The baby limus 33 open cyclocross 700c tyre from challenge is a fresh new design for 2015 it features limus outer knobs to give good traction in the bends and lower faster centre line knobs for a more all around use the wide tread spacing gives good dirt and mud clearance the perfect formula for winners the open tubular version is made using superpoly casing with an aramid bead available in 700 x 33c only in black with a brown sidewall