Ultra Torque Crank In Swiss Thread Frame?
03-10-12, 11:38 PM
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Ultra Torque Crank In Swiss Thread Frame?
Hey, I did search, found no glimmer of promise, and am wondering if you will extinguish my hopes entirely.
If you have a frame with Swiss threading in the BB, is there any way to use a Campagnolo Ultra Torque crank?
If you have a frame with Swiss threading in the BB, is there any way to use a Campagnolo Ultra Torque crank?
03-11-12, 02:38 AM
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Received wisdom - Velospace had some clues - Get the BB re-threaded to English. Then you can use an English Ultra Torque BB. LBS or a framebuilder will have the right tools. As an engineer I can rationalise this to be workable (English 1.37" (34.8mm) x 24tpi is not too far different from Swiss 35mm x 1mm (25.4tpi), thanks Sheldon) because not much metal will get removed, BUT I have not done this myself, so maybe someone else will respond to confirm. Some alternatives (sorry for mentioning as I guess you may already know) are Phil Wood BB with Swiss cups OR Velo Orange threadless BB to use with a classic square taper chainset.
03-11-12, 08:23 AM
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Received wisdom - Velospace had some clues - Get the BB re-threaded to English. Then you can use an English Ultra Torque BB.....I can rationalise this to be workable (English 1.37" (34.8mm) x 24tpi is not too far different from Swiss 35mm x 1mm (25.4tpi)... because not much metal will get removed...
The more common way to salvage a damaged or unusual bottom bracket shell is to ream and retap it to Italian (36 mmx24tpi, right hand threads on both sides).
03-11-12, 09:05 AM
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If you look at the dimensions, Swiss cups are LARGER in diameter than English cups so even if you could make the thread pitch the same, the English cups will be a very loose fit. I don't think it will work.
The more common way to salvage a damaged or unusual bottom bracket shell is to ream and retap it to Italian (36 mmx24tpi, right hand threads on both sides).
The more common way to salvage a damaged or unusual bottom bracket shell is to ream and retap it to Italian (36 mmx24tpi, right hand threads on both sides).
03-11-12, 11:55 AM
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Ah, veeery interesting. So there is hope! Thank you all.
03-11-12, 12:04 PM
#6
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Swiss thread typically is 35 by 1 french metric, but right cup is LH thread.
[ref. Sutherlands]
Stick with square taper cranks and Phil has Swiss mounting rings to fit their BB..
[ref. Sutherlands]
Stick with square taper cranks and Phil has Swiss mounting rings to fit their BB..
Last edited by fietsbob; 03-11-12 at 12:09 PM.
03-11-12, 06:29 PM
#8
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Down to the shop, get out the frame taps , then Take it out to 36mm, Italian ,
as then you might have a better thread condition when you are done,
26tpi is finer than 1 per mm + given BSC, 1.370" is 34.8mm.. ,so smaller..
or just get a frameset that is Italian or BSC thread .. sell the collectable as is..
as then you might have a better thread condition when you are done,
26tpi is finer than 1 per mm + given BSC, 1.370" is 34.8mm.. ,so smaller..
or just get a frameset that is Italian or BSC thread .. sell the collectable as is..
Last edited by fietsbob; 03-11-12 at 06:34 PM.
