Moved down the Aberfeldy a couple of months ago haven't been doing any road racing last two years but thinking about doing some events next year. Want to race birnam highland games grass track event on old fixie but have no idea what sort of gearing I should be using, never done any track racing. Currently got 50x18 been using to get to the shops and back. It's an elimination race, loss a rider every lap with a sprint for 1st, 2nd, 3rd and 4th. Any suggests appreciated.