Section 1: Introduction
1.1 Overview and Governing Body
Bobsled (also known as bobsleigh) is governed by the International Bobsled and Skeleton Federation (IBSF), founded in 1923 and headquartered in Lausanne, Switzerland. The sport operates under the IBSF International Rules, updated annually. The IBSF also governs skeleton, making it the authority for two of the three Olympic sliding disciplines (luge falls under the FIL).
1.2 Olympic History
Bobsled has been part of the Winter Olympic programme since the inaugural 1924 Chamonix Games, making it one of the original Winter Olympic sports. The four-man event has been contested since 1924, two-man since 1932, women's two-woman since 2002 (Salt Lake City), and women's monobob since 2022 (Beijing). The sport was absent only from the 1960 Squaw Valley Games, where the organising committee deemed the cost of building a track prohibitive.
1.3 Discipline Overview
Bobsled is a gravity-powered sport in which crews of one, two, or four athletes pilot an aerodynamic sled down a purpose-built ice track. The sport combines explosive sprint power at the push start with the pilot's precision steering through high-speed curves. Top speeds routinely exceed 150 km/h (93 mph) in four-man events, with G-forces reaching 5G in banked curves.
Section 2: Equipment
2.1 The Sled
Bobsleds are precision-engineered machines constructed primarily from steel and fibreglass composites. Key specifications vary by event:
- Women’s Monobob: only the IBSF standardised Monobob provided by iXent is allowed at official IBSF races (Art. 10.8.1). Minimum sled weight 163 kg (359 lb); maximum with athlete and equipment 248.5 kg (548 lb) (Art. 10.14). All athletes use identical sleds, making the event about driving skill and athleticism.
- Two-man/two-woman: Minimum sled weight (with runners, without crew) 170 kg (375 lb). Maximum weight with crew, runners and equipment 390.5 kg (861 lb) for 2-man and 330.5 kg (729 lb) for 2-woman (Art. 10.14). Axle base 1,690 mm ± 30 mm (Art. 12.1.3.1.2).
- Four-man: Minimum sled weight (with runners, without crew) 210 kg (463 lb). Maximum weight with crew, runners and equipment 631 kg (1,391 lb) (Art. 10.14). Axle base 2,130 mm ± 30 mm (Art. 12.1.3.1.2).
Teams below the maximum may add ballast, which must be fixed securely to the sled; in Women’s Monobob only the additional weights provided by iXent are permitted (Art. 10.14).
2.2 Runners
Each sled rides on four steel runners — two front (steerable) and two rear (fixed). Runner specifications are strictly controlled:
- Material: steel to IBSF specifications, with a hardness not exceeding 385 Brinell (HB) or 400 Vickers (HV) (Art. 12.2.7.2)
- Runner gauge (centre to centre of opposite runners): 670 mm ± 1 mm (26.4 in), the same front and rear (Art. 12.1.3.1.1)
- Runner temperature: the runners on the sled may be at most 4°C (7.2°F) warmer than the IBSF reference runner; if the reference runner is below -14°C, the sled’s runners may be at most -10°C. If a reading is over the limit, both are measured again before the ice-bed, and a second reading over the limit means immediate disqualification (Art. 10.11).
- Runner profile: standardised profile templates are provided by IBSF; custom grinding is permitted within tolerance.
2.3 Crew Equipment
- Helmet: Full-face helmet mandatory in training and race heats, conforming to ECE, OKM or DOT safety standards; no aerodynamic elements may be added (Art. 10.16.1).
- Race suit: Must be made from uncoated textile; no aerodynamic elements may be attached outside or under the suit (Art. 10.16.3).
- Start shoes: Brush-form spikes, at least 250 per shoe, no more than 1.5 mm in diameter and 5 mm (0.2 in) long (Art. 10.16.2).
- Protection vest: All athletes except the pilot must wear a protection vest in training and competition; failure to do so means disqualification (Art. 10.16.4).
Section 3: Playing Area
3.1 Track Specifications
Bobsled tracks are purpose-built, artificially refrigerated ice channels. Track construction uses reinforced concrete with embedded ammonia or brine refrigeration pipes to maintain ice temperature. Key dimensions:
- Total length: 1,200–1,650 m (3,937–5,413 ft)
- Vertical drop: 100–150 m (328–492 ft)
- Average gradient: 8–15%
- Number of curves: 15–20, including at least one labyrinth (S-curve combination)
- Minimum curve radius: 20 m (66 ft)
- Wall height in curves: Up to 6 m (20 ft) in high-speed banked sections
- Ice thickness: 3–5 cm (1.2–2 in) on the refrigerated concrete surface
3.2 Start Zone
The push-start zone is approximately 50 m (164 ft) long with a gentle gradient of 2–5%. The surface is ice-covered, and crew members use spiked shoes for traction during the sprint. Electronic timing begins when the sled breaks the first light beam. Separate start positions exist for different events: four-man and two-man typically start from the top, while women's events and monobob may start from a lower position depending on the track.
3.3 Finish Area
The finish area includes a deceleration straight of at least 100 m with gradually increasing incline to slow the sled naturally. A mechanical braking area follows. Electronic timing beams capture finish time to 1/100th of a second. The finish zone must accommodate sled retrieval and provide safe exit for crew members.
3.4 Notable Olympic Tracks
There are fewer than 20 active sliding tracks worldwide. Notable venues include the Yanqing National Sliding Center (2022 Beijing), Alpensia Sliding Centre (2018 PyeongChang), Sanki Sliding Center (2014 Sochi), and the historic St. Moritz–Celerina Olympic Bobrun — the only remaining natural ice track used for international competition.
Section 4: Players & Officials
4.1 Crew Positions
- Pilot (driver): Sits at the front of the sled and steers using two D-shaped rings connected by cables to the front runner axle. Precise steering inputs determine the sled's line through each curve. The pilot is the only crew member who actively controls the sled during the run.
- Brakeman: Sits at the rear of the sled and operates the harrow-type brake (Art. 12.2.8.2) to stop the sled after the finish. The brakeman is typically the strongest pusher and loads last during the start.
- Pushers (four-man only): Two middle crew members who contribute to the push start and then tuck inside the sled. They provide additional mass and help stabilise the sled through weight distribution.
4.2 Crew Requirements and Athletics
Only athletes of the same nation, holding a valid IBSF license and registered for the competition, may form a team (Art. 10.1). In case of injury or illness, and with the Jury’s permission, any athlete except the pilot may be replaced by an athlete from the same National Federation; only the team that ran the final heat is ranked (Art. 10.6.5, changed in 2026). Monobob is a solo event requiring the pilot to push and drive alone. Each national federation may enter a maximum number of sleds per event as determined by IBSF ranking quotas.
Bobsled crew members are among the most powerful athletes in winter sports. Many are recruited from track and field (sprinters, shot putters) or American football due to the explosive speed and strength required for the push start. The 50 m push phase on ice demands a combination of top-end sprint speed and the ability to generate force against the sled while maintaining balance on a slippery surface. Elite two-man crews complete the push in under 5 seconds; four-man crews in under 4.8 seconds.
4.3 Officials and Jury
- Jury: Can interrupt or stop the race, for example for track damage or weather, in consultation with the Technical Delegate, the Race Director and the Chief of Track (Art. 10.6.10).
- Race Director: Organiser’s official responsible for running the competition.
- Technical Delegate: IBSF-appointed official who ensures compliance with all technical regulations, including sled inspection and runner temperature checks.
- Track Chief: Responsible for ice conditions, track safety inspections, and curve maintenance.
- Start referee: Supervises the push-start zone; no help from a third party is allowed during the start procedure (Art. 10.6.8).
- Timing officials: Operate the electronic timing system, recording the start time at 50 m, four intermediate times, and the finish time to 1/100th of a second (Art. 10.6.14).
Section 5: Rules of Play
5.1 Competition Format
In principle the Olympic Winter Games and World Championships are held over 4 heats; Continental Championships, Junior World Championships and all other official IBSF races, including the World Cup, are held over 2 heats (Art. 10.6.1). The combined cumulative time of all heats determines the final ranking. At least one heat must be completed for a race to be officially valid (Art. 10.6.1).
5.2 The Push Start
The push start is one of the most critical phases of a bobsled run. Crew members sprint alongside the sled for approximately 50 m on the ice surface, pushing the sled to build maximum velocity before loading in sequence. The pilot enters first, then pushers (four-man), and the brakeman loads last. Start time — measured from the first timing beam to a point approximately 50 m down the track — is a primary competitive differentiator. A difference of 0.1 seconds at the start can translate to 0.3 seconds at the finish.
5.3 Driving and Steering
The pilot steers using two D-rings connected by pulley cables to the front runner axle. Steering adjustments must be subtle — overcorrection scrubs speed by increasing friction between the runners and the ice wall. The ideal line through a curve enters high, crosses the apex at the lowest point, and exits high to carry maximum speed. Pilots study track geometry extensively and memorise optimal lines for each curve during training runs.
Different curve types demand different techniques. In a high-banked Kreisel (360-degree loop), the pilot must commit early to a high line and maintain steady pressure. In a labyrinth (rapid S-curve combination), quick transitions between left and right steering are critical. Straight sections between curves require the pilot to centre the sled and minimise runner contact with the walls, as even light wall touches create significant time losses. At 150 km/h, the pilot's reaction window is measured in milliseconds.
5.4 Braking Rules
The brakeman operates a harrow-type brake between the rear runners; only harrow-type brakes are allowed (Art. 12.2.8.2). It is used to stop the sled in the braking zone after the finish.
5.5 Monobob Specifics
The monobob event, introduced for the 2022 Beijing Olympics, uses the IBSF standardised Monobob provided by iXent (Art. 10.8.1). All pilots race in identical equipment, eliminating the technology advantage that wealthier nations enjoy in two-man and four-man events. The pilot pushes the sled alone from the start, loads in, and drives. Monobob push starts are shorter and slower than crewed events because a single athlete generates less force. The event has been praised for expanding access and making bobsled more equitable across nations.
5.6 Training Runs
Before the Olympic Winter Games and World Championships, 6 official training heats are offered (Art. 10.1.1). Each pilot must complete two training heats per discipline without accident to race; a pilot entered in both disciplines at a World Cup or Asian, Europe or North American Cup needs only one valid heat per discipline (Art. 10.1). Training runs allow pilots to learn the track geometry, test different steering lines, and build confidence at progressively higher speeds.
5.7 Start Order and Seeding
First-heat start numbers come from the IBSF ranking lists; at the Olympic Winter Games the 10 best-placed pilots present choose numbers 1–10 and the rest start from 11 in ranking order (Art. 10.6.3). In 2-heat races the second heat runs from 20 to 1 on the first-heat ranking. In 4-heat races, heats 2 and 3 run from 25 to 1 and then 26 to the end, and heat 4 runs from 20 to 1 on the standings after three heats (Art. 10.6.2).
5.8 Weather and Cancellation
The Jury, in consultation with the Technical Delegate, the Race Director and the Chief of Track, can interrupt or stop the race for reasons including track damage and weather (Art. 10.6.10). The number of heats may be reduced in cases of force majeure; at least one heat must be completed for the race to be valid (Art. 10.6.1).
Section 6: Scoring
6.1 Timing and Rankings
All times are recorded electronically to 1/100th of a second. The final ranking is determined by the cumulative total time across all completed runs. Times equal to 1/100th of a second are given the same rank (Art. 10.6.15).
6.2 Split Times
In addition to start and finish times, four intermediate times are recorded along the track, the first being the 50 m start time (Art. 10.6.14). These help analysts assess where time is gained or lost and are broadcast to spectators in real-time.
6.3 Tie-Breaking
Times equal to 1/100th of a second are given the same rank; ties are not broken (Art. 10.6.15).
6.4 World Cup Points
In the IBSF World Cup circuit, crews earn points based on finishing position (1st = 225 points, 2nd = 210, 3rd = 200, descending) (Art. 11.3). Cumulative World Cup points determine the overall season standings. From 2026, a team that does not finish the second World Cup heat receives at least the points for 20th place (Art. 11.3).
Section 7: Violations & Penalties
7.1 Disqualification Offences
- Runner temperature violation: a second reading above the limit over the reference runner means immediate disqualification (Art. 10.11).
- Rules violation found in technical inspection: automatic disqualification from the competition concerned (Art. 10.9).
- Runner polishing: only with IBSF-provided abrasives and with runners mounted on the sled; any other material or product means immediate disqualification from the race (Art. 10.9).
- Protection vest: any athlete other than the pilot without one is disqualified (Art. 10.16.4).
7.2 Start Violations
- Start window: after the track is cleared, the team must activate the timing within 60 seconds (Art. 10.6.8).
- Assistance: help from a third party during the start procedure is prohibited (Art. 10.6.8).
7.3 Weight
- Sleds must meet both the minimum sled weight and the maximum weight with crew in Art. 10.14; the observed weight is registered in the Weight Protocol, and no third-party assistance is allowed during weighing (Art. 10.14).
7.4 Protests
- A protest must be made verbally to the Jury immediately, or at most 5 minutes after the heat in which the incident happened, and its grounds submitted in writing no more than 20 minutes after the race ends; without the verbal protest no written protest is accepted (Art. 10.19)
- Only the team captain may protest; collective protests are not allowed. A €100 fee accompanies the written protest and is forfeited if it is rejected (Art. 10.19)
7.5 Behavioural Infractions
Unsportsmanlike conduct, interference with another crew's equipment, or failure to comply with official instructions may result in fines, suspension from subsequent races, or referral to the IBSF Disciplinary Commission.
Section 8: Safety Considerations
8.1 Track Safety Features
- Track walls are constructed of reinforced concrete with smooth ice surfaces to guide the sled. High-speed curves are profiled with steep banking to contain sleds under high G-forces.
- Overflow lips (raised edges) at the top of curve walls prevent sleds from leaving the track.
- Speed-reducing chicanes or deflection walls may be installed at dangerous sections if track speeds exceed design parameters.
- Run-off areas and deceleration zones are provided at critical points, particularly after high-speed curves.
8.2 Crew Safety
- Full-face helmets are mandatory for all crew members during training and competition.
- Each pilot must complete two training heats per discipline without accident before racing (Art. 10.1).
- Novice pilots must progress through lower-level IBSF licensing before competing at World Cup or Olympic level.
- G-forces in high-speed curves reach 4–5G, requiring crew members to brace with neck and core muscles to prevent injury.
8.3 Medical Provisions
A medical team with sled-mounted stretcher capability must be stationed at the finish area. Additional medical spotters are positioned at high-risk curve locations. A medical vehicle used as an emergency ambulance must be present (Art. 9.1). All crew members undergo mandatory medical examinations before each competition season. The Jury can interrupt or stop the race (Art. 10.6.10).
8.4 Crash Protocol
If a sled overturns during a run, crew members must remain inside the sled (or as close as possible) and allow the sled to slide to a natural stop. Standing or attempting to exit a moving overturned sled is extremely dangerous. Track marshals clear the track and assist crew evacuation. After a crash, the team is ranked only if it crosses the finish with the sled (Art. 10.6.5).
8.5 Environmental and Ice Conditions
Ambient temperature, humidity, wind speed, and precipitation are continuously monitored by track officials. Ice surface temperature is measured at multiple points along the track and recorded before each run. Warmer conditions soften the ice, increasing friction and slowing times, while extremely cold conditions can make the ice brittle and unpredictable. If air temperature rises above approximately 5°C (41°F), the race director may shorten the competition window or cancel runs to protect ice integrity. Fog and heavy snowfall can impair visibility and lead to race suspensions.
8.6 Sled Inspection and Anti-Tampering
Pre-race and post-race sled inspections are conducted by IBSF technical delegates. Inspections include verifying sled weight (with and without crew), measuring runner temperature with a contact sensor that stays on the runner (Art. 10.11), checking runner profile against IBSF templates, and examining the sled for unauthorised modifications. Runner polishing compounds are regulated, and teams may only use approved substances. Any crew found with prohibited heating devices, aerodynamic modifications, or weight concealment faces immediate disqualification and referral to the IBSF Disciplinary Commission.
