How a bobsleigh run really unfolds: push, load, ride, brake — plus the real differences between two-man and four-man in weight, speed and format.
A bobsleigh run has four sections: roughly 50 metres of pushing in about five seconds to over 40 kph, loading into the moving sled, around a minute of riding the ice track with peaks above 150 kph — and the brake after the finish line [4]. The difference between two-man and four-man is mainly mass and personnel: two instead of four people, and in competition up to 630 instead of 390 kilos total weight [2].
What surprises many: the bob keeps accelerating for almost the whole run — going downhill it gains speed even though nobody is pushing any more [4]. The brake exists for the outrun, not for the corners. Once you are in, you no longer influence speed — only the line.
The stage is standardised enough to be comparable and still different everywhere: Olympic tracks are usually around 1,200 to 1,400 metres long; across all tracks competition length ranges from roughly 700 to 1,800 metres, vertical drop from 40 to 150 metres and curve count from 6 to 20 [3]. That is about the length of a fast 1,000-metre run — except you cover it in under a minute.
And because bobsleigh is a timed sport: at the Olympics and World Championships teams run four heats over two days, two per day, and the aggregate time counts to the hundredth of a second [1]. World Cup events usually have two heats.
The crew drives the sled out of the start block and accelerates it over roughly 50 metres to more than 40 kph [4]. Four people push in the four-man, two in the two-man — which is why four-man sleds end up faster despite the extra weight. This is where the start time is made, and friction dominates here: at low speed aerodynamic drag barely matters [5].
One after another everyone jumps into the moving sled, back to front, and pulls in the push handles. Sitting low and clean is not a style question: crew position measurably influences aerodynamic drag [5]. The best push is worthless if loading slows you down.
Now only the pilot works. Rope pulls adjust the movable front runners minimally [2] — this is about centimetres, not steering movements. As speed rises the balance of forces shifts: for a streamlined bob, roughly 40 per cent of losses are attributed to ice friction and the remainder to aerodynamics [5].
Only past the timing beam does the brakeman pull the brake lever and bring the sled to a stop in the outrun. There is no braking during the run — any braking would cost time and compromise control.
At the Olympics and World Championships, the sum of four heats over two days decides, measured to hundredths [1]. That is why bobsleigh is so merciless: a mistake in heat one follows you all the way to heat four.
The ice track is high-risk terrain: a bob exceeds 150 kph [4], and federations report around 5 G in the hardest curves — comparable to a very intense rollercoaster (practice figure, not a study measurement). This guide explains the sequence, it does not replace training: push, loading, riding and braking are learned exclusively under the supervision of qualified coaches and with an approved sled.
There is no do-it-yourself version here — not with borrowed equipment and not on a track outside operating hours. If you want to experience the ice track once without starting a racing programme: guest rides in a four-man bob with a professional pilot run in Altenberg over roughly 1,000 metres with eleven banked curves at over 100 kph, and in Winterberg up to about 130 kph [6].
At the next televised race, do not watch the ride — watch only the start clock and the split times. You will see how often the team with the best start time still loses, and how rarely a team with a bad start comes back. The sport lives in exactly that tension: the push buys you time, the line keeps or wastes it, and across four heats [1] luck evens out.
In four phases: a push over roughly 50 metres in about five seconds to more than 40 kph, loading into the moving sled, around a minute of riding the ice track with peaks above 150 kph, and braking only after the finish line [4]. Steering happens via rope pulls on the movable front runners [2].
Personnel and mass. The two-man carries a pilot and a brakeman; the four-man adds two push athletes. Weight limits including crew are 630 kilos in the four-man, 390 kilos in the men's two-man and 330 kilos in the women's two-man [2]. More mass and more push power make the four-man faster.
Olympic tracks are usually around 1,200 to 1,400 metres. Across all tracks, competition lengths range from roughly 700 to 1,800 metres, with 40 to 150 metres of vertical drop and 6 to 20 curves [3]. Every track therefore has its own speed and curve profile.
At the Olympic Games and World Championships, four heats over two days, two per day; the added aggregate time counts to the hundredth of a second [1]. World Cup events usually run two heats. Start order follows rankings and interim standings [1].
Because any braking costs time and compromises control. The bob keeps accelerating for almost the entire run [4]; the brake is intended solely for the outrun after the finish line. Steering happens instead through minimal deflections of the movable front runners [2].
Why it is not working: from symptom to cause in bobsleigh — push, loading and the head afterwards