With a heavy duty structure and versatile clamping capability of 10" to 24" (22" external), the megamount 503 Racing offers an incredible price / performance ratio, and this brand new 2014 model boasts an increased column height and bead breaker opening to enable it to handle rims up to 15" wide. The inclusion of our famous 'megafit 2' robotic assist arm ensures full capability with ultra-low profile and run-flat tyres.