Hope Torque Cap Conversion: With the growing number of Rock Shox forks available featuring Torque Cap compatibly, Hope has produced 31mm oversized spacers. These are retrofitted to Hope Pro 2, Pro 2 EVO and Pro 4 hubs. Hope part #HUB485 for 15mm - Pro 2/Pro 2 EVO/Pro 4 - O/S Spacer Kit.