Bobsleigh

The Sled
Each sled consists of a main hull, a frame, a front and rear axle and two sets of runners. The hull, also known as a cowling, is generally constructed of fiberglass and made of two separate sections. The hull is mounted on four runners. The rear part of the bobsleigh must be open.

Specifications

Two-man sled
Minimum weight (excluding crew): 170 kilograms
Maximum weight (including crew and equipment): 390 kilograms
Maximum length: 2.70 metres (8 feet, 10 inches)
Maximum width: .67 metres

Four-man sled:
Minimum weight (excluding crew): 210 kilograms
Maximum weight (including crew and equipment): 630 kilograms
Maximum length: 3.80 meters
Maximum width: .67 metres

Women's sled
Minimum weight (excluding crew): 170 kilograms
Maximum weight (including crew and equipment): 340 kilograms 
Maximum length: 2.70 metres
Maximum width: .67 metres

If the total weight of the sled, including crew, is less than the maximum weight, ballast may be added, though the athletes themselves may not carry any additional weight.

Runners
The runners must be made of a solid piece of steel and no plating or coating is allowed. It is not permitted to warm up the runners, or use any substance that improves sliding. At the start of the race, the temperature of the runners must be within four degree Celsius of the reference runner,
which is exposed to the open air for one hour before the start of the competition.

If a tested runner is too warm, the sled is disqualified. Warm runners are not allowed because the heat would decrease the friction between the runners and ice, making the sled faster.

Prior to the race teams if team wish to wipe their runners to remove impurities, they must use an official body of acetone that all teams share.

Steering mechanism
The driver steers the bobsleigh by pulling on two pieces of rope. These ropes are attached to a steering bolt that turns the front frame of the bobsleigh. Pulling on the rope in the right hand will steer the sled to the right; pulling on the rope in the left hand will steer the sled to the left.
The maximum turning angle for the front frame is 12 degrees.

Helmets
All competitors must wear helmets.

Shoes
The use of spikes on shoes is allowed provided the spikes are arranged like a brush. The top of the spikes may not be thicker than 1 mm. Spikes may not be longer than 4 mm and they may not be arranged further than 3 mm from each other.