Starting at 590 grams (34/20T) the FB557-2X is one of the lightest 2X Fatbike cranks on the market. It is designed for Fatbikes with a “Rear Dropout Spacing” (RDS) 170/177 mm and combines all the technical innovations of the 2015 “XM557 platform”, with all the advantages of the B.O.R "Smart Drivetrain Concept" and the "Smart Spindle System".
The FB557 2X is the synthesis of the FB557 Basic cranks as a “carrier” (490 g) and a mounted X0 drive-train unit (from 101 g) and results at just 590 grams. With its X0-compatible bolt cycle diameter (104/64BCD), it offers an unrivaled selection of transmissions and rings: 34/20 - 36/22 - 38/24 - 40/26
Rear Dropout Spacing (RDS)
- Fully CNC machined (Light Alloy 7022/7010/7051), anodized with noble laser-Logo
- “Scotching” (additional surface brushing)
- Crank arm lenght: 175mm - 165mm, 170mm and 172.5mm on request
- Chainline: 65.5mm
- Q-Factor: 196mm
- U-Factor: 179mm
- K-Factor: 128mm
- Bolt Circle Diameter (BCD): 104/64BCD; 4-arm
- For 2x11-speed,v 2x10-speed or 2x9-speed drives
Spindle length, chain line, K-factor and Q-factor of this crank was designed for Fatbikes 170/177 RDS (Rear Dropout Spacing).
Smart Drivetrain Concept
B.O.R. provide a versatile usability of the crank. Even regular with a spider or "Plug and Play"- power measurement on the spider. Thus B.O.R cranks are “Power Meter-ready” and enable the simplified retrofitting of measuring units from SRM and Power2Max!
Smart Spindle System
Developed in cooperation with Tune 2010, the “Smart Spindle System” serves as the basis for all B.O.R MTB cranks and secures for installing our cranks into 11 different bottom bracket types.
The specific bottom bracket shells are available separately.
Standard arm length 175mm - for 165mm, 170mm or 172.5mm please contact our service team.
A Shimano cassette tool (such as the Park Tool FR-5 Freewheel Remover) is required to mount the lock nut. The crank is supplied without a manual.