The Millennium Stadium in Cardiff hosts its 14th consecutive FIM British Speedway Grand Prix in 2013.
Never been to speedway? Don't worry, it's simple to follow. Four riders keep turning left over four laps of an oval track and each race is over in less than a minute. Easy! but not for the riders. They race 500cc single-geared machines with no brakes.
Speedway bikes have no brakes and are powered by 500cc engines manufactured by either Jawa of the Czech Republic or GM of Italy.
The engines are single cylinder, fixed gear power units, fitted into the chassis of the bike frame horizontally and fuelled by methanol. The engine makes up the major weight of the bike as there are few other parts to the machine. They are not allowed to weigh less than 80 kilogrammes.