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Surly Splined Single Speed Cog Surly Splined Single Speed Cog
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Splined Single Speed Cog

Mfg PartNum:
  (5 customer reviews)
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Single up.

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.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Mfg PartNum: FW2076 


Cassette Type: Freewheels/ Fixed Cogs 

Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Best built cog available.
by Anonymous

I would never use aluminum again. These are the ony way to go for serious single speeders

Reviewed 3/2/2019
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Very Nice
by Anonymous

One of the best options(for price) for single speed cogs, these cogs have a large enough surface area which helps avoid eating into freehub bodies.

Reviewed 6/1/2015
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SS cog to rule all other cogs
by reylloc
Cycling Enthusiast

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.

Reviewed 1/15/2021
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My Go-To Cog
by EdT
Cycling Enthusiast
Los Angeles
1 of 1 customers found this review helpful.

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.

Reviewed 11/26/2020
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Surly makes great gear
by rmictks
Competitive Racer
Wichita Kansas

Installed this on my KONA Private Jake to make it SS. runs quit and smooth.

Reviewed 3/15/2021
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