Surly 17T to 22T Cassette Cogs
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The Surly cassette-type cog are designed to fit on standard Shimano compatible freehub bodies. These cogs have a tall tooth profile that is essential for preventing chain skip from the extra torque a singlespeed drivetrain encounters.
Top Features of the Surly 17T to 22T Cassette Cogs
- Ideal for Single Speed use
- CNC machined hardened SCM 415 Cr-Mo Steel
- Shimano HG Spline, 9Spd spaced
- Large Anti-Dig footprint on cassette body
- Chrome Plated
- Cassette spacers supplied separately
In addition to being a stellar SS cog, the cog base width (where it contacts the freehub body) is 4.35mm, so you can stack a few of them up and use a 9-speed shifter for a simplified multi-speed drivetrain. This width also prevents it from ruining the freehub body as a result of digging grooves into it like skinny stamped cogs have a tendency to do. Surly cogs are machined from SCM415 CroMoly steel, then heat-treated for toughness and chrome-plated for surface hardening and enhanced chain lubricity. Our cogs will work with 6-9-speed 3/32" chains, although we recommend the inherently updated quality of an 8 or 9 speed chain. They are also available in every increment from 17-22t, so you can select that perfect gear.
Note: Teeth profiles are straight forward, making them ideal for Single Speed applications however, with no twists or ramps etc the gear shifting will not be as slick as with regular Shimano cogs when used in a multiple cog line-up.
Note: When used in non-9 set-up, additional Cassette spacers will be required to fill the cassette body.
About the Surly brand
Surly Bikes manufacture a wide range of bikes, frames, parts and accessories. Surly are based in Boomington, Minnesota USA and were established in 1998. The company aims to build solid, quality components for a reasonable price.
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Product Q & A
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Yes you will definately require spacers for converting your 9sp to a single speed. Try to buy a spacer kit with thin spacers so that the chain line is perfect if not close to perfect.
I hope this helps!
if you had 10 speed, the thickness of the cogs has to be smaller etc...
if you want to convert to single speed a 9 speed bike, then you'll need at least spacers to position the cog on the hub for the correct chain line. you might need a tensioner as well, but it's not compulsory and can be added later if you have problems with the chain slipping out of the cog all the time.
Would like to go to 22t for the hills (getting old) ha ha
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