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Surly Singlespeed tensioner kit - BikeRadar
How-To: Singlespeed Conversion (in time for SSCXWC) - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media
Happy Earth, India on Twitter: "The single speed spacer kit from @surlybikes allows you to run a splined single speed cog on a cassette hub. Hub shown here is our home brand