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Old 09-30-12, 11:24 PM   #1
veggie
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9 speed Campy conversion cassette

No luck getting an answer in the tandem section so I'll ask here.

Campagnolo shifters, Campagnolo RD, but no campagnolo freehub. I have a Chris king tandem wheelset so switching freehubs(or driveshells as CK calls them)is out of the question. I have an orphaned set of 9speed campy cassette spacers, would I run into problems using a Miche shimano cassette with the campy spacers? If I'm not mistaken, Campy cogs are of a different width so even if I use campy spacers the spacing will be off, right?

tl;dr:help me build a 9 speed Campagnolo conversion cassette to use on a shimano hub.

Thanks.

Ps: Don't suggest using a Jtek, that's my last resort.
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Old 09-30-12, 11:51 PM   #2
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First, let's get the specs on the standard items:

Campy 9spd
overall width = 38.2mm
centre-to-centre spacing = 4.55mm between centre of cogs
cog thickness = 1.75mm
spacer thickness= 2.8mm

Shimano 9-spd
cog thickness = 1.78mm

Using the Shimano 9-spd cogs with Campy 9-spd spacers will give you c-t-c spacing of: 1.78 + 2.8mm = 4.58mm. That 0.03mm difference in c-t-c spacing won't be an issue as it's close enough. You'll need to shim the Shimano 4.34mm top-cog with integral spacer with an additional 0.2mm spacer to match the Campy spacing. Then you'll have a Shimano cassette with Campy spacing with minor variation.

To reduce any negative effects of compounding the differences as you sweep across the gears, adjust cable-tension so it shifts perfectly in the middle 3-cogs. Then you'd be compounding the variations only 4x in each direction.

Last edited by DannoXYZ; 10-01-12 at 12:09 AM.
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Old 09-30-12, 11:53 PM   #3
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Thanks, that's what I was looking for
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Old 10-01-12, 12:00 AM   #4
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I reckon that'll be win, because not only is it a small discrepancy, but it'll be overshifting rather than undershifting.

How do the Campy spacers go on a Shimano-splined cassette body, though? Just wondering about the ID; I'd imagine it's a one-way street (likely in your favour) unless they're pretty damn close...

Last edited by Kimmo; 10-01-12 at 12:03 AM.
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Old 10-01-12, 12:02 AM   #5
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While I've got your attention, can anybody recommend a cassette other than the Miche that is a loose cog cassette?

Are any Shimano or Sram cassettes loose cog?
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Old 10-01-12, 12:07 AM   #6
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Well, a CS-HG50 (Tiagra) 9spd cassette is only $40; it's hard to imagine it uses a spider at that price...

Although it may be riveted together, that's hardly a deakbreaker.
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Old 10-01-12, 12:10 AM   #7
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Oh yeah! That's the cassette I was considering before, when I was going to use a jtek and a shimano RD. I can get shimano cassettes fairly cheap through work.

Edit: I cant tell if they are riveted or not from looking at the shimano technical docs. It just says up to 8 out of 9 are "secured". I've never had to worry about this with a cassette, so I don't really know how to tell without having it in my hands.

Last edited by veggie; 10-01-12 at 12:17 AM.
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Old 10-01-12, 12:20 AM   #8
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Prolly uses those little allen-head screws, but if they're rivets a dremel or drill would make short work of em.
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Old 10-01-12, 12:22 AM   #9
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Guess it couldn't hurt to try. If not I can always stick it on my cross bike.
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Old 10-01-12, 12:27 AM   #10
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Someone who works in a shop should be able to tell you if it has a spider in a jiffy.

If it doesn't, you're golden.
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Old 10-01-12, 12:28 AM   #11
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That would be me, I work in a shop, but i'd need to see it first.

Edit:
Quote:
Originally Posted by Sheldon Brown
Some Shimano flat steel sprockets and spacers are in bolted or riveted assemblies[...]. The bolts or rivets only serve to keep sprockets and spacers in order when the cassette is not installed on the freehub. Bolts or rivets can be removed to replace sprockets or build up custom combinations..

Last edited by veggie; 10-01-12 at 12:36 AM.
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Old 10-01-12, 12:57 AM   #12
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That's what I've been saying; they're just for convenience when the cassette's off the bike. My 9spd Ultegra cassette doesn't even have any provision for em; apart from the the three largest sprockets on a spider, it's all loose.
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