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  1. #1
    Senior Member
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    Jun 2008
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    Central CT USA
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    1991 Tomassini Prestige 1973 Raliegh Supercourse, 1975 Panasonic Sport Deluxe, 1983 Fuji S-12, 1975 Motobecane Mirage, 1983 Motobecane Super Mirage 1999 Trek 930 1989 Trek 930 ,
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    Mountain bike rear deraiileur on old road bike

    Ok, The ancient Huret Allvit on my 1974 Raleigh Record is fading finally. I just got a mountain bike derailleur off a Huffy Mountain Bike.

    I know, please don't LOL too hard. But it did have Shimano SIS components, so I stripped it. Those old thumb shifters were pretty cool in their day, some still swear by them.

    I figure any type of Shimano is better than that Huret.

    The Huffy MTB had a five speed rear cog, so I think this will work. Has anyone ever tried this? I noticed when you go on REI's site they don't list MTB or road, just whatever speed it is. Hmmm. And God, are derailleurs expensive new. whew.

  2. #2
    Senior Member Bill Kapaun's Avatar
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    Feb 2007
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    Mid Willamette Valley, Orygun
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    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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    If it'll bolt on, it'll work.
    Had to do a similar swap for my brothers old Takara after somebody kicked his SunTour RDER into his spokes.
    Had to lengthen the chain though.

  3. #3
    Senior Member
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    Thanks Bill, oh doh!!! I forgot about the chain length. Maybe I can use the chain off the Huffy. It's in good shape.

  4. #4
    Senior Member
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    Aug 2005
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    Pittsburgh, PA
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    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    Quote Originally Posted by Bill Kapaun View Post
    Had to lengthen the chain though.
    Why? If the gearing was the same, the rear derailleur has no effect on required chain length.

  5. #5
    Senior Member Bill Kapaun's Avatar
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    Mid Willamette Valley, Orygun
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    86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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    Quote Originally Posted by HillRider View Post
    Why? If the gearing was the same, the rear derailleur has no effect on required chain length.
    It does when you go from a SunTour Honor to a X Mart Shimano MTB RDER!
    Unless it was just my imagination that the chain tightened up like a banjo string when I shifted to Big:Big!

  6. #6
    Senior Member
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    Quote Originally Posted by HillRider View Post
    Why? If the gearing was the same, the rear derailleur has no effect on required chain length.
    The longer cage should want an extra link or 2. But meh, minor details.

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