BOR crank FB557 1X 170/177 SmartSpindleSystem 1 times LK 76
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 that secures the optimized Spider. The crank arms have been calculated once again and could lose a few grams. The arms are mounted on an aluminum shaft 30 mm in diameter to meet even the most powerful sprinters with best Steigikeit.
BOR typically comes also the proven Smart Spindle System is used, which makes it possible to build the crank in almost any context. Furthermore, even the Spider can replace. The crank is therefore prepared for any future changes.
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 by a significantly increased shelf life!
The chainrings have specific narrow-wide teeth that prevent the chain may come off.
In conjunction with a 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 1X 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: 1-fold with LK 76 mm
chain line: 65.5 mm
RDS (Rear Dropout Spacing): 170 or 177 mm
Chainring: 30, 32, 34, 36 or 38 teeth
Compatibility chain: 10x or 11x
Color crank arms: black
Color Spider / crank bolt: black, orange, red, blue or acid green
Weights without bottom bracket:
550g 30 teeth
555g 32 teeth
570g 36 teeth
583g 38 teeth
Delivery: crank arm left / right shaft chainring spider, chainrings, Locknut
Note: a frame corresponding internal stock must be purchased separately. All
Variations and more, you'll find in our extensive shop offer.