Mavic xc421 disc mtb rimthe mavic xc421 rim is a simple fast and lightweight rim that is incredible value for money it is designed specifically for xc use and can be set up to run tubeless tyres this enables you to run lower tyre pressures increasing grip and reducing weight which lowers inertia and helps you to accelerate faster features material6061 aluminium alloy jointsleeved drilling traditional ust tubeless ready disc brake specific profile valve hole diameter 65mm etrto size