PKT's 25mm 2.6 lb. Hollow Chromemoly Kid Kart Axle. Our new 970mm axle allows maximum track width when using the narrow kid kart hubs and wheels. The industry leader has improved once again! Reduce your rotating weight by up to 5 lbs. over solid steel axles. This axle replaces PKT 25-915-B2 & PKT 25-915-21.