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Campy/Shimano 9spd compatibility(10 posts)

Campy/Shimano 9spd compatibilityrjrussell
Jun 7, 2002 10:32 PM
Can you run a Shimano 9spd cassette with a 9spd Campy rear derailleur without spacers/cassette mods or chain swaps? I have a 2001 9spd Campy Chorus group and a recently acquired 9spd Rolf Sestriere Shimano 9spd wheel.
it will work just fine. 9 speed spacing is the same!(nm)merckx56
Jun 8, 2002 6:48 AM
not quite a fitDaveG
Jun 8, 2002 10:22 AM
It may "work" but it won't be ideal. Campy spacing is 4.55mm, Shimano is 4.34mm. Might get a bit sloppy towards the ends of the cassette. I suspect folks that say it "works fine" are perhaps just more tolerant of drivetrain noise. If it were me I'd break down and buy the spacer kit or special aftermarket cassette.
works fine on my bike!merckx56
Jun 8, 2002 11:52 AM
I bought a pair of closeout sestrieres with a campy freehub.
they're running a campy cassette with a shimano chain. it's no noisier than the straight shimano stuff. i've also setup other's bikes with shimano wheels and cassettes with campy chains. 2/10ths of a millimeter is inconsequential. most peoples derailleurs are that far of anyway. keep everything tuned and clean and the noise argument is moot one. that's why the upper pulley on a rear der floats.
works fine on my bike!DaveG
Jun 8, 2002 12:07 PM
If you're happy, I'm happy. Keep in mind that is 2/10 of a mm error PER SHIFT. Usually when this question comes up the are two types of responses: the "it works fine" like yours; and the "never could get it right" responses. There is no right or wrong, only people that are happy with it and those that are not. For me, if I spend a grand on a componenet group I want it perfect.
20-40% error not inconsequential...C-40
Jun 8, 2002 6:54 PM
The difference is 5% per shift. Even with perfect alignment of the derailleur on the middle cog, the derailleur positioning error accumulates to 20% on the fourth shift. If the derailleur isn't properly adjust the error could be as great as 40%.

The small amount of derailleur float will be used up this error on the very first shift from the center cog. After that, there is no float. Measure it sometime. Think what happens when you change from upshifts to downshifts. If there was very much float, the first shift in the opposite direction would not even happen. Float only helps when the shifters, derailleur and cassette are properly matched. It won't help correct accumulative error of this magnitude.
he 5% is not cumulativejimPz
Jun 11, 2002 4:04 PM
If the 5% difference between gears was cumulative, think about it, the Campy cassette would have to be 40% WIDER than the shimano. It is Only 5% thru the whole range.
If you get a 5% raise per week at the end of the year it is still only a 55 raise, not 260% (52*5)

JimPz
you need a math lesson...C-40
Jun 15, 2002 6:51 PM
The error on each shift is .23mm, which is 5% of the distance to make a single shift. 40% is the amount of error on the 8th shift. The accumlative error is 1.84mm which is 40% of the 4.55mm distance necessary to complete one shift. That's a huge misalignment-almost halfway between two cogs.

I don't know how you figured 40% of the total cassette width. That much error would require a 40% error on each shift. 4.55mm x 8 shifts x .40 = 14.56mm.
I know a guyMcAndrus
Jun 9, 2002 4:18 AM
I know a guy who runs Record 9 speed with a Shimano cassette. He races with it and says it shifts very well.
This site shows you how to do it:patricksc
Jun 9, 2002 6:15 AM
But you need 10 speed Campy shifters to work w 9 speed shimano. Or you could buy a CAmpy spaced-cassette.

http://www.hubbub.com/ergoleverswshim9.htm

In fact, I am going to swap my shimano for Campy soon. (I am after the flat tops of the ergo shifters.)