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MDCC 10 mile TT Medium Gear Championships Thursday, 2nd September, 6.30 pm start. 

This will be held on Thursday, 2nd September on the Shurlock Row course. All riders who wish to enter this event are restricted to a 72" gear.  It is approximately  a gear of  48 * 18   but it will be checked by measuring  on the road.

I give below Andrew Small's information on medium gears.

 Hi Peter, these are the rules used in the national Medium Gear league:

The maximum gear allowed is 72", if you ride gears you must have them adjusted so a higher gear cannot be selected, gears will be checked at each event. A 72" gear was traditionally achieved using 48x18, however with modern smaller wheels and tyres a 49x18 is ideal and in some cases (19mm tyres) you can use a 52x19. The only way to be sure of your gear is to measure the distance travelled for one complete pedal revolution, this should be 18ft 10 1/4 inches. Remember if you are using a track bike with a single front brake you must have a lock ring securely fitted to the fixed sprocket.

Andrew.