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Bicycle crank repair

General welding questions that dont fit in TIG, MIG, Stick, or Certification etc.

Re: Bicycle crank repair

Postby exnailpounder » Sat Mar 04, 2017 9:47 am

AndersK wrote:
exnailpounder wrote:The left side has reverse threads :lol:

Yeah, I got it wrong. Stand corrected in shame :oops: :lol:

I haven't worked on a bicycle since I was a kid so I have no idea what the hell I am talking about :lol:
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Re: Bicycle crank repair

Postby tonij » Mon Mar 06, 2017 8:16 am

Lots of cranks these days are 7075 alloy...
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Re: Bicycle crank repair

Postby paul_s » Fri Apr 14, 2017 2:14 pm

Thanks everyone for your replies to this thread. I wound up returning the bike to my neighbor. It was going to be a free job and I prefer not to do jobs if I can't do them right. Finding and sourcing tools and supplies turned out to be too expensive, and my neighbor did not want me spending too much on this. Getting new cranks seems the way to go for around $50 and I'll let my neighbor decide if he wants to spend the money.
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Re: Bicycle crank repair

Postby Olivero » Fri Apr 14, 2017 6:23 pm

Well, that's all fair and square I guess but when it comes to rethreading stuff by welding it back up and then retapping it, I have used pretty much any alloy I have on the shelf, I pick the "stronger" one of what I got and usually that does the trick, never worried about the alloy too much.
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Re: Bicycle crank repair

Postby Otto Nobedder » Fri Apr 14, 2017 7:26 pm

tonij wrote:Lots of cranks these days are 7075 alloy...

Lots of cranks these days vent their frustrations on facebook.


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