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Old 11-18-10, 06:51 PM   #1
Zaphod Beeblebrox 
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Cottered TA crankset question

Does a Cottered TA crankset use the same size BB spindle as a cottered Nervar Crankset?

The Spindle in question is on my '72 Raleigh Super Course, I'm considering a Cottered TA crankset. Because I think it looks awesomer than the square taper ones.



The fact that it won't need the stupid special size puller is kinda cool too.
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Old 11-18-10, 07:34 PM   #2
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I don't think I've ever seen a cottered TA crankset, only Stronglight. Do you have a pic?

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Old 11-18-10, 08:51 PM   #3
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Isn't there a guy with a website that covers TA really in depth?
The only "cottered: TA I can find any reference to requires a TA BB;
http://www.classiclightweights.co.uk...anks-comp.html
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Old 11-18-10, 08:56 PM   #4
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I didn't look close enough. Its Nervar with TA rings. Sorry!
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Old 11-18-10, 10:01 PM   #5
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I have seen two sizes of Nervars. I think it's 5/8" for English and 15mm for French bikes or something like that. I think the Japanese use the same size as the French but they tend to be the cheap kind.
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Old 11-18-10, 10:18 PM   #6
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Originally Posted by nlerner View Post
I don't think I've ever seen a cottered TA crankset, only Stronglight. Do you have a pic?

Neal
TA cottered cranks had a unique spindle, kind of half-round, half-square:
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Old 11-19-10, 06:57 AM   #7
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^Would you believe I had a pair of those, which I gave away to a guy who worked at the lbs about fifteen years ago. What was I thinking.
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Old 11-19-10, 07:19 AM   #8
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I have seen two sizes of Nervars. I think it's 5/8" for English and 15mm for French bikes or something like that. I think the Japanese use the same size as the French but they tend to be the cheap kind.
First of all, be sure to measure the overall length of the axle to ensure a correct fit. And then...

Here are some of the rather confusing variables available on old Nervar crank arms which you should also be concerned with.

This is a detail of a 1974 catalog page which was scanned by enthusiast Robert S Broderick. By this point in time, cottered steel cranks were really on their way out in favor of a growing number of inexpensive alloy cotterless cranks. But, Nervar was still producing a wide variety of cranksets in their earlier patterns. With the variations shown in the image below, you could find a very inexpensive replacement crankset to match any of your existing bottom bracket or pedal thread needs. - But, that was then...

Best to accurately measure the diameter of the end of a BB axle. A 5/8" (British standard) axle = 15.88 mm. It will fit into a French diameter opening... but just a bit loosely. A 16 mm (French) axle will not fit into a British crank opening. Also, proper British dimensioned cotter pin [3/8"= 9.5 mm] will not fit into the smaller bore of a French crank arm. To be honest, I've never tested a mis-matched fit, but you might have an issue when combining the two sizes... the tapers may be a bit off and so with such a combination the cotter pin could prove too loose a fit to anchor the smaller axle properly... But, maybe it's no big deal at all.

In any case, Good Luck! Cottered axles are becoming very hard to find - just in a correct required length!

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Old 11-19-10, 07:33 AM   #9
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Isn't there a guy with a website that covers TA really in depth?
Probably Joel Metz's pages?

http://www.blackbirdsf.org/ta/

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Old 11-19-10, 08:44 AM   #10
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I didn't look close enough. Its Nervar with TA rings. Sorry!
Newb.
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Old 11-19-10, 09:09 AM   #11
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Newb.



I've got nothing witty to retort with. I'm fresh out this morning for some reason.
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Old 11-19-10, 09:36 AM   #12
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I'm fresh out this morning for some reason.
that's what she said?
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Old 11-19-10, 10:22 AM   #13
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that's what she said?
sadly, no....it was the reply to what she asked.
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Old 11-19-10, 06:38 PM   #14
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Probably Joel Metz's pages?

http://www.blackbirdsf.org/ta/

Neal
Yeah, that guy.
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