Competition Wheels The XRC 1501 is one of the best wheels for mountain bikers today. Its light weight and strong specs help cyclist pedal to the maximum on every tight corner and jump on the track. Tailored to the needs of performance orientated cross country riders, the XRC 1501 SPLINE ONE leaves nothing to be desired. The light 30 mm wide carbon rims offer ideal support for modern XC tyres. Rolling on race proven and super durable 240 hubs with RATCHET EXP freehub system every bit of your energy is transferred into forward motion via equally racy double butted spokes and a perfect wheel build.