Campy 10 speed double with 7-speed chain?
03-26-10, 09:00 AM
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Campy 10 speed double with 7-speed chain?
I just got a nice new Veloce 10 speed compact crankset, and I'm planning to use it on a 7-speed bike with a 7 or 9 speed chain, probably Sram PC-951. On another bike with a similar set-up I get occasional scraping of the chain on the big chainwheel, when in the smallest or next-smallest rear sprocket. I think I've seen sets of chainring spacers intended to increase teh chainwheel spacing back to 9 or 8-speed levels, but don't know which one to get - Branford had a load of sizes and not much clear wisdom on selection, at least back when I looked. What thickness of spacer do I need?
Knowing this I can even snip some out from aluminum or brass shim stock.
Knowing this I can even snip some out from aluminum or brass shim stock.
03-26-10, 09:13 AM
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Chainring spacing has not really changed as the speeds have increased. Chains have gotten thinner and the ramps and pins on chainrings have become suitably more aggressive. That's not to say that no changes at all have been made but they were minor tweaks and AFAIK confined to certain 10 and 11 speed cranksets. Because the ramp/pin changes I would not recommend using a 7 speed chain on a 10 speed crankset. Chainring spacers are likely to create front shifting issues.
03-26-10, 09:48 AM
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I currently run a 7-8s chain on a Veloce 10s crankset without issue.
03-26-10, 10:00 AM
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Chainring spacing has not really changed as the speeds have increased. Chains have gotten thinner and the ramps and pins on chainrings have become suitably more aggressive. That's not to say that no changes at all have been made but they were minor tweaks and AFAIK confined to certain 10 and 11 speed cranksets. Because the ramp/pin changes I would not recommend using a 7 speed chain on a 10 speed crankset. Chainring spacers are likely to create front shifting issues.
You can ride the 10s cranks with most 9s chains (which will run on 7s cassettes). I'm still using old Sram PC-89r on mine because I didn't want to get involved with Campy's 10s system, and I like the master link. If you don't increase the separation a bit you'll have greater risk of the chain brushing the inner face of the outer ring, while using the inner ring with the outer part of the cassette. In your case I'd set the bike up and try it first, then decide whether to increase the separation or not.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
03-26-10, 10:21 AM
#6
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I hate to correct folks but this is wrong. 7, 8 & 9s chainring separation is the same, but 10s is definitely less. When Campagnolo made 10s cranks rather than thin the spacer built into the right crank spider, they milled a recess into the outer chainring's mounting area moving it inboard a bit. Don't hold me to this but I believe it was by 0.8mm. This is the only difference between the Campy 10s and 9s cranks and chainrings.
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