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  1. #1
    soonerbills soonerbills's Avatar
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    Ross yard sale find

    A 10 buck buy looks nice enough but I still am puzzled over the crank. It is like a free wheel. Are these rare? of a sorts?.....













  2. #2
    soonerbills soonerbills's Avatar
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    Sorry 'bout the double pics

  3. #3
    Velocommuter Commando Sirrus Rider's Avatar
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    Quote Originally Posted by soonerbills View Post
    A 10 buck buy looks nice enough but I still am puzzled over the crank. It is like a free wheel. Are these rare? of a sorts?.....












    I'll venture a guess that it has a variation of the Shimano Positron system which is a precursor of Index shifting.
    Riding 19 Years of Specialized Sirrus Tradition.
    Live in Houston? Come to http://bicyclecommutehouston.blogspot.com/
    1988 Specialized Sirrus, 1989 Alpine Monitor Pass MTB, 2007 Specialized Sirrus 700C hybrid, 2007 Schwinn Town & Country trike, 1970 "Resto-Improved" Raleigh 20, 1970 "WIP" Raleigh 20, and 1980 "WIP" Schwinn Town & Country trike

  4. #4
    Senior Member gurry's Avatar
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    The Shimano Front Freewheel System (FFS) was introduced to allow shifting while stopped.

  5. #5
    Senior Member
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    That bike has the Shimano Front freewheel System. It allows shifting whenever the bike is moving forward. They usually work pretty well. Hard to get parts for them...positron derailler, solid wire shifter cable. The rear cogset is semi fixed, that is real hard to find! The bike frame is standard and it can be converted to a normal drivetrain with little trouble. Enjoy the ride.

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