Discover Rotor components at Escapa to equip your bike with the best materials. TheRotor Rex 2.1 X1 172.5 crankset is top-quality , super-stiff, and lightweight. Aluminum crankarm and axle. The choice of Christophe Sauser and a growing number of Elite athletes. Thanks to the thicker axle (30 mm instead of 24 mm), there’s less risk of breakage and less stress on the bearings.
Rotor REX2 crankset set for Rotor Q-Rings or other chainrings with a 76 mm BCD. XX1
Suitable for 9-, 10-, and 11-speed drivetrains. Available in lengths: 170, 172.5, and 175.
Weight: 493 grams (including axle) with a 175 mm crank length.
- Rotor REX1.2 110/60 BCD dual ATB
- 30 mm axle, aluminum.
- Material: 7055 aluminum
- Comes with Rotor blade bolts.
The Technology Behind a Rotor Crankset
Rotor cranksets (except the 3D30 and REX2 series) are made from forged 7055 aluminum alloy. For the technical minds among us: This alloy is ideal for cranksets, offering the best combination of lightness and strength/stiffness. Consequently, the stiffest cranksets are made from this alloy.
Rotor cranks are also wider than most other cranks. This has the advantage of providing much greater stiffness. Again, for the technical minds among us: “A beam’s load-bearing capacity is largely determined by the height of that beam…” This same principle applies to the crank arm: the crank arm’s stiffness is determined by its width! While many brands create a tapered section in the crank arm to make it as lightweight as possible, Rotor takes a different approach:
To save weight, Rotor uses the Trinity drilling system. This means that each crankarm is re-drilled lengthwise using a special technique to shave off even more grams.
The Rotor Design
The industrial look of a Rotor crankset is immediately noticeable. This is what makes Rotor so special. It’s a gem on your bike—different from what everyone else has—and you want to show it off. You’re not only showing that you have good taste, but also that you choose technology, sustainability, and quality. With Rotor, you can upgrade your bike. That’s why even the top brands choose Rotor for their high-end bikes.
Rotor cranksets are available in two axle diameters: 24 mm and 30 mm. The 24 mm axles are compatible with the most commonly used bearings. For example, all Shimano cranksets have a 24 mm axle. Rotor’s 24 mm cranksets fit into these bearings.
Cranks with 30 mm axles (Rotor 3D30, Rotor 3D+, Rotor Inpower, Rotor 2INpower, Rotor Flow, Rotor REX1, and Rotor REX2) have a stiffer construction than cranks with 24 mm axles. The Rotor UBB (Universal Bottom Bracket) system allows 30 mm axles to fit almost any bicycle, except for Trek bicycles, which use a BB90 bottom bracket for which suitable bearings cannot be manufactured. Rotor has a suitable bearing for every bicycle.
