BOR Fatbike crank FB557 2X 170/177 SmartSpindleSystem 2x LK 104 | 64 chainring
The FB557 crank the German manufacturer BOR based on the proven XC666. However, changes and advancements let the weight of the FB557 continue tumbling down. In detail, this means a weight-reduced Lockring attached the also optimized Spider. Through the re-calculation of the crank arms additional grams were saved. The arms of the FB557 be attached to a rigid aluminum shaft with 30 mm diameter to meet even most powerful sprinter with excellent rigidity.
BOR typical system is the proven Smart Spindle is used, which allows the installation of the crank in almost any context. The modular system and a replaceable Spider allow rapid adaptation of the crank on even the most challenging.
The CNC machined chainrings BOR aluminum are as always hardened in a special process with a glass mount peening and then anodized with double the usual thickness. This Double Surface Treatment gives the leaves a significantly increased shelf life!
In conjunction with an SRAM or Shimano Shadow Type2 + derailleur, which have greatly increased bias of the cage, the chain is reliably held in place without chain guide.
The FB557 2X 170/177 is designed for frame constructed an RDS (Rear dropout spacing) of 170 or 177 mm. This means the rear hub has an installation width have 170 or 177 mm. The chain line and also affiliated tire clearance is optimal.
Made in Germany!
intended use: Fatbike
Material: alumnium (7022, 7010, 7051)
Crank arm: 170 mm, 175 mm (165 mm and 172.5 mm on request)
Shaft: 30 mm diameter
Q: 196 mm
Chainring spider: 2-fold with LK 104 | 64 mm
chain line: 65.5 mm
RDS (Rear Dropout Spacing): 170 or 177 mm
Chainring: 34 - 20, 36 - 22 and 38-24 or 40-26 teeth
Compatibility chain: 2x9, 2x10 and 2x11-speed
Color crank arms: black
Color Spider / crank bolt: black, orange, red, blue or acid green
Weights without bottom bracket:
590g 34-20 teeth
600g 36-22 teeth
610g 38-24 teeth
620g 40-26 teeth
Delivery: 2x crank arms, including wave, Locknut, Spider, 2x chainrings and chainring bolts..
Note: a frame corresponding internal stock must be purchased separately. All
Variations and more, you'll find in our extensive shop offer.