Surly's Splined Single Speed Cogs are machined from CroMoly and then heat treated and chrome plated for a durable and smooth finish for your single speed drivetrain. The teeth have a tall profile to help keep the chain engaged, and the spline width is a wide 4.35 mm that spreads the load over the freehub body to prevent gouging. It's also the same width as the spacing of a 9-speed cassette, so if you felt like it, you could build a little mini-cassette out of a few different sizes and use a 9-speed shifter and derailleur to change between them. Sizes 17T and larger are drilled out to save weight, and they're compatible with 6 - 9 speed 3 / 32" chains, but Surly recommends using a narrower 8 or 9 speed chain.
Spline pattern is for Shimano / SRAM freehub bodies.
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Mfg PartNum: FW2076
Cassette Type: Freewheels/ Fixed Cogs
Drivetrain Speed: Singlespeed/Fixed Gear
I built up a 20lb SS hardtail this summer and tried an 18 and a 20 tooth cog, b ut the 19 was other sweet spot. The Surly was best because not only did they make a 19, but it has a wider base so it cannot hurt the cassette carrier, as some of the other cogs were not so nice. Don't cheap out and ruin your free hub - and an aluminum cog wont; last long on a SS.
I have used Surly cogs for 12+ years on my MTBs. Cogs between 16t - 22t have equipped my bikes without issue. There are lighter, flashier cogs on the market but Surly cogs are strong and reliable plus their price makes them a very good value, full stop.
If you can afford those expensive, unobtainium cogs, go for it but Surly cogs are tough to beat.
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