50/50 Road/eBike Commuter
Join Date: May 2007
Location: Valparaiso, IN
Bikes: Specialized Roubaix, Specialized Sirrus, Brompton
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Read up on this:
Determine your pedal axle diameter first.
Most pedals are 9/16". The threads can be "chased" with a pedal tap. I have these: http://parktool.com/products/detail....=27&item=TAP-6
But if the threads are as trashed as you say using a tap is probably a lost cause. Someone makes an insert that you can install in the crank to "replace" the damaged female threads, but I've never used one:
I reckon you'd need a drill and a different tap to cut the larger threads for an insert like this.
Make certain you check the threads on your pedal too. Those can also be refinished, with a die. I bought a left-hand die (and the aforementioned tap set) specifically for this purpose (pedal came out on my niece's bike, and the threads on both parts were both slightly damaged but repairable). These cutting tools are expensive so I would check to see if a local shop has them first. That's what I should have done, in retrospect. It's not like they're commonly-used tools for the home mechanic.
Remember that each side of the bike has a different thread direction and so needs a different cutting tool.
Might be a good idea to take the other pedal out and check the threads on that side as well?
Does anyone know how these threads get damaged like this? I'm curious.
Last edited by kmcrawford111; 02-16-10 at 04:23 AM.