Crank threading
03-23-11 | 08:05 PM
#1
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Crank threading
I have a set of Stronglight 93's (I think) that are M14x1.25 threading. I also have 2 sets of TA cranks that I believe (normal pedals don't thread in more than 2 turns) are French threaded as well. I installed the Stronglights on my Astra w/out issue. I then went to install my French threaded pedals (2 different sets) and got about 2 turns into the Stronglights then got really tight. The threads look unbutchered and clean so that shouldn't be an issue. I tried the same pedal in both sets of TA cranks w/out issue. What gives?!?
I really want to get this bike together and ride it. I could use another set of Stronglight 93s that I have but they are not polished like the ones on the bike and I don't feel like polishing anything....
I really want to get this bike together and ride it. I could use another set of Stronglight 93s that I have but they are not polished like the ones on the bike and I don't feel like polishing anything....
03-23-11 | 08:20 PM
#2
Senior Member
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From: Detroit
9/16x20 crank with French pedals = too loose
French crank with 9/16x20 pedals = too tight
What makes you think your pedals are French? - or for that matter that your TA cranks aren't 9/16"?
French Pedals are usually marked "G" and "D".
French crank with 9/16x20 pedals = too tight
What makes you think your pedals are French? - or for that matter that your TA cranks aren't 9/16"?
French Pedals are usually marked "G" and "D".
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03-23-11 | 08:29 PM
#4
feros ferio
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From: www.ci.encinitas.ca.us
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
Your TAs may have been retapped to ISO.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
03-24-11 | 07:17 AM
#5
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The only reason I thought the pedals are French is because 9/16" pedals do not thread into my TA cranks (either set) and the "French" pedals do. I'm going to take a crank arm to a place that sells taps and dies along w/ a "French" pedal and see what threading they are. If it comes down to it, I'll just retap them to 9/16" threads
03-24-11 | 07:22 AM
#6
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If it comes down to it, I'll just retap them to 9/16" threads
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03-24-11 | 07:56 AM
#7
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03-24-11 | 08:13 AM
#8
PanGalacticGargleBlaster
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If you haven't been able to thread any pedals into the Stronglights perhaps the threads are gunked up. You can chase em with the right tap, or just hose em out with WD-40 and a paper towel real good and lube em and try again.
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03-24-11 | 08:22 AM
#9
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They look pretty clean, plus I don't have a M14x1.25 tap. I have 30-40 taps, just not that one!
Just to clarify, if I thread French pedals into ISO (9/16x20) threads, they will be loose? I threaded the Lyotards (the pedals I want to use) into a set of cheap Shimano mtb cranks and they were loose but, did snug down.
Just to clarify, if I thread French pedals into ISO (9/16x20) threads, they will be loose? I threaded the Lyotards (the pedals I want to use) into a set of cheap Shimano mtb cranks and they were loose but, did snug down.
03-24-11 | 09:04 AM
#10
PanGalacticGargleBlaster
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From: Smugglers Notch, Vermont
Bikes: Upright and Recumbent....too many to list, mostly Vintage.
I threaded the Lyotards (the pedals I want to use) into a set of cheap Shimano mtb cranks and they were loose but, did snug down.
Silly question...did you grease the threads?
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03-24-11 | 09:04 AM
#11
Old fart
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From: Appleton WI
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The only reason I thought the pedals are French is because 9/16" pedals do not thread into my TA cranks (either set) and the "French" pedals do. I'm going to take a crank arm to a place that sells taps and dies along w/ a "French" pedal and see what threading they are. If it comes down to it, I'll just retap them to 9/16" threads
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