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Converting 9spd Campagnolo...to 8spd?

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TJM
  
Crazy question here, but not without a bit of reason! Here in the UK I often see bargain priced 8spd wheels, Shamals, disks, etc. I have a Giant OCR I use for club TTs and a Triathlons, I've built it up with a Veloce 9spd groupset. So I'm wondering if I could get it working with an 8spd hub. I assume the cog spacing is different between the 8 and 9, so I can't just lock out one gear. Possible options I can think ofbut have no idea if they would work, are:
Break down the 9 cassette, leave off a cog and squeeze it onto the 8 hub. I could make up simple spacers if needed.
Swap freehub bodies.
Re-build a spoked wheel, like the shamals, onto a 9spd hub that has an appropriately divisible number of holes. For example, a 12 spoke wheel onto a 36 hole hub, using every third hole, or a 16 onto a 32. My traditional wheelbuilding skills are pretty good and I've built 18-spoke TT wheels this way, but I don't know about digging into a Shamal!
Or I'll just buy a pair to use the front!

Tried the archives but couldn't find anything relevant...somebody out there must know the answer!


Cheers,
Tim

boudreaux
  
Originally posted by TJM
Crazy question here, but not without a bit of reason! Here in the UK I often see bargain priced 8spd wheels, Shamals, disks, etc. I have a Giant OCR I use for club TTs and a Triathlons, I've built it up with a Veloce 9spd groupset. So I'm wondering if I could get it working with an 8spd hub. I assume the cog spacing is different between the 8 and 9, so I can't just lock out one gear. Possible options I can think ofbut have no idea if they would work, are:
Break down the 9 cassette, leave off a cog and squeeze it onto the 8 hub. I could make up simple spacers if needed.
Swap freehub bodies.
Re-build a spoked wheel, like the shamals, onto a 9spd hub that has an appropriately divisible number of holes. For example, a 12 spoke wheel onto a 36 hole hub, using every third hole, or a 16 onto a 32. My traditional wheelbuilding skills are pretty good and I've built 18-spoke TT wheels this way, but I don't know about digging into a Shamal!
Or I'll just buy a pair to use the front!

Tried the archives but couldn't find anything relevant...somebody out there must know the answer!


Cheers,
Tim 8 speed cog spacing is 5mm, and 9 is 4.55. The casette spline pattern is also different. It may be possible to switch freehub bodies from an 8 to a 9 speed. www.branfordbike.com has alot of info in their online catalogue. Check under campy hubs or hub bodies.

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