Please check my Alfine maths

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  • Please check my Alfine maths
  • rootes1
    Member

    to speed things up:

    http://www.sheldonbrown.com/gears/

    has alfine 11 in the drop down

    cynic-al
    Member

    Sounds right.

    ChunkyMTB
    Member

    When is the 11 speed Alfine out? Or is it now?

    Premier Icon brassneck
    Subscriber

    I thought only 18 and 20t sprockets were actually available though?

    Mister P
    Member

    Alfine sprockets are only in 18 and 20T but you can use Nexus ones (no guides on them) which run from 16 to 23T.

    Premier Icon ChrisL
    Subscriber

    According to the Shimano web site the Alfine 11 has a ratio range of 0.527 to 2.153 and can take sprockets various sprockets with between 18 and 23 teeth.

    So, am I right in thinking that (for example) if an Alfine 11 was set up with a 32t chainring and a 23t sprocket you’d get a ratio range of 0.733 (0.527 * 32 / 23) to 2.995 (2.153 * 32 / 23)?

    In comparison a 2×9 gear setup with 22/33 chainrings and a 11-34 cassette would have ratios from 0.688 (22/32) to 2.909 (32/16). So it would have a wider range, but only just.

    Have I got my maths the right way round here?

    What rootes1 said. ^^
    If you want to know anything about gearing, just put the numbers in and see how it compares with what you’ve already got.

    Premier Icon ChrisL
    Subscriber

    Thanks for checking my working. 🙂

    I only picked the 23t sprocket as it produced numbers that were easily comparable to the 22/32 & 11-32 ratios.

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