Bicycle Mechanics - Ultegra 10-speed GS rear derailleur w/9-speed Dura Ace shifters & 11-32 XT cassette
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02-06-12, 11:45 PM
Will an Ultegra 10-speed long-cage rear derailleur work with 9-speed Dura Ace shifters & 9-speed 11-32 XT cassette (crankset is double 46/30)?
02-07-12, 01:37 AM
Maybe. The "10-speed" RD will work with any number of gears except pre-9-speed Dura Ace and 10-speed Dina-sys, as long as the number of gears for the cassette and shifter match.
The issue is that the road RD--regardless of cage length--isn't meant to handle more than a 27- or 28-tooth cog. If you already have the RD, then try installing the b-tension screw backwards to pull the RD further away from the cassette. If you don't have an RD already, get a 9-speed or lower long-cage Shimano MTB RD. I'd get one that's not Shadow and traditional top-normal (like the road ones).
02-07-12, 02:31 AM
The issue is that the road RD--regardless of cage length--isn't meant to handle more than a 27- or 28-tooth cog. If you already have the RD, then try installing the b-tension screw backwards to pull the RD further away from the cassette.
Current Shimano road GS cage RD's will handle over 28t , an SS will go up to 28t,
SS - http://www.shimano.com/publish/content/global_cycle/en/us/index/products/road/ultegra_6700/product.-code-RD-6700-SS.-type-..html
The GS although not offically spec'd will handle upto a 32t with no issues, I'm using 105 / 5700 with SRAM 1050 cassette in this config, with no need to swap the B screw around.
02-07-12, 11:16 AM
I have an Ultegra GS derailleur on an 11-30 cassette. It grumbles a little on the 30- tooth cog even with the b-screw most of the way in, but it shifts just fine. By grumbling I mean that the guide pulley is close enough to the cog that it makes a grumbling noise as the chain wraps first one way then the other, with the pulley nearly touching the teeth of the cog. I don't use the 30-tooth cog much, so it's not a big problem for me, but using a MTB derailleur would be a bit better in the 32-tooth case - they're built for extreme ranges of cassette.
02-07-12, 11:29 AM
Current Shimano road GS cage RD's will handle over 28t , an SS will go up to 28t,.
That's not what Shimano's product literature says. It gives a 28T maximum cog size for both the SS and GS rear derailleurs and the only difference is the total wrap capacity. If you can use a 32T cog with any Shimano road rear derailleur it's a lucky coincidence of having a derailleur hanger long enough and most frames won't permit it.
I agree with Jive Turkey's advice to the OP; if he has the rd and cassette already, try them but don't be surprised if they don't work together.
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