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FSA SL-K Carbon Crank Arm Set – 170 mm, Direct Mount

Matte UD carbon direct mount crank arms from FSA's SL-K range for single-ring builds – supplied without chainring or belt sprocket.
SKU: CKM-OS8330/DM/86
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14-day refund
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Three years warranty

The FSA SL-K Carbon Crank Arm Set is a pair of 170 mm carbon-fibre crank arms with a matte UD carbon finish and a direct mount interface for single-ring (1x) builds – supplied without chainring or belt sprocket, so you choose the ring or the Gates Carbon Drive sprocket your bike needs.

SL-K crank arms at a glance

ModelFSA SL-K carbon crank arm set, left and right arm
Manufacturer codeCKM-OS8330/DM/86 (as printed on the supplier's packaging label)
SeriesSL-K
Crank length170 mm
Material and finishCarbon fibre, 50% matte UD carbon, black
GraphicsSL-K, black and silver
Ring mountDirect mount
Intended useSingle-ring (1x) drivetrains
Chainring or sprocketNot included

Why direct mount?

  • No spider, no chainring bolts. The ring or sprocket mounts straight onto the crank arm: fewer parts and nothing that can work loose.
  • Free choice of ring. Fit a direct mount chainring for a single-speed or 1x chain drive, or a Gates Carbon Drive direct mount sprocket for a belt drive.
  • Easy to change later. Want a different gear ratio? Swap the ring or sprocket and keep the cranks.

Who is it for?

  • Belt-drive builders. Who want carbon arms under a Gates Carbon Drive direct mount sprocket.
  • Single-ring builders. Setting up a single-speed, gear-hub or 1x bike with a direct mount chainring.
  • Riders upgrading from aluminium. Who want carbon-fibre crank arms with a matte UD finish.

Frequently asked questions

Is a chainring or belt sprocket included with the FSA SL-K carbon crank arms?

No. The set contains the left and right crank arms only. Choose a direct mount chainring or a Gates Carbon Drive direct mount sprocket separately.

What does direct mount mean on a crank?

On a direct mount crank the chainring or sprocket bolts or locks directly onto the drive-side crank arm instead of onto a separate spider. That saves parts and makes it quick to change the ring.

Are these crank arms for a single ring or for a double crankset?

They are intended for single-ring (1x) use. They are not a double or triple crankset.

Can I use the carbon crank arms with a Gates Carbon Drive belt?

Yes, with a Gates Carbon Drive direct mount front sprocket. Gates belt drives run without lubrication.

About FSA

FSA – Full Speed Ahead – has made bicycle components since 1993 and moved into cranksets and chainrings in 1995. FSA introduced the compact road crankset in 2004. In its catalogue FSA describes the SL-K line as a combination of low weight, strength and advanced technology for serious riders, and FSA parts are fitted as original equipment by many bike brands.