Since you're running Mavic 2013 UST wheels, you're going to need a Round UST Valve Kit for the next time you lose a UST valve. Whether you were fixing a flat at home or on the trail, accidents happen. That's why we always have one in our repair kit. The UST Valve Kit works with rounded SLR, ST, and SX rims. It includes rubber O-rings and the appropriate valve caps.