The Rotor REX 1.1 XC1 crank was designed with a 30mm axle, with performance and functionality in mind. It's being both lighter and stiffer than previous Rotor MTB cranks. The crank arms of the Rotor REX 1.1 XC1 are made of 100% CNC machined 7055 aluminium which have been trinity drilled for a further weight reduction. Because of the CNC machined and black anodized surface the Rex 1.1 is featuring an attractive finish in contrast to other crank. Rotor's axle systems has been specifically developed for multiple BB systems. In addition Rotor has extended the compatibility of the REX 1.1 XC1 because now it's featuring an improved ultra stiff 30mm aluminium UBB axle.
The "UBB System" is not a standard. It's all standards because it allows the installation of almost any 24 or 30mm Rotor axle crank on your bike, regardless of its BB type.
You will find a compatibility chart under "attachments"!
This crank is manufactured using an improved version of Rotor´s proprietary "Trinity Drilling System" technology during manufacture. Due to the larger axle-crank contact area of a BB30 crank, all three holes can be drilled from the axle side of the crank arm, allowing further optimization of wall thicknesses. It improves both the weight and the weight-rigidity ratio of the crank arm.
The Rotor REX 1.1 XC1 MTB crank can be used with Rotor QX-Rings (not included in delivery), noQ- Rings and also with any standard chainrings for 76mm bolt circle diameter.
The precisely adjustment of the cup pretension is achievable because of an compression ring with nut.
- Q-factor: 163mm
- chainline: 50,6 mm
The picture shows the crank inclusive chainring, while the delivery includes only