Bicycle Mechanics - 9 speed Campy conversion cassette
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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.
Ps: Don't suggest using a Jtek, that's my last resort.
10-01-12, 12:51 AM
First, let's get the specs on the standard items:
overall width = 38.2mm
centre-to-centre spacing = 4.55mm between centre of cogs
cog thickness = 1.75mm
spacer thickness= 2.8mm
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.
Thanks, that's what I was looking for
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...
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?
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.
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.
Prolly uses those little allen-head screws, but if they're rivets a dremel or drill would make short work of em.
Guess it couldn't hurt to try. If not I can always stick it on my cross bike.
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.
That would be me, I work in a shop, but i'd need to see it first.
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 (http://sheldonbrown.com/k7.html#custom) to replace sprockets or build up custom combinations..
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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