pitted (by something hard, presumably, I don't know what; maybe while it was parked). Does it need maintenance (e.g. does the ...
2
votes
3answers
766 views

Could you make a bike frame out of 24kt gold?

Obviously it's a silly idea. Apart from the cost, it's far too dense and not stiff enough to be a good frame material. What I'm asking is would it be possible to make a ridable bike from gold? What ...
2
votes
1answer
4k views

What make is my BMX frame?

I have a BMX forsale, but I would like to know what make the frame is so I can determine how much it is worth. Does anyone recognise this symbol on the frame? Thanks for your help Jon
32
votes
4answers
33k 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 ...
5
votes
2answers
4k 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 ...
22
votes
18answers
4k views

What different frame materials have been used?

In response to yet another frame materials question, I thought it might be useful to start with a more answerable question. One answer per material please, with an example of a bicycle frame using ...
9
votes
1answer
14k 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 ...
28
votes
2answers
14k 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 frame....
11
votes
3answers
12k 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 ...
9
votes
6answers
594 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 for ...
8
votes
2answers
3k 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 fit?...
8
votes
3answers
18k 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 ...
7
votes
3answers
8k 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 ...
6
votes
4answers
5k views

Advantages of mounting bottle under frame

I'm wondering if there are any advantages to mounting ones water-bottle on the bottom of the down tube, near the ground, versus on top of the tube. I'm mainly interested in the advantages, or lack ...
11
votes
3answers
1k 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 ...
9
votes
5answers
81k 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 ...
8
votes
2answers
19k 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?
7
votes
5answers
12k 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?
2
votes
1answer
197 views

can anyone help i.d. this bike?

I can not find any numbers on frame, only the crown on tank.
1
vote
3answers
563 views

How do I make my frame water tight?

I am trying to remove the rust from inside my steel frame. There are, however, a few small holes in various places along the frame. Any tips on how I can make these water tight so that I can fill it ...
16
votes
3answers
19k 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.
13
votes
4answers
5k 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 "...
12
votes
10answers
73k 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 ...
11
votes
7answers
38k 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 ...
9
votes
1answer
942 views

What's the definition of a Mixte?

What makes a mixte frame? Further, what's the etymology of 'mixte'?