Crank problem

Problem:

Upon removing the old pedal from my crank, unfortunately the thread came with it. Not sure why/how but it did. Anyways, it was the crank attached to the chainring.

So I assume I need to buy a new crank, and a new chainring? Are the two attached? I have no idea but assume so.

Secondly, if I am buying a new crank/chainring combo, what size do I need? I know the best thing to do is go to a bike shop, but I'm short of beans and need to do it on the cheap. So was going to get summat of ebay/here if anyone has an old cheap one and then ask to borrow tools/knowledge to remove the old one and fit the new one.

Tips for the best way to proceed are much appreciated...

what crank is it?

piccie??

No idea. Picture shall be taken now...

picture.. Is this the picture you had in mind?

1 Attachment

i have a double chainring crank that i am never going to do anything with. you can have it. its not pretty but it will get you mobil and for sure do until something else comes along at the right price. the length you would need is likely to be 170mm.
just let me know and i will drop it around this evening,,,,, along with your bars.

which thread is it that came off? the one where the pedal attaches to the crank arm?

Yea - the one where the pedal attaches. So the pedal is loose when it is screwed in.

i have a double chainring crank that i am never going to do anything with. you can have it. its not pretty but it will get you mobil and for sure do until something else comes along at the right price. the length you would need is likely to be 170mm.
just let me know and i will drop it around this evening,,,,, along with your bars.

Thanks that is awesome. PM'ed

If the thread has gone from the crank arms then you are fubar

If its drive side it will cost you, if not ring around a few bike shops to see if they have non-drive side crank arms at the length and colour you are after.
They might not match but they will be hip! (get them the same length and BB fitting)

It could have happened if the pedal was cross threaded or not tightly secured - the movement and force you exert cycling grinds away the thread

You just need to get the thread in the crank 'helicoiled' - basically involves drilling it out oversize, tapping a new thread, then fitting a special insert that takes it back down to the original size. A decent LBS should be able to do it, search the forum for helicoil or some such, it's been mentioned before and someone got it done free or at least very cheaply.

Wow. Just read through the old posts, and that was amazingly helpful. Will no doubt save a lot of hassle if I can get that done. Off to cycle surgery tomorrow then...

Get some anti-seize grease as well, for the next pedals you fit. It's got copper in it.

You just need to get the thread in the crank 'helicoiled' - basically involves drilling it out oversize, tapping a new thread, then fitting a special insert that takes it back down to the original size. A decent LBS should be able to do it, search the forum for helicoil or some such, it's been mentioned before and someone got it done free or at least very cheaply.

I hate throwing away useable or repairable stuff as much as the next man - no, I would say I probably hate it more - but surely that's more trouble than it's worth and only worth bothering with if the cranks were very high quality, which it doesn't look as though they are.

Indeed. Just hacksaw a cut through the crank arm where shown in the below pic, then whack a blunt chisel in the cut until the arm splits open.

I hate throwing away useable or repairable stuff as much as the next man - no, I would say I probably hate it more - but surely that's more trouble than it's worth and only worth bothering with if the cranks were very high quality, which it doesn't look as though they are.

But if I could get it done cheap, then it would be worth it...

Indeed. Just hacksaw a cut through the crank arm where shown in the below pic, then whack a blunt chisel in the cut until the arm splits open.

How would this help? Not meaning to sound aggressive, which reading it is how it sounds.... Meant as a genuine, "I don't understand"

I think he miss-interpreted the problem

Stallion,

Did you get all the info you needed? If you wan to show it to someone who can talk through with you what to do why not come to the Hackney Bike Workshop next on is this coming Tuesday detals at the Hackney Cyclists web site.

From the details given I would say you might have tried (and suceeded) to undo the pedals the wrong way one side the pedals are clockwise and the other anticlockwise. If the tread is gone then there is not a lot you can do also the crank pictured is a cheap one probably off a Dutch sit up and beg so is it worth putting a lot of effort into it when a new one would probably cost you about £15.
All the best

Zebra