The Splined Single Speed Cogs from Surly breathe new life into Shimano / SRAM freehub wheels. They're machined from CroMoly and then heat treated and chrome plated for a durable, smooth finish. Tall tooth profiles help chain retention, and the 4.35 mm spline width better spreads out the load on the freehub body to avoid gouging. The wide base of the cog also means several sizes can be mounted together and then shifted between using a 9-speed derailleur and shifter. Sizes 17T and larger are drilled out to save weight.
Compatible with 3 / 32" 6 - 9 speed chains, but Surly recommends the use of the narrower 8 or 9 speed chains.
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.
Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 1/15/2021
by reylloc
Cycling Enthusiast
Texas
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
SS cog to rule all other cogs
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.
Was this review useful to you?
Yes/
NoThank you for your feedback.
Reviewed 1/31/2022
by Anonymous
Cycling Enthusiast
Value Rating
Overall Rating
Great SS Cog
I have had great success with these Cogs for my SS bikes. I typically wear out most cogs quickly but these last me 1-2 years+ before they start showing wear.
Was this review useful to you?
Yes/
NoThank you for your feedback.
Reviewed 11/26/2020
by EdT
Cycling Enthusiast
Los Angeles
Value Rating
Overall Rating
2 of 2 customers found this review helpful.
My Go-To Cog
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.
Was this review useful to you?
Yes/
NoThank you for your feedback.
Reviewed 3/15/2021
by rmictks
Competitive Racer
Wichita Kansas
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
Surly makes great gear
Installed this on my KONA Private Jake to make it SS. runs quit and smooth.
Was this review useful to you?
Yes/
NoThank you for your feedback.
1 of 1 customers found this review helpful.
Very Nice
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.
Was this review useful to you?
Yes/
NoThank you for your feedback.
1 of 1 customers found this review helpful.
Best built cog available.
I would never use aluminum again. These are the ony way to go for serious single speeders
Was this review useful to you?
Yes/
NoThank you for your feedback.
Articles will open in new tab.
A guide to understanding and calculating bicycle gear inches.
