Cassette Specification Question

ben@31
ben@31 Posts: 2,327
edited November 2015 in Workshop
Hi what is meant by

Total Capacity 31 teeth or less
Front chain wheel tooth difference 16 teeth or less.

I have a compact 50 x 34 t chainrings.

Thanks.
"The Prince of Wales is now the King of France" - Calton Kirby

Comments

  • keezx
    keezx Posts: 1,322
    Looks as a specification for a rear derailleur.
  • mitchgixer6
    mitchgixer6 Posts: 729
    +1

    Telling you that your rear derailleur can handle at the most a 31 tooth sprocket on the cassette. Also that the difference between the 2 front rings can't be more than 16 (which is what you currently have).
  • svetty
    svetty Posts: 1,904
    Not quite - the total capacity is the range in the number of teeth over which the rear mech needs to operate

    e.g. for your compact chainset the range is 50-34=16 - this then needs to be added to the range of your cassette to arrive at total capacity.

    If you have a 12-25 this would be 13 giving a total of 16+13=29. This would fall within the 31 of your mech and you'd be OK. If you have an 11-28 cassette then your total capacity would be 16+17=33 and this may or may not work as it exceeds 31 - you might be OK but might not depending on factors like chainstay length and B-screw adjustment.

    Comprende?
    FFS! Harden up and grow a pair :D

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