Rotor ALDHU CARBON Kurbelarme

The completely newly developed ALDHU CARBON is more than just a lighter and stiffer crank from ROTOR

ROTOR opens up the world of modular ALDHU cranks with the new carbon option

The ROTOR Aldhu Carbon® is a new generation of super-light and stiff cranks with unique variability and upgradeability.
Our engineers have spent four years developing our new flagship to surpass the equally highly developed Aldhu made of aluminum. The result is a modular crank system with a significant reduction in weight and a significant increase in rigidity. Made from high-end carbon and beautifully finished, the Aldhu Carbon
a jewel on every bike. This allows weight increases caused by disc brakes to be elegantly compensated without losing the necessary rigidity.

How much lighter and stiffer is Aldhu Carbon?
ROTOR's first generation aluminum ALDHU® weighs just over 600 g with a 172.5 mm crank arm length and 50/34 direct mount chainrings, a top value for extruded and CNC-machined cranks. Utilizing the advantages of high-end carbon fiber, the new carbon crank arms save around 100 g and the total weight drops to 523.5 g!
At the same time, the absolute vertical and horizontal stiffness of the cranks was increased by 11% and 36.1% respectively.

Possible crank combinations
Every cyclist has individual demands on the comfort and performance of their equipment and ultimately these determine the riding experience and performance.
The ALDHU® carbon cranks can be equipped with different types of chainrings. Round or oval, via direct mount or classic with a spider and also in aero versions. Various axes make the crank compatible with almost every bike on the market and also fit perfectly into groups from other manufacturers. Even a power meter spider can be integrated into this modular infrastructure.
ROTOR has divided the possible crankset combinations into four categories: Standard, Superlight, Aero, and Full Aero with 1x and 2x configurations (Standard offers 2x).

Twin Leg Technology
ALDHU® carbon crank arms were developed in combination with ROTOR's 30mm axles. The patented interface between crank arms and axle offers easy assembly with a tight fit. The design solves a specific problem, namely preventing power losses caused by axle torsion under pedal force. ROTOR axles effectively reduce power losses. The balance achieved to minimize these losses is what we at ROTOR call

OCP Mount
OCP technology allows the rider to adjust the alignment of the oval ROTOR Q RINGS® chainrings relative to the crank in degrees. The OCP assembly is based on the combination of three independent elements: axle, right crank arm and spider or DirectMount Q RINGs®. The patented crank interface for DM Q RINGS® enables the most precise adjustment of an oval chainring to date.
This is the only way to really adjust an oval chainring to the rider's individual needs and pedaling technique and to bring pedaling efficiency, traction control and, above all, the reduction of joint strain to an optimal level.
Thanks to the modular design of ALDHU®, every rider can completely customize their crankset. ROTOR first included this concept in its range in 2017 and has continuously added additional components.

Upgrades for ALDHU CARBON
If you already have an ALDHU® or VEGAST® crankset, the ALDHU®Carbon upgrade only requires an 8mm Allen key and 2 minutes of time.
Even upgrading a ROTOR INspider power meter can be done in minutes and without any specialist knowledge. This new system offers precise power measurement, cadence, balance values ​​via two proprietary metrics, Torque 360 ​​data and the optimal chainring angle. This perfect and professional, but very easy-to-use combination allows you to optimize your drive yourself!

Spider or Direct Mount combination chainring – the choice is yours

The ALDHU Carbon is of course compatible with other road bike groups from Shimano, SRAM or Campagnolo and offers future-proof technology thanks to Direct Mount.

• Material: Carbon
• Crank arm length (mm): 165 / 170 / 172.5 / 175
• Bottom bracket: All 30mm bottom brackets
• Chainline: Standard: 43.5mm (1x), 44.5mm (2x) / Offset: 46mm (1x), 47mm (2x)
• Q factor: Standard: 147mm / Offset: 152mm
• Pedal thread: Standard 9/16"
• Crank arm weights: 260 g (172.5 mm)
• Color: CARBON