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Item # FSA0256

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Item # FSA0256


Innovation in the cycling industry is something of a double-edged sword. On one hand, it spurs the development of new and exciting technologies that genuinely improve the sport we so dearly love. On the other, it runs the risk of creating a dizzying array of unnecessary standards that accomplish little more than confusion and derision before petering out. Luckily, the latter does not apply to FSA's new EVO 386 bottom bracket platform--a genuine improvement over BB30 that offers frame manufacturers the means to further innovate on frame designs that potentially improve overall ride quality and frame performance. The FSA SL-K Light EVO 386 Compact Crankset connects you to this new bottom bracket standard, while delivering prime stiffness and drivetrain power transfer--both hallmarks of the SL-K Light series, in a gear ratio capable of manhandling the most fearsome KOM challenges you may encounter.

Among the benefits of BB386 is the larger diameter, and its stiffer spindle. At 30mm, it's the same diameter as a BB30 spindle. The big difference between them is that the BB386 spindle is longer to allow its use in a bottom bracket shell width of 86mm. In allowing for greater shell widths, frame manufacturers have more leeway in creating stiffer and more durable drivetrain platforms. With this crank spindle, FSA uses a low speed extrusion to form the 7075 alloy spindle before they machine it to its final shape. It is co-molded into the 5-arm spider on the drive side arm. The composite spider is hollow to save precious extra grams, as are the crankarms. FSA molds a transverse rib into each hollow crankarm. It's an exacting process, but worth it since it increases the torsional rigidity -- you'll appreciate the rock-solid feel when you stomp on the pedals.

The FSA SL-K Light EVO 386 crankset differs from its K-Force Light only in that of aesthetics, and bearing fitment. The K-Force Light is fitted with FSA's silky smooth ceramic bearings, while this SL-K Light comes with standard steel cartridge bearings--certainly no slouch in their own right, however. In terms of weight, roughly 30 grams separate the two cranksets, and the slightly heavier SL-K Light has more subtle FSA branding on the arms. The unidirectional carbon on the SL-K crank gives it a silky appearance, in contrast to the woven outer layer on the K-Force Light unit.

Both cranksets use the same mold shape. So technically, the performance attributes of the hollow carbon fiber crankarms of both the SL-K and K-Force models are most likely identical. If there's a difference in stiffness, it's measurable in the lab, not out on the road. The other major aesthetic difference is in the 5-hole chainrings. The SL-K features Storm Grey anodized 7075 aluminum where the K-Force Light uses black. Other than the color, they are identical. Though more difficult to produce , T-30 Torx internal wrenching alloy fasteners are used for the chainrings bolts to ensure strip-free, proper torquing of the hardware. A tight fit and snug fasteners means less power-robbing flex and decreased chance for strange creaking noises to develop.

Three crank arm lengths are available -- 170, 172.5, and 175mm in a compact 34/50 gearing. Please note that while the bottom bracket is not included, we do have them available for purchase separately.

Tech Specs

Arm Material:
carbon fiber
Arm Length:
170 mm, 172.5 mm, 175 mm
Bottom Bracket:
not included
BB Type:
EVO 386
Recommended Use:
fitting with your EVO 386-compatible race machine

Size chart


Crankset/Bottom Bracket compatibility - Road

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Here's what others have to say...

5 5

Awesome Crank Set

  • Familiarity: I've put it through the wringer

This came stock on my Cycle Cross Bike , I love this Crank Set! Light weight , stiff and smooth. I have been really happy with the SL-K light , I have put over 5,000 miles on these guys and they are still going strong. I have worked in Bike shops over the years and from time to time we see folks that shear off their metal cranks or bend them. That is not an issue with these cranks , they are on sale now currently for a killer deal. They only weight 921 Grams and the stiff and smooth power of these cranks makes every pedal stoke effortless. They have a little minor wear on them , but are ready for an other 5,000 miles or more.

Awesome Crank Set
Unanswered Question

Will this fit a bottom bracket of 68...

Will this fit a bottom bracket of 68 english? I currently have an FSA mega exo BB on it. Running dura ace 7800. Thanks

I have a Stevens Team Carbon with a threaded...

I have a Stevens Team Carbon with a threaded BB currently using a Shimano cx-70 crank. With the proper cups e.g., FSA Megaevo, will the FSA SL-L light compact EVO386 work with my frame? Thank You. Don

Responded on

This BB386 crank will only fit 386 frames so no on the Stevens or anything with a threaded BB

Will these FSA cranks work with my Scott...

Will these FSA cranks work with my Scott Foil? I believe it has a BB86.

Responded on

Sorry, the 386 crank will only work with BB386 specific bottom bracket shells. You will need to run a standard Shimano or Sram GXP crankset with your set up.

I have two questions: 1. Will the FSA...

I have two questions: 1. Will the FSA SL-K Light Compact crankset work with the FSA 52 front and 36 inner chain rings? I want to make a mid-compact. 2. I have Shimano Ultegra Di2 group, set up on a Wilier Cento 1 SR frameset. Will the FSA SL-K Light Compact EVO 386 work with the Di2 Derailleur shifting?

Unanswered Question

I have actually an FSA/SL-K Light...

I have actually an FSA/SL-K Light 39/53 gearings (130 mm BCD). Is it possible to change only the outside and inside gearings to switch to a compact 34/50 gearings and keep my actual crankset that is working fine?