Proprietary hollow carbon arms with industry standard 30mm alloy spindle for XC Race and Trail bikes 120mm or less Versatile Cinch system offers interchangeable spiders, limitless ring combinations, swappable width 30mm alloy spindles, and full compatibility across all relevant frame standards *BB sold separately, use RF291* for English 68/73mm, BB92 or PF30 BBs BB spanner sold separately, use RF2997 Direct Mount ring attaches using a Park BBT22 tool (use PK-5823, sold separately) Designed, tested and manufactured in Race Face's Canadian facility 445g (32T Direct Mount, without BB)