Silencers are used to keep the bikes to a noise level of 96 decibels.
This is a rule throughout the world of speedway which every rider has to abide by. There are only two makes Jawa and King and 99 per cent of riders will use the King Silencer.
The dirt deflector was designed by Barry Briggs to ensure better vision for the riders at the back,during a race. It was also designed to keep the riders closer together and therefore to create more spectacular racing for the speedway fans and to keep dirt on the track rather than throwing it over the fence!