3

I bought a second hand boardman cb pro mountain bike. It came with no pedals (as expected) but the guy gave me some 1/2 inch screw pedals, flat basic ones.

But they don't fit. The screw diameter is way too small for the thread on (I believe you call it a crank).

The crank is shimano Fc-m542.

The bike is relatively modern. (within 5 years, at a guess).

Is there a specific size pedal I need to look for so it fits tge thread / hole?

7

Normally, one piece cranksets use 1/2" x 20 tpi pedals. Three piece cranksets use 9/16" x 20 tpi pedals. Old french cranksets use something else.

You find one piece cranksets on old American bicycles or some very low quality bicycles (such as those you'd get from Walmart). Almost all other bicycles use three piece cranksets.

So, you need a 9/16" pedal. Remember to grease the threads before installing the pedal and the left side pedal is counter-threaded (tightens counter clockwise) while the right side pedal is threaded normally (tightens clockwise).

1
  • 2
    RE the thread direction: hold the pedal axle still, turning the cranks backwards does them up (for both sides, – Holloway Oct 29 '16 at 14:54
4

This is pedantic, but the actual answer to the question is decisively no, because of Dyna Drive. enter image description here

2
  • Also older Shimano cranksets may have French threading: M14x1 - I have a S.600 crankset with this threading. However the OP was talking about the last 5 years and French threads disappeared in the 1980s – DavidG Oct 30 '16 at 15:12
  • 1
    To be clear though, the specific crankset OP has ( Fc-m542) takes a 9/16" pedal. – Batman Oct 30 '16 at 17:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.