Rotor has devoted itself to a new line of mountain bike cranks it's calling "REX," and they are based on the same successful Trinity Drilling System as all Rotor cranks. The REX 1.1 is for a 1x drivetrain.
The Trinity Drilling System (TDS) is a method of hollowing out the cranks, which reduces weight and maximizes stiffness. Unlike traditional hollow crankset design, the Trinity Drilling System drills three channels from the pedal to the spindle. While these holes remove excess material, they also leave behind two thin walls, making them stiffer than the design of a single hollow chamber. The TDS creates a maximum strength-to-weight ratio, and the arms were constructed using a new 7055 alloy, which is both lighter and more durable than the more often used 7075.
UBB30 & UBB24 axles ensure maximum frame compatibility. Without the bottom bracket they weigh in at 489grams. The Q-factor is 163.
- Light and reliable cranks that refine alloy construction
- Trinity drilling system sheds material and weight
- CNC machining provides immaculate and accurate results
- Two thin inner walls elevate stiffness for snappy power
- Crafted from 7055 alloy for a lighter, more durable build