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Old 03-11-11, 09:36 PM   #1
fitnessrxs
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Shimano 105 RD-5700 with 5600 shifter.

Could someone tell if i can use a Shimano 105 5700 rear derailleur with a Shimano 105 5600 shifter? Thanks
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Old 03-12-11, 03:28 AM   #2
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I'm running 7800 shifter's with 5700 rear, the 7800 is the same generation as the 5600, so can't see why it won't work
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Old 03-12-11, 05:56 PM   #3
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+1. It should work perfectly.
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Old 03-13-11, 10:55 AM   #4
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Thanks for the input. Was wanting to change my cassette and cranks and the new set up would put me at 31t total capacity and the 5600 are only rated at 29. Do you think that I could get away with running a 31t set up on a 29t. The 5700 are rated up to 33t total capacity so I may have to switch.
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Old 03-13-11, 11:34 AM   #5
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Yes, you should get a new RD with 33T or higher wrap capacity. Other less-than-ideal options to make your current RD work include:

- Size the chain using the big/big + 1" method. You won't be able to use the inner chainring and smallest cogs or else the RD won't be able to take up the chain slack and the RD will fold into itself.
- Size the chain to work with the small/small combo. You will NOT be able to use the outer chainring and the largest cogs; attempting to do so could snap the too-short chain or cause other damage.

If it were a triple chainring setup, I'd be tempted to try the first option since there's little reason to use the inner chainring and the smaller cogs.

On a double setup, I'd do it right with the correct RD. I'd want to be able to use the inner chainring with the smallest cogs and though using the outer chainring with the largest cogs is not recommended, I'd want to be able to accidentally use it without causing damage.
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Old 03-13-11, 12:15 PM   #6
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The setup I'm running is 7800 shifters, 5700 compact crank 50/34, 5700 Front & Rear Mechs & SRAM Apex 12-32 cassette; this is a new build, and have only done 2 test rides totaling about 40km, but shifting at the rear has been perfect so far, looking at putting in another few hundred km over the next few weeks, so that will bring out any issues

from looking at what you are doing, it's similar, the shifters don't really matter for the cassette ratio, as long as it is the right speed.
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Old 03-13-11, 12:48 PM   #7
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I'm running a Sram 11-32 Apex cassette with a Ultegra 6603 "GS" RD and 6600 brifters. works great. The 6600 short arm RD may not work, have not tried it.
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