Number 1 To fit 360-400mm (14.2-15.7 ) 112g Number 2 To fit 410-450mm (16.1-17.7 ) 120g Number 3 To fit 460-500mm (18.1-19.7 ) 130g Number 4 To fit 510-550mm (20.1-21.7 ) 140g Fits Presta & Schrader valves. Technopolymer body for strength and lightness. Reversible valve fitting. Fits directly between your bike frame tubes.