21 mm outer diameter

Machined in the USA from 6061 Aluminium and featuring the renowned Enduro black oxide coated chromium steel bearing

Twin head design for use with Schrader and Presta valves

Spring type: Debonair air spring

Rubber Side Down Unisex Trail Socks - S - Grey - Black netsuite-webdata-created 21 mm outer diameterWith only five contact points when you're on your bike, Rubber Side Down is dedicated to making two of them as comfortable as possible with their MTB Crew Trail Socks. Regardless of whether you are shredding on the way down or spinning on the way up the RSD MTB Crew Trail Socks have been designed to maximise your performance. Designed and manufactured in Australia, these socks are made with compression technology, and moisture wicking fabrics to keep