Shrewsbury is one of only two public schools to have bumps races, the other being Eton, between the houses. They are rowed over four evenings at the end of term in July. There are usually three boats entered per house. On the fourth evening there are prizes for the leaders of the chart and the Leadbitter Cup for the boat which has made the most bumps over the four nights. The event is marshalled by senior rowers and rowing prefects, usually masters. The crew training is mainly pupil driven, though in preparation for Henley the school's First VIII rowers often do not take part, and therefore the boats are composed of other rowers and some non-rowers. Previously, races were run every day until there were no more bumps (i.e. until they were nominally in speed order). This historical set-up could lead to weeks of racing and it was therefore abandoned in favour of a four-day version more than 100 years ago. Otherwise, it is only Oxford and Cambridge that continue to have bumps. Shrewsbury and Eton both race bumps in fours whilst Oxford and Cambridge race in eights.