Challenge chicane open cyclocross tyredrill the straightaways with confidence knowing the chicane will carry you through sand, dust, snow or whatever the approaching corners throw at you'. '.strtoupper('t')he ultimate fast tyre with superior cornering traction.open tubular differ from traditional clinchers for the construction'. '.strtoupper('t')he tyre is produced just like a tubular and uses the same materials and production process'. '.strtoupper('i')nstead of being sewed with an inner tube inside, at the end of the process beads are made by folding the casing around aramid fibers threads'. '.strtoupper('f')or this reason an open tubular gives very similar ride feel of that of a tubular, mainly if a latex inner tube is used.mounting an open tubular on a wheel is the same as mounting a standard clincher but with the advantage of riding a much more comfortable and performing tyre'. '.strtoupper('t')his tyre is also designed to be super fast rolling with maximum control on dry hard pack, wet grass or even icy riding conditions.features use cross racing dry, grassy, dusty or icy conditions size 700 tyre width 33mm internal rim width 15 19mm tpi 300 bead aramid casing superpoly flat protection pps bar 2 6 psi 30 90technologies challenge handmade clinchers hcl our handmade clinchers are made from the same materials and processes as our handmade tubulars but instead of sewing an inner tube inside the casing is wrapped around an aramid bead to form a tire that fits on a clincher rim'. '.strtoupper('t')he hcl is moulded flat, not in a horseshoe like a tlr or vcl'. '.strtoupper('t')his shape allows the casing to naturally deform over surface imperfections and minimize rolling resistance'. '.strtoupper('a') tubeless tire is moulded in a u shape to make the sidewalls rigid, so the system does not “burp” or lose air when it deforms after it encounters a surface imperfection'. '.strtoupper('t')he tubeless tire's stiff sidewall compromises its ability to equal a supple hcl with a latex inner tube.buy challenge wheels tyres from chain reaction cycles, the world's largest online bike store.