Wheels Manufacturing Angled Spacer Single Speed Conversion Kit is a Shimano- and SRAM-compatible single speed conversion kit with ramped spacers. Additional spacers are included to dial-in chainline. Includes: – (2) – 9mm angled spacers – (6) – 3mm spacers – (2) – 1mm shims – (1) – lockring – (1) – 16t cog Compatible with: – Any 1/2 x 1/8 pitch chain, this includes BMX and Track chains – Any 8 or 9-speed chain * Does not work acceptably with 10 or 11-speed chains