20x1-1/8" - 1-3/8" Twitch Ultra Light TPU Presta Valve Inner Tube Cream This bottom bracket is designed

This bottom bracket is designed to fit 73mm bottom brackets

It features  MPC

while still fitting in most modern frames

With the help of world champion BMX racer Caroline Buchanan

20x1-1/8" - 1-3/8" Twitch Ultra Light TPU Presta Valve Inner Tube Cream This bottom bracket is designedTwitch Ultra Lightweight TPU tubes weigh 6070% less than standard butyl tubes. Less weight at the wheel means faster acceleration and better performanceperfect for racers and serious BMXers. TPU's smooth surface reduces friction, so your bike rolls faster and more efficiently than with butyl tubes. This tube folds down to pocket size making it ideal as a spare tube to carry on the trail or track. The material also resists cuts and pinch flats better