Pedal threads
Pedal threads
People, the next chapter of my restoration learning journey is that the lovely Stronglight chainset a kindly forum member sold me, requires 14 x 1.25 threded pedals, not the now standard 9/16. Doing some research, it appears that such pedals are rare and that tapping the crank threads out to 9/16 would be the way forward.
Well that's fine except tapping is something I've yet to try, Indeed I don't have the tools. Is this an easy task or would I be better off paying someone to do it for me?
Thank you.
Robert.
Well that's fine except tapping is something I've yet to try, Indeed I don't have the tools. Is this an easy task or would I be better off paying someone to do it for me?
Thank you.
Robert.
Re: Pedal threads
You could buy a pair of taps from around £20 and you shouldn't have any difficulty using them. However as you are not likely to have much use for them again it might make more sense to get a local bike shop to run their taps through the cranks.
Re: Pedal threads
I've just done my first tapping on the notorious tandem trailer trike.
Exactly, unless you think you'll be using them again.
Jonathan
iandusud wrote:You could buy a pair of taps from around £20 and you shouldn't have any difficulty using them. However as you are not likely to have much use for them again it might make more sense to get a local bike shop to run their taps through the cranks.
Exactly, unless you think you'll be using them again.
Jonathan
Re: Pedal threads
Do you have any ideas how much that would cost? Does not appear to be a big job.
Re: Pedal threads
You’ve presumably read Sheldon Brown?
Older French bicycles used a 14 mm x 1.25 mm thread, but these are quite rare. French-threaded pedals are commonly labeled "D" and G" (French for "droite" and "gauche" (right and left). A French pedal will start to thread into a 9/16 x 20 crank (and vice versa), but will soon bind. Do not force it, or it will damage the crank. Aluminum French cranks are easily rethreaded to 9/16" x 20 TPI.
From my experience of trying to re-tap a damaged crank thread for a helicoil, you’ve got to get or keep the 90 degree angle spot on, or you will get that queasy feeling that something is “off”.
Older French bicycles used a 14 mm x 1.25 mm thread, but these are quite rare. French-threaded pedals are commonly labeled "D" and G" (French for "droite" and "gauche" (right and left). A French pedal will start to thread into a 9/16 x 20 crank (and vice versa), but will soon bind. Do not force it, or it will damage the crank. Aluminum French cranks are easily rethreaded to 9/16" x 20 TPI.
From my experience of trying to re-tap a damaged crank thread for a helicoil, you’ve got to get or keep the 90 degree angle spot on, or you will get that queasy feeling that something is “off”.
Spa Audax Ti Ultegra; Genesis Equilibrium 853; Raleigh Record Ace 1983; “Raleigh Competition”, “Raleigh Gran Sport 1982”; “Allegro Special”, Bob Jackson tourer, Ridley alu step-through with Swytch front wheel; gravel bike from an MB Dronfield 531 frame.
Re: Pedal threads
They are marked 14 1.25 on the back.
Re: Pedal threads
it is possible that the cranks have already been retapped to BSC; have you tried a pedal in them?
BTW retapping is, in this case, a five minute job.
cheers
BTW retapping is, in this case, a five minute job.
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
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Re: Pedal threads
I should be afraid of damaging the thread so the cranks could no longer be used
Entertainer, juvenile, curmudgeon, PoB, 30120
Cycling-of course, but it is far better on a Gillott
We love safety cameras, we hate bullies
Cycling-of course, but it is far better on a Gillott
We love safety cameras, we hate bullies
Re: Pedal threads
I tried a new pedal, but they bound quite quickly, so stopped.
Re: Pedal threads
you need the thread retapped, French pedals or different cranks then.
cheers
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
Re: Pedal threads
I've found someone to retap the threads. A bike shop I won't name wanted to drill a larger hope and glue in an insert with a 9/16 thread! Thanks but no thanks I said. The guy told me that this what he does for cranks with damaged/stripped threads.
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Re: Pedal threads
robert17 wrote:I've found someone to retap the threads. A bike shop I won't name wanted to drill a larger hope and glue in an insert with a 9/16 thread! Thanks but no thanks I said. The guy told me that this what he does for cranks with damaged/stripped threads.
It's not a shameful suggestion and such inserts are a common repair for damaged threads in cranks and all sorts of other parts and devices. Threadlocking agents are essentially specialist glues.
Re: Pedal threads
Yes, I agree.Brucey wrote:you need the thread retapped, French pedals or different cranks then.
Cheapest option is to buy French pedals perhaps.
They must have all the same pedals as the rest of us, just different spindles.
Mick F. Cornwall
Re: Pedal threads
alexnharvey wrote:robert17 wrote:I've found someone to retap the threads. A bike shop I won't name wanted to drill a larger hope and glue in an insert with a 9/16 thread! Thanks but no thanks I said. The guy told me that this what he does for cranks with damaged/stripped threads.
It's not a shameful suggestion....
I agree, but it is a pointless one.
FWIW I think I have a set of French-threaded (vintage) pedals here.
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
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Re: Pedal threads
Mick F wrote:Yes, I agree.Brucey wrote:you need the thread retapped, French pedals or different cranks then.
Cheapest option is to buy French pedals perhaps.
They must have all the same pedals as the rest of us, just different spindles.
No they have Frogs Feet - so quite different
Not intended to be offensive, I'll add