A handicap race in horse racing is a race in which horses carry different weights, allocated by the handicapper. A better horse will carry a heavier weight, to give. Around 60% of all of the races run in Britain each year are handicaps. Without them, the top horses would almost always win and there would be no point in. The speed at which any horse can gallop will always be affected by the amount of weight it is carrying. In a handicap race, horses are given.