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How to measure brake "size" ?

ryangt

Chimp
Nov 5, 2009
8
0
Alice Springs, Australia
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?
 

ryangt

Chimp
Nov 5, 2009
8
0
Alice Springs, Australia
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