Bicycle frame construction, selection, maintenance, and repair.

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36 views

Can someone help identify my bike frame?

I needed to replace my old fixie frame with something lighter, and with a standard BB shell. So I came across this one online. The seller bought it off a friend who stripped and painted it, so any ...
3
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3answers
1k 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, ...
7
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0answers
349 views

Name that frame! (Likely Japanese, likely made in 1986, with known serial number, but with an unknown manufacturer)

I have a bike frame of unknown lineage. The bike question is if the manufacture can be identified from the serial number. What is known: The serial number under the bottom bracket is IS513786 The ...
9
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2answers
140 views

What is the difference between a horizontal top tube and a sloped one?

Some comparable bicycles have a crossbar (top tube) that's horizontal: Others have one that's sloped: What are the reasons for either frame design? Is it merely style preferences? Or is there ...
6
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2answers
108 views

difference between rack mounts and fender mounts?

is there a specific way that bike builders build mounts/eyelets for racks for panniers and eyelets that hold fenders? I'm specifically thinking about eyelets on the rear dropouts. I know that if a ...
5
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5answers
470 views

High-quality commuting bike with “women's” frame

My wife wants a high-quality commuting bike (riding almost an hour each way five days a week). However, she wants it to be compatible with skirt-wearing and, as a result, refuses to have a frame with ...
2
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2answers
98 views

Protecting carbon bike frame after a small chip?

My bike frame is carbon and it recently got a small chip. It's about the size of a pinky fingernail in size. Should I do anything to treat the chip to help prevent it from getting worse?
3
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6answers
156 views

“Creaking” noise from headtube/handlebar

I have a steel frame (Columbus steel, made by Dancelli), and when I put weight on the ends of the handle bar, I hear a creaking noise from the headtube. It might not be the handlebar because I tried ...
3
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0answers
168 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 ...
4
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1answer
114 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 ...
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3answers
162 views

Tough road or touring frame/bike

I recently had my bike destroyed by a car. I love cycling, and since I'm no longer a research fellow, I'm considering replacing it with a bike with great longevity (N.B. I know that until a process is ...
2
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1answer
103 views

Calculate frame stack and reach

Is is possible to calculate stack and reach for framesize 63?
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2answers
131 views

restoring the finish of an oxidized polished aluminum frame?

In the context of restoring the finish of an oxidized once-polished aluminum finish, is there anything better (easier) than 0000 steel wool with Marvel Mystery Oil? I am restoring an old Cannondale ...
9
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3answers
266 views

Why do some triathlon seatposts go straight up and down instead of at an angle?

Why is it that some triathlon bikes have a seat post that adjusts straight up and down instead of the more standard axis that aims at the bottom bracket? This means that if you raise (or lower) the ...
4
votes
4answers
319 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 ...
1
vote
2answers
200 views

Knowing what bicycle frame material I have

I have a bicycle frame that's really heavy. It's a mountain bike frame with shocks, so I decided to replace the entire frame with a city bike aluminum frame(I only use the bike if I have to pick ...
12
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5answers
439 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?
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1answer
61 views
8
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1answer
261 views

Help please to identify my Tandem

I have just purchased an old tandem, but don't know the make or year. Can anyone help me to identify it. The frame is steel and it has a frame number of 452599. There are no decals fitted but I attach ...
-2
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1answer
117 views

Can a road bike be transformed intto an mountain bike? [closed]

I have a rigid road bike right now, can I transform it into a full suspension mountain bike?
4
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1answer
90 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 ...
0
votes
4answers
153 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.
0
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3answers
161 views

What are the advantages of a custom frame for a touring bike?

I'm building a new bike for touring while traveling, so I want a break-apart frame with S&S couplers, like the Salsa Vaya Travel, or another steel touring frame retro fit with couplers. I want a ...
1
vote
2answers
192 views

Cannondale six13 52cm Carbon top tube?

One for the Cannondale nuts: I've got a real soft spot for the Cannondale six13 and have been after one for ages. A 52cm has popped up for sale which would be ideal but I've noticed that it has a ...
2
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1answer
95 views

How do I identify the manufacturing year of a Surly pacer frame?

I am looking at purchasing a used Surly Pacer. However, the owner is unsure of the year (he also bought it used). Are there any visual cues that I can use to identify the year of the frame?
2
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2answers
153 views

Carbon frame strengh

Almost every question Bicycles.SE about damaged carbon frames seems to get the same answer: "the frame isn't safe anymore." How strong of a hit is needed to break a carbon frame? There are little ...
0
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9answers
374 views

Are there any manufacturers of steel road bikes today? [closed]

Is there any major bike manufacturer that still makes steel road bikes today? The frame of my old Bridgestone got cracked and the crack is too close to the alloy BB lug for me to be able to weld it. I ...
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2answers
181 views

How to build a fixie bike? [closed]

I’m thinking about building a fixie and was wondering what are the best types of frame, wheels etc to use and how long the whole building process may take?
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4answers
278 views

Why don't race bikes have solid front triangles?

I know that cutting material out makes a bike lighter, but at some point there must be a crossover between weight and aerodynamics. Since tri-bikes and track bikes have more oval/flat shaped tubes, ...
4
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2answers
332 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
2answers
248 views

Do I need to plug internal cable routing ports?

I have just ordered a OneUp Components 42T sprocket and a Race Face 30T Narrow/Wide single ring so that I can convert my 3x10 drive train into a 1x10. This means that I'll be removing the front ...
0
votes
2answers
114 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) ...
12
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7answers
3k 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 ...
1
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1answer
176 views

What is the frame called that fits 700c wheels?

I have a set of 700c wheels and am looking to buy a used frame. I want a frame that fits the 700c tires so I don't have to file down the front dropouts or use long reach brakes. What are the frames ...
4
votes
1answer
273 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 ...
0
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1answer
73 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, ...
3
votes
3answers
217 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 ...
2
votes
2answers
211 views

Building a 36er bike [closed]

I'm casually researching building a 36er bike, preferably mountainbike style. I'm looking for the experience of others on this. I would like to own it more for curiosity sake than any other, but would ...
0
votes
1answer
615 views

What's an “Auto-Mini” folding bike? Can I use one for decades without having to replace the frame?

I've been thinking of buying an internally-geared folding bike for commuting (5 km each way) and errands. I want to spend $100-$200, but I want a reasonable-quality frame; I don't want to ever have to ...
5
votes
1answer
198 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 ...
2
votes
2answers
136 views

Bike frame measurements

I'm 6'2 and ride an XL hardtail. I found a killer deal for a full suspension that is a Large frame. Since I am basically right in the middle of large and xl frames would it work riding a large? I'm ...
1
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1answer
100 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, ...
3
votes
4answers
396 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 ...
-1
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1answer
129 views

Is there a best suspension frame? [closed]

According to Wikipedia Trek holds two of the several suspension frame designs, and uses them both (combined) on their mountain bikes. The technologies are EVO link and Full Floater, being claimed to ...
5
votes
3answers
511 views

Is my derailleur hanger too bent?

I bent the derailleur hanger on my 9spd cassetted 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 a doozy with ...
5
votes
1answer
453 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 ...
15
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3answers
8k 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 ...
2
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2answers
120 views

I am having trouble identifying the manufacturer of this bike

What brand is this logo? Can anyone identify this?
1
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1answer
245 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
5
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1answer
133 views

Why would higher fork contribute significantly to breaking the frame?

When I recently cracked my frame near the headtube, every bike shop that I went to, asked me explicitly "Did you put a longer travel fork?". Putting aside that apparently fork travel and fork crown ...