Use the Surly Single Speed Spacer kit to use single-speed cassette cogs on the freehub body of your multi-speed Shimano cassette-compatible hub.
• Set of five spacers for converting to singlespeed on Shimano freehub bodies
• 2.1mm, (2) 2.5mm, 5mm, 9.5mm, and 12mm anodized aluminum spacers
• Includes stainless steel lockring
• Compatible with Shimano/Sram 8-, 9- or 10-speed freehub body
• Weighs 45 grams