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  • 11 speed chainset compatible with 9 speed drivetrain?
  • epicsteve
    Free Member

    My wife is looking for suggestions for Christmas present options for me and, given I’ve been riding my road bike a lot this year I was toying with the idea of getting a power meter. Evans are listing the left-side only 4iii one for £350 at the moment, for a 11-speed 105 arm. As my current road bike is 9-speed can I just switch the chainset to an 11-speed 105 one without changing anything else – with my thinking being that it’d work because a 9-speed chain is wider?

    I’ll probably go 11-speed on the bike (or a replacement) at some point but don’t want to do that now as it’ll mean replacing the wheels.

    Posted 7 years ago
    neilsonwheels
    Free Member

    I believe the ring spacing will be different. It would run but it wouldn’t be pretty.

    Posted 7 years ago
    dovebiker
    Full Member

    The chainring spacing between inner and outer will be marginally smaller (<1.0mm) which means that you might experience more chainrub when on inner ring and smaller sprockets – not a good idea anyway, plus there might be a bit more transmission ‘noise’ due to slightly wider chain on chainrings but if you’re not super-fastidious about how your bike runs, I’d doubt you’d notice.

    Posted 7 years ago
    epicsteve
    Free Member

    As an alternative any idea if an 11-speed 105 left hand crankarm will fit on 9-speed Tiagra chainset?

    Posted 7 years ago
    neilsonwheels
    Free Member

    As long as it’s a HT2 crank you’ll be fine.

    Posted 7 years ago
    epicsteve
    Free Member

    To answer my own question – I ended up just getting the fitting the 4iiii 105 arm to my Tiagra chainset and that seems fine.

    Next question though – does that mean I could also fit that 105 arm to the M960 XTR chainset on my Epic if I fancied trying the power meter on the occasional (dry!) off-road ride?

    Posted 7 years ago
    cynic-al
    Free Member

    Try it, if it bolts up ok it’ll probably work.

    I think chainring spacing doesn’t get narrower with narrower chains and more gears, the just widen the base of the chainring to stop the chain falling between them.

    Posted 7 years ago
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