These bar-top levers are the sensible choice for Cyclocross bikes. They are designed to work in-line with traditional drop bar shifter/levers to provide additional braking control position on the top of handlebars. Crosstops are compatible with caliper or cantilever brakes. They are available in two different sizes to fit 26.0mm and 31.8mm handlebars. Construction: Machined aluminum lever and bracket (hinged for assembly ease). A neat 2.5mm hex bolt takes up tolerances in the pivot, assuring you of no "slop" in the lever action.