Bicycle Mechanics - Compatiliblity Q: Campy ergo, Shimano XT rear der.

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docbluedevil
05-20-07, 09:42 PM
I'm planning to build up a roadie for my wife based on a 2005 Bianchi 1885 frameset.

I'd like to use some spare components in the parts bin (e.g. Centaur 53/39 crankset, Centaur front der. etc.).

I'd like to have Campy Ergo shifters as well (read, hidden cables).

To lower the gear inches for the local hilly terrain (while still using the 53/39 double), I'd like to install a MTB cassette (e.g. XT 11-32, 9 speed). I calculated that a 39-32 (32 gear-in.) is as easy to push as a 30-25 (31.5 gear-in.). I've heard some long cage ders. can pull it off.

Questions:

1) Can an Ergo shifter work with a XT(R) rear derailleur? I have a tandem with an Ultegra STI and a XTR rear derailleur which works without problem, so I'm assuming yes.

2) If yes, do I have to get a 9 speed Ergo or would a 10 speed Ergo also work? Don't Campy ergo shifters have an unlimited range (or something like that)?

3) Could a roadie rear der. (e.g. long cage Centaur) work with an 11-32 cassette? I know that mfg. info says it can shift up to a 29 cog.

HillRider
05-20-07, 10:11 PM
1&2. Campy 10-speed Ergos will work fine with a Shimano rear derailleur (MTB or Road) and Shimano 9-speed cassette if you use the appropriate Jtek Shiftmate. I have this combination on one bike and the shifting is flawless.

3. Centaur long cage rd's are rated for a 29T max rear cog and I don't know how conservative that figure is. Shimano's road rear derailleurs are rated for a maximum of 27T and are generally found to work well with up to 30T but no larger.
docbluedevil
05-20-07, 10:28 PM
1&2. Campy 10-speed Ergos will work fine with a Shimano rear derailleur (MTB or Road) and Shimano 9-speed cassette if you use the appropriate Jtek Shiftmate. I have this combination on one bike and the shifting is flawless.

3. Centaur long cage rd's are rated for a 29T max rear cog and I don't know how conservative that figure is. Shimano's road rear derailleurs are rated for a maximum of 27T and are generally found to work well with up to 30T but no larger.

Thanks, Hillrider, for the good info!

I'll have to look into the Jtek Shiftmate.

docbluedevil
05-20-07, 10:31 PM
My wife and I similar enough in proportions that I will likely use this bike as well at times. I train with a Powertap (Shimano) wheelset.

Could a XT(R) rear derailleur/Campy Ergo work with an Ultegra 12-27 cassette (that's on my Powertap)?
HillRider
05-20-07, 10:39 PM
Could a XT(R) rear derailleur/Campy Ergo work with an Ultegra 12-27 cassette (that's on my Powertap)?

Sure, use the same Shiftmate unless the 12x27 is a 10-speed. Then you need a different Shiftmate.