|Campy Record 9spd ergo and Dura Ace rear||Shaunus|
Mar 31, 2003 6:49 PM
|I've heard 9spd Campy and 9spd shimano are compatible. ie. It's possible to use shimano 9spd cluster and chain with 9spd campy. The reason is I have the opportunity of getting 9spd record and was thinking of running the Record 9spd Ergos and rear deraileur with the rest (cranks, chain and front derailleur) dura-ace.
I love the record levers but want to keep the cost down for those constant chain and cluster replacements.
Anyone have any experience??
Mar 31, 2003 7:14 PM
|The cog spacing on Shimano 9 speed is 4.32mm. Campy 9 speed cog spacing is 4.55mm. The campy derailleur will overshift by 5% per shift. The error will accumulate to a minimum 20% positioning error after 4 shifts.
The best shifting that you can get requires the rear derailleur to be aligned as closely as possible on the center cog (not the first), to distribute the error equally between up shifts and down shifts.
This setup will work fairly well as long as you spend most of your time on the middle cogs. You can expect the shifting to deteriorate and more noise at either end of the cassette.
A better solution is to buy a Wheels Manufacturing "Accelerator" cassette from Excel Sports, which has the proper spacing ($100) or stick with all campy parts. This cassette is also avaialble in a 10 speed model.
Mar 31, 2003 9:30 PM
|Thanks for that. Very informative. Do you know what the difference in cable pull is? If the cable pull difference is within 5%, then could I assume that using the Campy Ergo lever with a shimano rear derailleur will provide better shifting than the Ergo lever with Campy derailleur on a shimano cassette?|
Apr 1, 2003 5:02 AM
|I also tried to ride Camp shifters with Shimano Cassette, and it workes great.
And by the way the shifting error never get´s close to 20%.
If you calculate 4 shifts the Campy will move 18,2 mm, while the Shimano only meassures 17,28mm.
Thats a difference of 0,92mm.
Thats close to +/- 5% shifting error from top to bottom, if you adjust the shifter to be perfect in the center cog.
Apr 1, 2003 6:08 AM
|While your figures regarding the total travel are correct, they are not relevant. The percentage of positioning error must be calculated based on the the distance for a single shift, not four or any other quantity. With your reasoning, any number of shifts would always be 5% off.
After four shifts the error is .92mm as you stated, but the positioning error is .92/4.32 = .21, which is 21% off location.
|flawed math...||Rusty Coggs|
Apr 1, 2003 6:42 AM
|Regardless of the math,it's hard to argue with people in the business of selling ,setting up bikes and keeping custommers happy that say it does work.Sheldon Brown , and Peter Chisholm of Vecchio's Bicicletteria among many others.|
Apr 1, 2003 8:48 AM
|As a mechannical engineer, my job is to understand how a mechanical system works.
I clearly noted that it will work, but if you do not understand why the derailleur should be adjusted to the middle cog, you could go through a frustrating process to get the derailleur adjusted, never understanding why it does not work well if the "normal" adjustment procedure is followed.
If the derailleur travels the proper amount, the cable tension can be increased until the derailleur makes a good shift from the smallest cog to the second cog and the rest will shift properly with little additional adjustment.
If you follow this process with the shimano cassette, the derailleur will eventually over travel enough to attempt a two-cog shift. As others noted, tightening the limit screws will help to reduce the error at both ends of the cassette.
|more like 15% max if the limit switches are set properly||ridingthegyro|
Apr 1, 2003 7:44 AM
|On the fourth shift up or down the limit switch can perfectly allign the derailler on the outermost cogs. 15% max apply only to the cogs next to the outermost ones but is within the tolerance level such that they will work.|
|re: Campy Record 9spd ergo and Dura Ace rear||rjrussell|
Mar 31, 2003 10:52 PM
|I asked this exact question last year here. It was 80% no, 20% yes. Being that I had a chance to get a cheap set of Rolf Sestrieres, I took a chance. I have a complete 9 spd Campy set-up and run a 9-spd Dura-Ace cassette. I had a good shop set the bike up and it works great. No noise on either end of the spectrum, no gnashing, no grinding, no problems. I'm a mech engineer by trade and would complain if it was even a bit off. The only suggestion I might give is going with a Campy chain, or better yet a Rohloff 9 spd chain. There's a really good website for this combination. Check them out at