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  1. #1
    Senior Member Sincitycycler's Avatar
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    Can an 8 speed crankset be used to replace a 6 speed?

    I have an 1987 Schwinn Letour with a Sugino 52/40 crankset with 170mm arms.

    The drive train is a 6 speed.

    Can I substitute a 90s Dura -ace 8 speed crankset for this? Thanks
    "How did all those 'Keep Off the Grass' signs get there?"

  2. #2
    Winter commuting mode Tequila Joe's Avatar
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    Most 5, 6, 7 or 8 speed chains have an inner plate width of 2.35-2.45mm. So, you shouldn't have any problems swapping to a 8 speed chainring.

    It is when you get to 9 or 10 speed chains where incompatabilites with older drive trains start as 9 & 10 speed chains have inner plate widths between 2.15-2.28mm

  3. #3
    Yet another vegan biker
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    I run a 10-speed Veloce 53-39 crankset on my 82 Letour.

    I also swap between 8-speed cassette and 6-speed freewheel wheelsets on the old bike. No problems.

    It is when you get to 9 or 10 speed chains where incompatabilites with older drive trains start as 9 & 10 speed chains have inner plate widths between 2.15-2.28mm
    I do try to keep cross-chaining to a minimum, as there is so little clearance between the rings. I haven't seen any sign that the chain actually touches the adjacent ring, though.

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