Technical & Reference Section > Tech and Restoration

9/16 thread size tap needed

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trasher:
heres my problem ,,,,,i got some nos painted bullseye cranks ,,

im going to get them striped and chromed ,,,so i thought id try some pedals on them first ,the threads are tight as a nuns c4nt

there was paint finish in the threads so i paint striped the threads ,,,i tried some skyway pedals in them ,,no joy ,,,,some repo hutch pedals ,no joy
some xcII's,, no joy ,,they seem to go in a couple of mm but totally tighten up

some cheapo vectors ,,,bingo ,,but i dont want to fit these into them ,,,but the maxycross cranks these came out of also take the other pedals i tried in the bullseyes   :-\

so the point im trying to get to is ,,,are there different types of 9'16 threads ie 26tpi,,unc,,bsf  :-\

im thinking of re taping them  :P

harris:
helicoil them

trasher:

--- Quote from: harris on March 02, 2010, 08:19 PM ---helicoil them

--- End quote ---

arn't helicoils ,for when the threads are fooked ,,,,

Gary72:

--- Quote from: harris on March 02, 2010, 08:19 PM ---helicoil them

--- End quote ---
Dont think you would get away with it. Unless you wanted to use 1/2 pedals. When I've used helicoils in the past you have to make the hole bigger to accept the coil. So you would probably have to drill out the original thread to re-cut a new thread for the coil.
I would try running a tap down the thread. Although a left handed tap might be difficult to track down.

harris:
my miss reading  i thought they was pooped  a bike company in kent sells all the taps you will need
cant find the name.

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