The cycling industry's canned reaction to introductions of new standards--especially those of the bottom bracket variety, are usually met with a mix of head-scratching and a heavy dose of skepticism. The EVO 386 from FSA was no different, but a closer inspection reveals a carefully engineered answer to alleviate some of the more nitpicky issues found with the BB30 platform. The FSA SL-K Light EVO 386 Crankset connects you to FSA's new 386 BB standard, while delivering prime stiffness and drivetrain power transfer--both hallmarks of the SL-K Light series.
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 standard 39/53 gearing. Please note that while the bottom bracket is not included, we do have them available for purchase separately.
|FSA SL-K Light Compact EVO 386||$330.00 - $550.00|
|FSA K-Force Light 386Evo Crank||$377.00 - $580.00|
|FSA SL-K Light 386 EVO Crankset 34-50t 10 Speed 175mm Bottom Bracket Not Included||$549.99|
|FSA SL-K Light 386 EVO Crankset 34-50t 10 Speed 172.5mm Bottom Bracket Not Included||$549.99|