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  1. #1
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    Recommendations. Tough heavy duty rear mech for 7/8 speed old school freewheel

    As in title, i need some help choosing a new rear mech. Weight is not an issue so something fail safe and compatible with a shimano revoshift twist grip shifter. The bike will be used on tough terrain with all mountain suspension frame and dh forks.

    7/8/9 speed compatible

    Any experiences or recommendations please.

    Andrew
    Land of Our Fathers. Wales U.K

  2. #2
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    Something like an 9 speed RD-M662 SLX shadow RD would do the job - they are on offer at Chain reaction cycles at the moment. Pretty stiff spring, low profile and hard wearing.

  3. #3
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    Thanks will take a look now.
    Land of Our Fathers. Wales U.K

  4. #4
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    Also, long, medium, short? What difference will it make and why are there differing lengths?
    Land of Our Fathers. Wales U.K

  5. #5
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    Quote Originally Posted by brumbrum View Post
    Also, long, medium, short? What difference will it make and why are there differing lengths?

    I have just seen the sticky on this topic, apologies.
    Land of Our Fathers. Wales U.K

  6. #6
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    Shimano megarange derailers are the only ones that work the old cog sets. DSC02620 | Flickr - Photo Sharing!
    "Dish is illogical." Spoke of Vulcan.

  7. #7
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    Quote Originally Posted by zerodish View Post
    Shimano megarange derailers are the only ones that work the old cog sets. DSC02620 | Flickr - Photo Sharing!
    I am afraid that is not true. But if you happen to stumble upon a megarange freewheel with a 11tooth end cog please let me know
    Land of Our Fathers. Wales U.K

  8. #8
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    Quote Originally Posted by zerodish View Post
    Shimano megarange derailers are the only ones that work the old cog sets. DSC02620 | Flickr - Photo Sharing!
    If you put a custom 40T Chain ring on as a rear cassette sprocket then all bets are off as to what RD works
    Using a standard 7/8 speed Shimano Megarange freewheel you can pretty much use any 7/8/9 speed RD you want as long as:
    • the cassette sprockets match the shifter indexes
    • the shifter cable pull matches the RD.

    My kids 24" bike has a 7 speed Shimano MR cassette and SRAM twisties a 9 speed SRAM X7 RD works perfectly well with it after the X3 broke. I've used low end Alivio 8 speed as a temp replacement RD on XTR/Xt 9 speed drive train - It is only Dynasis which has buggered all this up

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