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  1. #1
    Junior Member
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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
    2004 Klein Q Pro
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  2. #2
    Insane Bicycle Mechanic Jeff Wills's Avatar
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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.
    Jeff Wills

    All my bikes.

  3. #3
    Senior Member nvrlnd7's Avatar
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    I'm using a 10 speed front derailuer on a 7 speed freewheel ,and it works fine.

  4. #4
    me have long head tube TallRider's Avatar
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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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