Muc-Off Big Bore Hyrid Tubeless Valve Stems - Large 45mm Blue Model-Dropout 561 1-inch hex drive at one

1-inch hex drive at one end and 16-notch 44mm bottom bracket tool (or centerlock rotor tool) at the other end

160 mm (front/rear)

and here are instructions on how to measure your BCD

from road to gravel

Muc-Off Big Bore Hyrid Tubeless Valve Stems - Large 45mm Blue Model-Dropout 561 1-inch hex drive at one245% higher air flow than traditional presta valves thanks to the straight through bore deisgn Precision CNC machined from 7075 aircraft grade aluminium Stainless steel ball valve with seals and O rings 4 way tyre insert air flow base is compatible with most tubeless inserts 4mm machined hex key slot for easy installation removal Available in 25, 35, 45mm valve stems to suit different rim depths TECH SPECS Valve Hybrid Valve Length 75mm