Do most pedals fit most cranks?

"Pat O'Neil" <[email hidden]> wrote in message
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Quoted message said:

I recently did a fixed-gear conversion on a '77 Raleigh Grand Prix. I

removed

Quoted message said:

the original pedals and started to install a set of new ones. The fit

seemed

Quoted message said:

very tight. I didn't force it. The original pedals go on and off easily. Am I going to have to
replace the cranks in order to upgrade the pedals?

Pedals have been the same for ages. The only ones I've ever really seen that were different are French-
thread pedals, which are ever so slightly larger than the usual 9/16" pedals. If anything, any new
pedal should be looser. However, not forcing the issue was probably smart. I believe most pedals are
9/16"x20tpi but could be wrong. See if you can tell what pedals and what cranks you have. I strongly
suspect the pedals are this thread (if they fairly recent..), however, an old English crank may be
different. You can try comparing the thread pitch of the two pedals (old and new) by placing the
threaded portion side by side in contact. They should mesh perfectly. If not, they're different
pitch. I cannot remember what the French thread specification was/is. Oh, and just in case, one
pedal is left handed thread and one is right.

Cheers,

Scott..

pj-<< I recently did a fixed-gear conversion on a '77 Raleigh Grand Prix. I removed the original
pedals and started to install a set of new ones. The fit seemed very tight. I didn't force it.

Quoted message said:

Quoted message said:

<BR><BR>

Have a bike shop run taps thru the crank pedal holes. Not uncommon for them to feel tight with new
pedals. They are the same threading, just need to be 'cleaned' up a bit.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
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"S. Anderson" <[email hidden]> wrote in message
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Quoted message said:

Pedals have been the same for ages. The only ones I've ever really seen that were different are
French-thread pedals, which are ever so slightly larger than the usual 9/16" pedals. If anything,
any new pedal should be looser.

Just to clarify, if the crank is French thread then any new 9/16" pedal would feel loose in a French
crank if anything. Peter is probably right, just a little tight but probably the same thread.

Cheers,

Scott..

A well-intentioned said:

Quoted message said:

Pedals have been the same for ages. The only ones I've ever really seen that were different are
French-thread pedals, which are ever so slightly larger than the usual 9/16" pedals. If anything,
any new pedal should be looser.

Nope. If you do the math, 9/16" is 14.29 mm. French Pedal threading is 14 mm x 1.25 mm thread.

Thus, French pedal threading is _smaller_ than ISO standard. If you try to fit an ISO standard pedal
into an old French-threaded crank, it won't go in.

However, if you are stuck with old French cranks, you can re-tap them to ISO size (9/16 " x 20 tpi.)

The French 1.25 mm thread pitch works out to 20.32 threads per inch, which is close enough to not be
a problem in practice.

The other pedal standard is 1/2" x 20 tpi, mainly used on bikes with one-piece cranks.

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"Sheldon Brown" <[email hidden]> wrote in message
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Quoted message said:

Nope. If you do the math, 9/16" is 14.29 mm. French Pedal threading is 14 mm x 1.25 mm thread.

Damn!! Right you are Sheldon. Never mind..I'm going back into hibernation...

Cheers,

Scott..

Quoted message said:

"Pat O'Neil" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I recently did a fixed-gear conversion on a '77 Raleigh Grand Prix. I

removed

Quoted message said:

the original pedals and started to install a set of new ones. The fit

seemed

Quoted message said:

very tight. I didn't force it. The original pedals go on and off easily. Am I going to have to
replace the cranks in order to upgrade the pedals?

S. Anderson said:

Pedals have been the same for ages. The only ones I've ever really seen that were different are
French-thread pedals, which are ever so slightly larger than the usual 9/16" pedals. If anything,
any new pedal should be looser. However, not forcing the issue was probably smart. I believe most
pedals are 9/16"x20tpi but could be wrong. See if you can tell what pedals and what cranks you
have. I strongly suspect the pedals are this thread (if they fairly recent..), however, an old
English crank may be different. You can try comparing the thread pitch of the two pedals (old and
new) by placing the threaded portion side by side in contact. They should mesh perfectly. If not,
they're different pitch. I cannot remember what the French thread specification was/is. Oh, and
just in case, one pedal is left handed thread and one is right.

14mm pedals were not larger. 9/16 is 14.2875mm 14mm cranks can be easily tapped out to 9/16. (None
of that is relevant to his Raleigh)

Didi you oil or grease the threads?

--
Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971