The zipp 30 course alloy tubular wheelset features a a wider rim profile with a 25mm external width incorporating design innovations from the 202 firecrest profile resulting in low aerodynamic drag and greater stability having a wider rim platform allows for increased air volume spreading the tyre casing helping increase the contact area with the ground improving cornering grip and ride comfort the zipp 30 course alloy tubular wheelset features the maintenance free 77177 hubset