53 mm

The Box One Oversized 31.8mm Front Load Stem-1 1/8" are engineered for larger racers and designed specifically to increase front end stiffness. The stem is cold forged to take advantage of the greater strength that results from the process. Box has taken great care in designing all their stems, because while it might seem like the simplest of BMX parts, they know that it provides a vital part of the front end stiffness equation and is not to be overlooked. Bought new at a national, used for one weekend and swapped out the next week. Some minor wear from rubbing (shown in pics) but stem is largely unused and like new