One of the most exciting and distinctive rowing events at the University of Cambridge is the Cambridge Bumps. This fascinating and historic competition is a highlight of the Cambridge rowing calendar, bringing together students from across the university’s many boat clubs. Unlike traditional regattas or side-by-side races, the Bumps have a unique format rooted in the constraints of the River Cam and a rich tradition dating back to 1827. But how exactly do the Bumps races work—and who tends to dominate?
The Bumps races are held twice a year—Lent Bumps in late February or early March, and May Bumps, usually in mid-June (despite the name). These are multi-day events involving consecutive races in which crews attempt to “bump” the boat directly ahead of them in a single-file formation.
Because the River Cam is too narrow for side-by-side racing, all participating boats line up along the river at fixed intervals (usually about 1.5 boat lengths apart). When the starting cannon fires, each boat rows as fast as it can to catch the one ahead and avoid being caught by the boat behind.
The Bumps races follow a multi-day progression system—not an elimination format. Over four days (five during Lent Bumps), crews start in order of their rankings from the previous day. The goal is to physically “bump” the boat in front. A bump results in the two crews immediately stopping their race, and the bumping crew takes the bumped crew’s position for the next day. If a crew rows the entire course without being bumped or bumping another, they achieve a “row over” and maintain their position.
At the end of the final day, the highest-ranking crews are awarded the coveted “Head of the River” title for topping their respective divisions.
The course for the Cambridge Bumps spans approximately 2 kilometers (about 1.25 miles) along a twisty, narrow stretch of the River Cam—typically between First Post Corner and Peter’s Posts. The tight turns and restricted visibility demand strong coxing skills, precision, and expert control. As in all rowing, the rowers face backward while the cox steers the boat.
Training for the Bumps requires a unique focus compared to standard regattas. Because of the unusual format and course conditions, crews concentrate on several specialised areas:
Close-Quarter Racing
Boats must row in tight formation, often within meters of each other. Crews practice starts, bursts of power, and rapid responses to changing water and race situations.
Timing and Synchronisation
Fast, efficient starts are critical. Teams drill coordination and rapid acceleration to either catch the boat ahead or avoid being caught.
Sprint Conditioning
With races typically lasting just 6–8 minutes, rowers train for short, intense efforts—building explosive strength, anaerobic endurance, and recovery capacity for racing on consecutive days.
Tactical Positioning
Coxes play a crucial role, guiding crews on when to make their move, how to conserve energy, or how to respond when being chased. Teams study opponents’ strengths and weaknesses to develop daily race strategies.
Mental Resilience
Bumps week is physically and mentally taxing. Crews practice mental focus, daily recovery routines, and team cohesion to handle the pressure and maintain performance across the entire event.
The top college in the Bumps is typically the one whose crews finish highest across all divisions. Lady Margaret Boat Club (St John’s College) and Caius Boat Club have been consistently strong in recent decades, regularly finishing near or at the top. Trinity, Jesus, and Downing have also had impressive runs, with competitive men’s and women’s squads.
However, dominance in the Bumps can shift yearly due to changing student cohorts, coaching quality, and investment in training. Smaller colleges also have breakout years and often climb the rankings, contributing to the dynamic and unpredictable nature of the event.
The Cambridge Bumps offer a thrilling spectacle unlike any other rowing competition in the world. Combining strategic racing, physical intensity, and deep-rooted tradition, the Bumps are a true centerpiece of Cambridge student life. Whether you’re an athlete, an alumnus, or a curious onlooker, witnessing boats race head-to-tail, chasing each other through narrow waterways, is an unforgettable experience and a celebration of collegiate rivalry at its finest.
