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Surly Single Speed Cog

Item #: CS409C06
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USD$30.00
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Surly's BMX / Singlespeed cogs fit the (common) splines of Shimano/SRAM and Shimano-compatible freehub bodies - thats virtually every MTB hub on the market today. Built of practically indestructible hardened chromoly steel, these cogs are ready to lick up what you dish out. Larger sizes include drillings to save weight.

  • Incredibly durable SCM-415 hardened chromoly steel
  • Designed for use with 3/32" (i.e., 8/9/10 speed) chains
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REVIEW SNAPSHOT®

by PowerReviews
Surly Single Speed Cog
 
4.4

(based on 20 reviews)

Ratings Distribution

  • 5 Stars

     

    (14)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (2)

94%

of respondents would recommend this to a friend.

Pros

  • Durable (10)
  • Easy to install (8)
  • Attractive (6)

Cons

    Best Uses

    • Mountain biking (8)
      • Reviewer Profile:
      • Avid cyclist (9)
      • Was this a gift?:
      • No (11)

    Most Liked Positive Review

     

    Solid Unit

    Intelligent design which includes being able to better align the cog with the chain line depending upon which side you have facing outward. Longer teeth help to minimize the incidence of slippage and maximize...Read complete review

    Intelligent design which includes being able to better align the cog with the chain line depending upon which side you have facing outward. Longer teeth help to minimize the incidence of slippage and maximize chain wrap. Larger sizes have been drilled (see picture) to reduce weight penalty. Mating surface of cog to free hub has a wider contact patch thus reducing the potential of shearing and damaging your free hub.

    VS

    Most Liked Negative Review

     

    lots of chain slip

    I bought this to get a faster ratio than my previous setup, but I ended up with a lot of chain skipping when accelerating to climbing hills. I tried two other chains (both...Read complete review

    I bought this to get a faster ratio than my previous setup, but I ended up with a lot of chain skipping when accelerating to climbing hills. I tried two other chains (both brand new), and tried a new tensioner. No change. The chain rollers like to ride up over the teeth on the sprocket, even with 180 degrees of chain wrap on the sprocket.

    Switching to an Endless rear sprocket solved the chain skip problem completely. Same chain, same tension, same amount of chain wrap, just no more skipping. I'm done with Surly sprockets.

    Reviewed by 20 customers

    Sort by

    Displaying reviews 1-10

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    1.0

    lots of chain slip

    By Delaminator

    from Duthie Hill, Washington

    About Me Avid Cyclist

    Verified Buyer

    Pros

      Cons

      • Poor Quality

      Best Uses

        Comments about Surly Single Speed Cog:

        I bought this to get a faster ratio than my previous setup, but I ended up with a lot of chain skipping when accelerating to climbing hills. I tried two other chains (both brand new), and tried a new tensioner. No change. The chain rollers like to ride up over the teeth on the sprocket, even with 180 degrees of chain wrap on the sprocket.

        Switching to an Endless rear sprocket solved the chain skip problem completely. Same chain, same tension, same amount of chain wrap, just no more skipping. I'm done with Surly sprockets.

        • Was this a gift?:
        • No
         
        5.0

        Good quality, good price

        By TXMTB

        from Dallas Texas

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Durable
        • Easy to Use
        • High quality

        Cons

          Best Uses

          • Mountain Bikes

          Comments about Surly Single Speed Cog:

          The Surly cog is a great buy, it has a nice wide body that won't tear up your freehub and it fits well.

          This does not come with a Singlespeed conversion kit, it is just the cog. If you are just converting be sure that you grab another pack that includes the full conversion kit with spacers and lock ring.

          • Was this a gift?:
          • No
           
          4.0

          Thick and Cheap

          By jamez667

          from Vancouver, BC

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Durable
          • Easy to Use

          Cons

          • Not 18
          • Not One Eigth Inch

          Best Uses

          • Commuting

          Comments about Surly Single Speed Cog:

          Only downside is that i couldn't find it in 1/8" other than that its perfect.

          • Was this a gift?:
          • No
           
          5.0

          Sturdy and good looking.

          By PhxMtber

          from Phoenix, AZ

          About Me Avid Cyclist

          Verified Reviewer

          Pros

          • Attractive Design
          • Durable
          • Easy To Install

          Cons

            Best Uses

            • BMX
            • Mountain Biking

            Comments about Surly Single Speed Cog:

            I put this on my SS MTB to make the gearing easier. So far I'm very please. No damage to any other parts, and the price was right.

            • Was this a gift?:
            • No
             
            5.0

            Great part from a great company!

            By Fishy

            from Mn

            About Me Avid Cyclist

            Verified Buyer

            Pros

            • Attractive Design
            • Durable
            • Easy To Install
            • Excellent Quality

            Cons

              Best Uses

              • Mountain Biking
              • Upgrade

              Comments about Surly Single Speed Cog:

              Bike I built came with a cheesy stamped cog and also wanted a little more gear. So went with this stout surly cog in a 21t to fit my needs. Excellent fit, not many miles on it yet but based on other reviews and surlys rep. Im sure it will hold up great!

              • Was this a gift?:
              • No
               
              5.0

              One gear is all you need-- this gear

              By Warren

              from Shreveport, LA

              About Me Avid Cyclist

              Verified Reviewer

              Pros

              • Attractive Design
              • Durable
              • Easy To Install
              • Lightweight

              Cons

                Best Uses

                • Mountain Biking

                Comments about Surly Single Speed Cog:

                Surley cogs are awesome. I got a 22 which I found out was too low when attackin uphill -- so I went to a 20 -- no more lost momentum. This is a great quality, solid cog with a wide base and compatiple with a broad range of hubs.

                • Was this a gift?:
                • No
                 
                5.0

                Exactly what you need

                By Kman

                from Bozeman, Montana

                About Me Avid Cyclist

                Verified Reviewer

                Pros

                • Attractive Design
                • Durable
                • Easy To Install
                • Simple

                Cons

                  Best Uses

                  • Downhill
                  • Mountain Biking

                  Comments about Surly Single Speed Cog:

                  Extremely easy and well built cog. Pair it with some spacers and it cannot be beat for an easy single speed conversion.

                  • Was this a gift?:
                  • No
                   
                  4.0

                  thick

                  By Mr Rob

                  from murphy NC

                  About Me Casual/ Recreational

                  Verified Buyer

                  Pros

                  • Durable
                  • Easy To Install

                  Cons

                    Best Uses

                    • Mountain Biking

                    Comments about Surly Single Speed Cog:

                    it is offset on one side like the others have said so it is thicker than normal where the freewheel goes through. I had to cut .082 off my outside spacer for it to fit but buying a spacer kit would probably work also but im a machinist so it was no trouble. It seems to be very strong and has a very positive engagment with the chain. its a cog theres not much else to say about it

                    • Was this a gift?:
                    • No
                     
                    5.0

                    Gets the job done / Looks great

                    By MTB Rob

                    from Redding Ca

                    About Me Avid Cyclist

                    Verified Buyer

                    Pros

                    • Attractive Design
                    • Durable
                    • Easy To Install
                    • Lightweight

                    Cons

                    • NONE

                    Best Uses

                    • Mountain Biking

                    Comments about Surly Single Speed Cog:

                    I own both the 18 and 19 tooth cog and run them on my Civilian Luditte. Availability of a 19 tooth / odd size cog is a plus.

                    • Was this a gift?:
                    • No
                     
                    5.0

                    BOMB PROOF COG

                    By T-Ride

                    from Michigan

                    About Me Avid Cyclist

                    Verified Buyer

                    Pros

                    • Attractive Design
                    • Durable
                    • Easy To Install

                    Cons

                    • NONE

                    Best Uses

                    • Mountain Biking

                    Comments about Surly Single Speed Cog:

                    The Surly cog is the only way to go in my book. Cheaper than a lot of other cogs, a heck of a lot stronger than aluminum cogs (I've sheared teeth off of two seperate aluminum cogs, will never go that route again) Nothing better than an all steel drivetrain for SS use. You can't go wrong with this setup.

                    • Was this a gift?:
                    • No

                    Displaying reviews 1-10

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                    Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

                    Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.