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Surly rings paired with 9 speed chains will have a tight fit
The design reduces what engineers call "splay force" sending energy into the brake instead of the frame and fork
Double or Triple Double Double or Triple Triple Front Der/Shifter Compatibility SRAM Mountain Rear Der/Shifter Compatibility Shimano Mountain Shifter Style Twist Drivetrain Speeds 8 Weight 120
Cryogenically treated 52100 chromium steel races
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Surly Track Cog 3/32'' X 17t Silver MFPN=SCH020288S0100 Surly rings paired with 9Surly Track Cog 3 32'' X 17t Silver. Surly track cogs are threaded the same as a BMX freewheel (1. 375 x 24 tpi right hand threads). This means that they will fit on single speed rear hubs as well as BMX freewheel hubs but this application is not recommended. Track cogs are meant to work on track hubs only. 415 hardened chromoly steel 1. 375" x 24 tpi Photo for color and material reference only TECH SPECS Tooth Count 17
