42/15 simplifies to 14/ 5, so there will be 5 skid patches.These may be fixed sprockets of different sizes, or one may be fixed, the other freewheeling.

Conventional wisdom: "a bicycle must be moving forward to keep its balance." Not so!This same feel for traction will help you learn exactly how hard you can apply your front brake without quite lifting the rear off the ground.

In addition, track bikes have very tight tire clearance, since there is no reason to use any but the narrowest tires on the track.It is also possible to modify other hubs to use with a fixed sprocket.For this reason, clip-in pedals and cleated shoes are preferable.