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How to measure brake "size" ?

Discussion in 'The Shop' started by ryangt, Nov 5, 2009.

  1. ryangt New Member

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    Im trying to order some avids for my cannondale 29er but all the sites list a size option (120mm etc), im not sure what measurement that is for, can anyone help me out there? Is it cable length or something?
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  2. JustMtnB44 Member

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    The only variable in disc brakes is rotor size (diameter). The standard rotor size for most XC bikes is 160mm.
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  3. IH8Rice I'm Mr. Negative! I Fail!

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    and caliper mount size.
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  4. zebrahum New Member

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    hasn't this been standardized? We're probably not talking about a bike with chainstay Hayes.
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  5. ryangt New Member

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    the bike is a 07 cannondale 29er caffeine, i wasnt sure what the measurement was, disc size was my first guess, but i figured i should ask people who know, rather than just buying and hoping for the best. My worry was that rear bracket and making sure that lined up
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  6. zebrahum New Member

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    the number is just what rotor size you're looking for then
    #6