What bike? Bikes vary greatly,and a rack that fits one bike might not fit another properly. See what others who own the same bike as yours are using and go from there. Also helpful to go by local shops to do some test fitting.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line
