SRAM XO Front Hub Conversion Caps With XO Hubs' reliability, also comes their versatility. SRAM XO hubs can be easily converted to different axle types using these conversion caps. 9QR 19MM STANDARD Vendor part #: 00. 1918. 145. 000 UPC: 710845739200 Model: X0 Hubs, Roam30/40, Rise XX Wheel: front conversion description: 9x100mm QR (19mm cap) For SRAM Rise-40/60, Roam-50/60 and Rail-50 mountain wheels Rise-40 conversions require separate tool (GS-4593), where Rise-60 conversions are a tool-free design OS-Q/R (31mm diameter cap) conversion is only to be used with Rock Shox forks due to inside dropout compatibility 9QR 31MM ROCKSHOX Vendor part #: 00. 1918. 145. 001 UPC: 710845739217 Model: X0 Hubs, Roam30/40, Rise XX Wheel: front conversion description: 9x100mm QR (31mm cap) For SRAM Rise-40/60, Roam-50/60 and Rail-50 mountain wheels Rise-40 conversions require separate tool (GS-4593), where Rise-60 conversions are a tool-free design OS-Q/R (31mm diameter cap) conversion is only to be used with Rock Shox forks due to inside dropout compatibility | Sram | Front Hub Conversion Caps Front 15Mm Thru-Axle Mth 717