The B.O.R. XM557 Basic is the crank-base, or the "carrier" for all possible crank-variants. The cranks received physical improvement of all parts, including spindle, lock nuts, lock ring and especially the arms. As a result, the arm-pair incl shaft/spindle and all small parts is running at just 460 grams. And thanks to the "Smart Spindle System" allows the crank platform now installed in 11 different bottom bracket types!
Smart Spindle System
- Fully CNC machined (Light Alloy 7022/7010/7051), anodized with noble laser-Logo
- Crank arm lenght: 175mm - 165mm, 170mm and 172.5mm at request
- Q-Factor: 164mm
- U-Factor: 147mm
- K-Factor: 96mm
Developed in cooperation with Tune 2012, 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.
Overview of all compatible bottom bracket types:
BSA68 / BSA73 / BSA73 MTB eType / ITA70 / BB30/73 MTB Cannondale / BB85/84,5 MTB Specialized / PF30/73 MTB / BB386EVO/91,5 MTB PRESSFIT / BB Right/84 MTB PRESSFIT / BB92/89,5 sym. MTB Pressfit / BB92/92 asym. MTB Pressfit
The specific bottom bracket is available separately.
Smart Drive-Train 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!
Spindle length, chain line, K-factor and Q-factor of this crank was designed for regular CrossCountry-, Marathon and AllMountain Frames! These usually have a rear dropout clearance of 135-148 mm.
The XM557 cranks are only suitable for CrossCountry-, Marathon and AllMountain
riding, and NOT
for Downhill or Enduro!
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.