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Campy 8-speed/Shimano 8-speed compatibility(4 posts)

Campy 8-speed/Shimano 8-speed compatibilityrtyszko
Sep 28, 2002 8:01 AM
I've ridden a campy 8-speed cassette/wheel with my 105 group intermittantly over the past 5 years without any apparent problem. Am I doing any harm/excesive wear to the chain and/or derailleurs? I ask because the cassette is worn and needs replacing (Is the only place to find them?) and I'm wondering whether it's even worth it. I have two other wheel sets, but I like the campy hubbed ones because they're great for the fowl weather as "beaters" at this point.

the facts....C-40
Sep 28, 2002 1:19 PM
Campy 8 speed cog are 1.9mm thick with 3.1mm spacers, which produces 5.0mm center to center spacing. Shimano 8 speed cogs are 1.8mm thick with 3.0mm spacers, which produces 4.8mm spacing. The .2mm difference is 4% per shift.

Since the shimano derailleur undershifts by .2mm on each shift, the error could accumulate to as much as 1.4mm (28%)after 7 shifts. To minimize the error, the derailleur should be adjusted to be centered in the middle of the cassette to distribute the error between up shifts and downshifts.

You can buy a spacer kit from that will eliminate the spacing error, but it cost about $25. Brandford also has new record cassettes for $50.

Personally, I wouldn't invest that much in an old wheel.
re: Campy 8-speed/Shimano 8-speed compatibilitycurlybike
Sep 29, 2002 7:30 AM
Branford bike did have them. Your LBS can get them from QBP or Ochsner. I am using the opposite combination. Campy shifters and S cogs. You will not hurt any thing by doing as you are. Shimano hubs seem to seal out water better than Campy from my experience.
Right on, thanks you two. (nm)rtyszko
Sep 30, 2002 4:21 AM