Chainset/crank arm question

torch1

Right got the missus a new bike, nothing flashy.

It would appear that I didn't tighten one of the pedals well enough (although I was sure I did) because on her second ride out it worked it's way loose until it got to the last 3 threads which then gave way as she was stood up pedalling. As you can imagine, it wasn't pretty and I'm not exactly popular. :oops:

So the pedal is knackered because the threads are bent and it looks the threads on the crank arm might be too. The crank arm and chainset seem to be a one piece job so will need to be replaced. I think it might be the older square taper design (as apposed to splined). Haven't checked yet though.

Is it a simple case of undoing a hex screw and pulling the chainset off then replacing? Does the bottom bracket need to be removed? If so do I need any special tools?

As far as I can work out with the square taper design any brand will fit as they are all the same size square holes, I just to need ensure that the chainset has the same number of teeth and the crank arms are a similar length? Correct or no?

Any others tips welcome.

Thanks

nicklouse

http://www.parktool.com/blog/repair-hel ... nk-service

you may be able to get the threads sorted with an insert.

not all cranks work on the same BBs as many need different length axles.

torch1

I thought I was making it too simple in my head. Great link thank you.

Can you shed any more light on getting the threads sorted with an insert? How would that work?

Thanks for your help.

nicklouse

take it to your LBS and they can do it. (if they have the kit).

torch1

Sounds a wise idea.

Cheers

nwmlarge

i thought all pedals were threaded so they'd do themselves up in use!
hope her legs alright