These bar-top levers are the sensible choice for Cyclo-cross 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, 26mm and 31.8mm handlebars.
Buy Cane Creek Crosstop Brake Levers from Chain Reaction Cycles, the world's largest online bicycle store.