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Old 12-13-09, 12:40 PM   #1
pwr14
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6 speed derailleur

Does anyone know if a Shimano 600 RD-6401 can be stopped down far enough to run a 6 speed uniglide
index mode or do I have to find a RD-6400 ?

TIA pwr
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Old 12-13-09, 12:58 PM   #2
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Quote:
Originally Posted by pwr14 View Post
Does anyone know if a Shimano 600 RD-6401 can be stopped down far enough to run a 6 speed uniglide
index mode or do I have to find a RD-6400 ?

TIA pwr
6-speed cassettes and freewheels have a wider spacing between cogs than 7-speed, so the answer is "no problem". Bolt it on, adjust it out, and go ride.
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Old 12-13-09, 01:39 PM   #3
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I'm using a 10 speed front derailuer on a 7 speed freewheel ,and it works fine.
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Old 12-13-09, 03:18 PM   #4
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For rear derailers, all Shimano stuff since the advent of indexing is theoretically compatible (except pre-9-speed Dura-Ace which had its own unique cable-pull ratio).
However, newer rear derailers designed for more gears have tighter tolerances. A 6-speed-era RD will shift very slugglishly on a 10-speed cassette, but a 10-speed-era RD will shift very quickly on a 6-speed freewheel.

To answer the OP's specific question, 6-speed freewheel is still narrower than 10-speed cassette, so the 10-speed-era RD will have no trouble covering that range.

For front derailers, there is the added factor that higher-speed chains are narrower, and a 10-speed-era FD may rub very easily on a wider 6-speed-era chain.
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