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TA Compatibility

Old 12-17-11, 05:14 PM
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sisddwg
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TA Compatibility

TA bottom bracket cups; TA Pro 5 VIS crank arms; JIS spingle. Will this spindle work satisfactorily with the TA cups? Thanks.
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Old 12-17-11, 05:31 PM
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French spindles typically use the same style spindles Italian spindles use (same distance between spindle race ridges). I don't know the taper required for TA cranks though.
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Old 12-17-11, 10:46 PM
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The spindle may work with the cups, but T.A. cranks are not made for a JIS taper. It still may work, but the arms will sit farther out.
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Old 12-18-11, 06:27 AM
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Peter White gives a good essay on TA BB fitments. Some seem to have been TA, others JIS, others ISO. He sells TA BBs as well as many others. www.peterwhitecycles.com.
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Old 12-18-11, 08:52 AM
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I don't think Peter White's going to be much help; he only sells the newer TA cranks, not the Pro 5 vis, which he doesn't like. Far better to communicate with Jan Heine at Compass Cycles (the retail wing of his Bicycle Quarterly empire) or Mike Kone at Rene Herse/Boulder Bicycle, both of whom sell, like, and use the Pro 5 vis.

Peter White does mention on one page that TA changed from ISO to JIS for the new millenium, but that's no help to someone who has an older Pro 5 vis crank. Stronglight and TA bottom brackets from the vintage era are pretty much interchangeable, if that helps. As Grand Bois pointed out JIS will probably work, but the spindle length is going to be a question mark, since you'll probably need a shorter spindle in JIS than the original one. Also, lots of the JIS stuff available (cartridge BBs) have symmetrical spindles, while I believe that TA and Stronglight used slightly asymmetrical ones (right side longer). That works the opposite direction from "JIS spindle ends are stubbier" in the "what spindle length will work?" department.

Last edited by Charles Wahl; 12-18-11 at 09:05 AM.
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Old 12-18-11, 09:45 AM
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Under $15 for the correct spindle? I say go that route.

Otherwise I'd try a JIS spindle 2-3mm shorter than the required length.
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Old 12-18-11, 10:28 AM
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Originally Posted by ColonelJLloyd View Post
Under $15 for the correct spindle? I say go that route.

Otherwise I'd try a JIS spindle 2-3mm shorter than the required length.
That's a fantastic price for a NOS French spindle. Thanks for the link, I'm stocking up!

I'm not an expert on non-French spindles with French cups, but I do know that TA cranks with ISO tapers will work just fine with JIS spindles. As Grand Bois pointed out, the arms will stick out a little farther on a JIS spindle, to the tune of about 2-3mm per arm. I'm running a set of TA arms on a 115mm JIS spindle. By comparison, I also have a set of TA arms on a 118mm French (ISO) spindle. The Q factor on the ISO spindle/arms is 2mm less than on the JIS spindle/arms. So, by my calculations, the JIS taper causes each arm to sit out 3mm further than on an ISO taper. So, I would suggest going with a JIS spindle that's about 5-6 mm shorter than the equivalent ISO spindle to maintain Q factor and chainline. Of course, tapers vary from lot to lot, and also wear a bit from repeated crank extractions, causing changes in how far out the arms sit. So, YMMV.
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Old 12-18-11, 04:56 PM
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I once acquired a Zieleman that had a 49D set fitted icw Sugino BB. The previous owner (or his mechanic) neatly construated a thin brass plate shim to make it work. This was done for the driveside only. I wouldn't consider it an ideal solution however.
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Old 12-18-11, 08:48 PM
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Originally Posted by Charles Wahl View Post
I don't think Peter White's going to be much help; he only sells the newer TA cranks, not the Pro 5 vis, which he doesn't like. Far better to communicate with Jan Heine at Compass Cycles (the retail wing of his Bicycle Quarterly empire) or Mike Kone at Rene Herse/Boulder Bicycle, both of whom sell, like, and use the Pro 5 vis.

Peter White does mention on one page that TA changed from ISO to JIS for the new millenium, but that's no help to someone who has an older Pro 5 vis crank. Stronglight and TA bottom brackets from the vintage era are pretty much interchangeable, if that helps. As Grand Bois pointed out JIS will probably work, but the spindle length is going to be a question mark, since you'll probably need a shorter spindle in JIS than the original one. Also, lots of the JIS stuff available (cartridge BBs) have symmetrical spindles, while I believe that TA and Stronglight used slightly asymmetrical ones (right side longer). That works the opposite direction from "JIS spindle ends are stubbier" in the "what spindle length will work?" department.
I don't agree. I think he understands more than he wrote on his webpages, and understands more parts than he sells. He's been at this a long time. And I've spoken to him about the ISO/JIS split, and found out that the mid-90s Alize on my wife's Terry needs a JIS spindle. But that's not to say that Kone or Heine would not be better sources.

If you want to work it all out yourself, first take any Shimano BB and verify that the taper fits properly on your crankset. Try a Campy end as well, to confirm JIS v. ISO. Then attempt to install the crankset on a bike using the correct taper type. Take measurements fo the fitment using the guidance in Barnett's and/or Sutherland's on spindle selection and fitment, and see what the dimensions should be for a correct installation. Then convert all the specs for the spindle BB to best-approximation specs for a cartridge BB of appropriate taper. Then buy what you need and test fit it.

Not simple.
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