Mavic xc621 disc mtb rimthe mavic xc621 rim is a simple efficient fast and lightweight rim designed specifically for xc use this is an incredibly strong and durable rim featuring single eyelet spoke hole reinforcements features material6061 aluminium alloy jointsleeved drilling traditional with single eyelet reinforcement ust tubeless ready disc brake specific profile valve hole diameter 65mm etrto size 584x21tss 27 5 622x21tss 29 recommended tyre sizes 13 to 27 tubeless