4/2 Grevillea St. Tanah Merah 4128 (m) 0412 782 111
Cart 0



Surly Single Speed Cassette Cogs are designed to fit on standard Shimano / SRAM 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. 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 13-22t, so you can select that perfect gear.

The starting point for gearing for most single speeding, is 2:1, which refers to the front chain ring being twice as big as the rear cog, like 32/16. It's usually the old middle ring when a triple crank is converted to a single front chain ring setup. So gearing it lower, using the same 32 front chain ring & going bigger on the rear, like a 20 will make it easier for climbing & tight technical sections, but a slower cruising speed. Gearing it higher will make climbing harder, but increase your cruising speed with less spinning.

It's a bit of a juggling act, choosing the correct gear & I guess that's why they invented gears, but where is the fun in that.

Some examples on Gearing:

  • High (using 32t Front Chain Ring & 15t Rear Cog)
  • Low (using 32t Front Chain Ring & 22t Rear Cog)

Hope you enjoy single speeding, it can be a lot of fun, either on bitumen or in dirt.

More from this collection