Bicycle Mechanics - Drivetrain compatibility

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Raid1280
02-25-05, 08:17 AM
Hi, I had a quick question about my MTB drivetrain. I have a raceface crankset and a Shimano rear cassette. I've had some very good mechanics work on the shifting and it seems that there is always a space where the chain will rub. Is there a compatibility issue here, I'm looking at buying a new cassette, are there any that anyone would recommend?

Eric

Maelstrom
02-25-05, 09:10 AM
Moved to a forum where you might get more responses. :)
sydney
02-25-05, 09:29 AM
Hi, I had a quick question about my MTB drivetrain. I have a raceface crankset and a Shimano rear cassette. I've had some very good mechanics work on the shifting and it seems that there is always a space where the chain will rub. Is there a compatibility issue here, I'm looking at buying a new cassette, are there any that anyone would recommend?

EricWhy don't you define this 'space' where you get the rubbing.

Waldo
02-25-05, 10:23 AM
Crankset has nothing to do with the cassette, if that's what you're asking. If you are trying to use the big ring/large cog or small ring/small cog combos you will always get a rub. Crosschaining is not your friend.
Raid1280
02-25-05, 10:26 AM
The rubbing takes place on the front derailleur, depending on the gear it takes place on either side. I wondered if I needed to widen the front derailleur cage? Also I have quite a bit of mileage on this old Shimano cassette, 4 years of adventure racing and training and perhaps the cassette is worn? As of now this is my drivetrain setup:

Shimano XTR square BB
Race Face Crankset
Shimano Deore Front Derailleur
Shimano Deore Rear Derailleur (I'm replacing this, had an accident with it in the last race)
Shimano Cassette (I'm replacing this also)

I was thinking maybe with a littler wrench work I could get just about any 8-spd cassette to work with the Race Face crank. What do you guys think?

Eric
sydney
02-25-05, 10:28 AM
The rubbing takes place on the front derailleur, depending on the gear it takes place on either side. I wondered if I needed to widen the front derailleur cage? Also I have quite a bit of mileage on this old Shimano cassette, 4 years of adventure racing and training and perhaps the cassette is worn? As of now this is my drivetrain setup:

Shimano XTR square BB
Race Face Crankset
Shimano Deore Front Derailleur
Shimano Deore Rear Derailleur (I'm replacing this, had an accident with it in the last race)
Shimano Cassette (I'm replacing this also)

I was thinking maybe with a littler wrench work I could get just about any 8-spd cassette to work with the Race Face crank. What do you guys think?

EricThe derailer rub is not about the crank, unless it or the rings are bent.
darkmother
02-25-05, 12:49 PM
Check out a couple of things: First, you want to set your front deraileur so that the bottom of the cage just misses the top of the big ring without touching it when you shift. You will also want to ensure that the center line of the FD cage, when viewed from above, is parallel to your chain rings. Finally, you may want to try some different sized spacers between the smallest ring and the crank. Mine were too large to work well with 9s FD and chain (originally 8s crank)