Hot answers tagged

32 votes

How does brazing and welding not ruin the heat treat on steel tubes?

tl;dr heating chromoly to brass-brazing temperature doesn't really change it, at all; the steel was born hot and heating it back up does nothing to it other than oxidizing the surface if you don't ...
user avatar
  • 3,147
22 votes

What's the strongest way to bond a cable stop to an steel frame?

Don't use cable stops. The biggest load those stops will ever see is when you grab your brakes hard for an emergency stop. So you're likely to find out that whatever you did to bond the stops to the ...
user avatar
  • 8,783
18 votes
Accepted

What are the most basic parts of a bicycle which cannot be upgraded over a period of time?

Certain parts of a bicycle are more easily upgradeable than others, while other types of upgrades require special tools, much more money investments or are limited to whatever standards are used in ...
user avatar
17 votes

What's the strongest way to bond a cable stop to an steel frame?

Beside a professionally done welding, clamp-on cable stops should be a reasonably reliable solution.
user avatar
15 votes
Accepted

Bike with a hi-ten steel frame for getting around the city?

I have 4 bikes, and the one I keep for just riding around a city is high-ten steel. Yes, they're heavy, and normally cheap, but they can be tough and practical. What's more important is that it works ...
user avatar
  • 46.2k
14 votes
Accepted

Frame with bottle cage boss ripped out - how serious is the damage?

You'll need to very carefully inspect the area around the boss that's been ripped out, as well as your usual second hand frame check. If the bike was ridden after the damage cracks could easily have ...
user avatar
  • 23k
14 votes

What are the most basic parts of a bicycle which cannot be upgraded over a period of time?

Any and every part of a bicycle can be replaced, including the frame. (Many people would probably regard a different frame as a different bicycle though.) You ask whether there are components that '...
user avatar
11 votes

How to keep a huge cargo bike safe in the city?

I'm answering my own question because I took a combination of the steps above, plus some other steps. I took steps to make getting it back in event of theft more likely: registered the bike with ...
user avatar
  • 411
11 votes
Accepted

Cracked frame riding into the back of car, what's salvageable?

I've worked on a couple bikes that have had frontal impacts. Check the underside of the downtube for any abrasions or rubber marks. You might find the front tyre has touched the downtube in the ...
user avatar
  • 99.1k
11 votes
Accepted

Fixed gear steel frame from AliExpress

No, it is not serious, you should not believe these descriptions. They just try to attract people searching various terms. There are indeed many counterfeits in these shops. When they claim so much ...
user avatar
10 votes

Cracked chainstay weld -- now what?

Get in touch with Surly even if it out of warranty. The worst they can do is say no, and even if they won't fix it, they should be able to offer advise on the the best way to proceed. They live or die ...
user avatar
  • 40k
10 votes
Accepted

What is the function of these 'bulges' on the frame?

My best guess is that you have a frame made of Gilco Design Columbus tubing used on Italian bikes in the 80s. I could find no mention of Oberriet bike brand anywhere. Maybe a small custom frame ...
user avatar
  • 16.3k
10 votes
Accepted

Will grooves on seatpost cause rusting inside frame?

The best thing to do is apply a thin layer of grease to the inside of the seat tube and the outside of the post (only the part of the post inside the seat tube needs grease) and set the seat height ...
user avatar
  • 16.3k
10 votes

My chainstays have been eaten by rust, can something be done?

The only thing that can be done to save the frame is to have patches welded over the holes. You would need the expertise of a professional welder to get it done properly so that the frame is made ...
user avatar
9 votes

Bike with a hi-ten steel frame for getting around the city?

High tensile or 'hi-ten' steel is the lowest end material used for inexpensive bikes. The next level up is so called 'cro-moly' steel (alloys using chromium and molybdenum). High tensile steel frames ...
user avatar
9 votes
Accepted

Can this frame be used or is it done?

If it were mine I wouldn't ride. It appears there is a crack connecting the two holes. This would indicate there has been enough flex to cause the frame to crack.
user avatar
  • 18k
9 votes

Fixed gear steel frame from AliExpress

Personally, I would suggest you look locally for a used bike for your project. You don't need a brand new bike and that bare-frame is not exactly cheap. Also notice that you'll need to paint the bike ...
user avatar
  • 99.1k
9 votes
Accepted

Slightly bent seat stays. Should I worry about it?

Most likely this is normal design. Although more common in aluminum than in steel, tubes that don't run straight are common. Since both sides are a same, the only possibility this is caused by an ...
user avatar
  • 12.4k
8 votes

Steel vs. Aluminum Wheels

Others have answered the second part "what are the differences..." Here's an answer for the first part "why not many at the dump" In in my city 2015 light grade clean steel is worth $0.02/kg. ...
user avatar
  • 99.1k
8 votes

What can I do about a cracked frame?

I am going to get beat up for this but steel frames don't fail catastrophically. Pull that post. If the end of the post is in the middle of the crack then look for a longer post. Get a seat post ...
user avatar
  • 15.4k
8 votes

My chainstays have been eaten by rust, can something be done?

To be clear, I would not recommend riding that frame as-is. The clamps of the kickstand probably added rigidity, by removing it the bike will be weaker. If one or both chainstays part then handling ...
user avatar
  • 99.1k
7 votes
Accepted

Is it safe to ride a steel bike with a dented/buckled frame?

All steel frames of any age get a few dings from serious use. The failure point for steel frames is usually the highest stress points: the joins. That is why we used to have fancy tubing sets likes ...
user avatar
  • 17.1k
7 votes

What can I do about a cracked frame?

It's hard to tell from the photo ( is that large vertical streak said crack? ), but if your frame is cracked, don't use it. Riding on a cracked frame is risky as it could result in a catastrophic ...
user avatar
7 votes

Steel (531) road bike conversion to disc practicability

Answer: Its not worth doing, from a financial stand point. Adding disk brakes to a frame is expensive, risky, and ruins any vintage value the frame had. The stays are not engineered or designed for ...
user avatar
  • 99.1k
7 votes

Cracked chainstay weld -- now what?

Just getting it welded by a non-framebuilder could have a couple caveats: I think most framebuilders would approach this in a way where they get full access to the broken face of the dropout, so they ...
user avatar
7 votes
Accepted

Are dimpled chainstays weaker than smooth ones, other things equal?

The dimpled chainstay may have less stiffness in certain directions at that point, but if forces are not concentrated there, or in the direction of less stiffness it just doesn't matter. A u-shaped ...
user avatar
7 votes
Accepted

132.5mm dropout spacing with a 130mm hub AFTER it has already been used with a 135mm hub

Short answer: Don't worry about it! Steel is inherently a springy material and you will find the dropouts spring back to their original location once the wheel is removed. In order to permanently re-...
user avatar
  • 9,584
6 votes

Aluminum seatpost stuck to a steel frame

Eventually got an aluminium seat-post out of an old steel Peugeot road-bike frame. It had been in for a couple of decades, never moved and was completely 'welded' in place. Tried penetrating oil, ...
user avatar
  • 61
6 votes
Accepted

Can I use titanium axle bolts on a steel frame?

Presumably you're talking about a Profile or one of the other BMX hubs with ti hop-up bolts available. Yes, there is no issue. Were a bolt loose and able to rub dynamically against the frame, they ...
user avatar
6 votes

Can this bent (after crash) rigid steel fork get repaired?

The quick answer is NO, you can't bend back the fork. Or at least not at a reasonable price. Your bike looks right knackered. You could maybe find a used fork off a donor bike for free or cheap at a ...
user avatar
  • 28.5k

Only top scored, non community-wiki answers of a minimum length are eligible