The "Newcomers" class caters for riders who have no previous experience of the Mountain Circuit. Such a class does not feature in the programme of the TT and is thus the only opportunity for newcomers to race the circuit in competition. Classes are usually over-subscribed as a result. Riders are limited to machinery with a capacity not exceeding 750cc and must wear coloured bibs over their leathers during 'Practice' (see below). Newcomers are also permitted to submit an application for any of the other classes but may or may not be granted a ride depending on their levels of experience.