There is no minimum weight for a horse to be allowed to race in the Kentucky Derby. The weight of a Thoroughbred racehorse is typically in proportion to the horses overall build and fitness level.
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There is no official weight for a Kentucky Derby jockey. The weight is assigned to the horses. The amount of weight carried by colts in the Derby is 126 pounds. Fillies carry 121 pounds. If a jockey weighs less than either of those weights, then additional weight is added to the saddle of the horse to achieve the desired weight.
Jockeys need to be very light-weighted in order to increase the speed the horse can achieve during a race. The average jockey weights between 108 to 118 lb. (49 to 54 kg).
colts in the Kentucky Derby carry 126 pounds, fillies carry 121 pounds, so the minimum weight for a jockey in the derby is 121 pounds.