1 bike is set up w/ 36/46 rotor rings up front and in the rear 12-27, one is 38/45 up front w/ 12-27 rear, another is a 42 single up front w/ 12 -28 in rear . and the last is 42 rotor in front w/ 11-32 in rear. which two bikes i bring to a race depends on the weather and the coarse (flat mid-atlantic, hilly new england)