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OCA stands for Optimum Chainring Angle and is one of the proprietary metrics offered by ROTOR INpower and 2INpower. OCA is closely linked to ROTOR Q-Rings, as it helps to find the proper chainring setup.
OCA determines the angle in degrees, measured from the upper dead spot (with the cranks perpendicular to the floor) in which the effort barycenter (area enclosed by the torque/force curve) is shown in the TORQUE 360 graph.
Optimum Chainring Position (OCP) represents the different setup positions that ROTOR Q-Rings offer to fit a rider’s distinct pedaling style. Q-Rings feature up to 5 OCP´s, with OCP 3 as an intermediate starting point, all to optimize your pedaling style.
You can determine your OCP if you know your Optimum Chainring Angle (OCA), which can be found by conducting a TORQUE 360 pedal analysis via ROTOR´s 2INpower and INpower User Software.
ROTOR’s exclusive patented technology “OCP Mount” refers to the pedalling’s biomechanical optimization when you are using Q-Rings or other oval chainrings; this lets you adjust the orientation between chainrings and cranks by one step degree.
The shape of the axle lets you position independently both cranks and spider or Direct Mount, and thereby change the relative orientation in order to adapt to the optimum orientation of each user.
The multiple positions offered by “OCP Mount” technology let a fine adjustment of the OCP (Optimum Chainring Position), because so far you could position the Q-Rings in 5 exclusive OCP points, in 4 by 4 degrees, with a usual spider. In this way, with the OCP Mount technology, any oval chainring can benefit from an OCP with micro-adjustment to increase the performance of your pedalling and your knees health, or even to modulate the traction in MTB and Cyclo-cross.
Adjust perfectly your chainrings to your pedalling style with the ROTOR’s “OCP Mount”.
“MAS” stands for Micro Adjust Spider and means “more” in Spanish. That’s what this technology is all about: more adjustability to further optimize your Q-Rings. Additional bolt holes allow for intermediate positions between a Q-Ring’s existing Optimum Chainring Positions (OCP).
A standard crank and Q-Ring combination offers approximately 5 degrees of OCP adjustment. MAS together with Q-Rings offer half positions of approximately 2.5 degrees of OCP adjustment. This means you can micro adjust the orientation of your Q-Rings to fine-tune your pedal performance.
ROTOR´s CNC-machined cranks feature our Trinity Drilling System, which is a process that drills three full-depth holes along the axis of the crank.
This allows us to remove excess material from the crank arm resulting in a lighter crank without compromising its exceptional stiffness-to-weight ratio.
ROTOR’s Twin Leg Concept boasts the stiffest possible crankset by balancing the cranks’ left-to-right stiffness. There is no point in making an ultra-stiff right crank arm if the left crank arm doesn’t
measure up. By designing the cranks as a real set — not just two individual arms, TLC offers the most-balanced cranks possible.
Hydraulic Smart – By using hydraulics in a smart way, benefits gained include frictionless, smooth shifting activation, lightweight, and low maintenance.
Technology applied – Science added to help the rider
EU product – EU cycling and manufacturing expertise
Precision – Gear indexing is placed where it makes the most sense
What matters is inside
Multi-discipline power meter integrated inside the crank axle where it is protected from impact and external contaminants. Because power is measured in the left leg through two sets of opposing strain gauges placed in the axle, cyclists who already own a current set of ROTOR cranks can purchase the left crank arm independently.
Proprietary metrics TORQUE 360 and Optimum Chainring Angle combine with ANT+™ protocol metrics including cadence, torque effectiveness and pedal smoothness to provide precise data about your power output. INpower uses a standard AA battery, which can be easily replaced without tools wherever AA batteries are sold.
Double your data, strengthen your knowledge
Dual-sided power meter that measures power independently in each leg and accurately assesses force variations throughout a pedal stroke. Proprietary metrics TORQUE 360 and Optimum Chainring Angle combine with ANT+™ and Bluetooth® Smart protocol metrics including
cadence, balance, torque effectiveness and pedal smoothness to provide precise data about your power output. 2INpower’s rechargeable battery can last up to 250 hours and can be charged 300 times throughout its lifetime.
Allied against the wind
ROTOR Aero components, such as Aero chainrings or the flagship aero FLOW crank, help cyclists maximize their wattage output in the war against wind resistance.
Tapered FLOW crank arms optimize aero behavior, while a smooth, solid aero chainring surface reduces aerodynamic drag.
Manufactured with the latest technology
Computer Numerical Control (CNC) machining provides a precise and consistent manufacturing process. This is especially important when it comes to crafting bike components in order to ensure
flawless funcionality with respect to all the parts working together. Equipped with the latest CNC resources, ROTOR parts are precisely machined to within a hundredth of a millimeter.
Why we choose aluminum
7075 aeronautic-grade aluminum alloy offers superior physical properties with which to craft
components like our signature Q-Rings, REX 3 and 3D24 cranks.
To build the best cranks, we start with the best materials
7055 combines the superior physical properties of a 7000 alloy series with incredible fatigue resistance. Every single bar of raw material is checked by ultrasonic inspection to guarantee it free of internal
defects. 7055 is used to craft our 100% CNC machined cranks, like the FLOW, the 3D+, and the REX 1.
What you want in your forged cranks
6066 aluminum alloy’s weight-to-resistance ratio makes it the perfect
material for forged components, like the REX 2 and 3D30 cranks.
Weight, stiffness and strength – get all three
3K woven, high-modulus carbon fiber is bonded to the outside of a Q-Ring to reinforce the Q-Ring´s structure. Carbon fiber´s properties allow for weight
reduction in comparison with conventional aluminum chainrings. At the same time, the stiffer carbon fiber sheet offers increased lateral stiffness.
Compatibility that counts
Bluetooth® Smart (LE) is the power-and-application-friendly version of Bluetooth that was built for the Internet
of Things (IoT).
Easy data transfer via ANT+™
ANT+™ is the wireless technology that allows your ROTOR power meter to communicate with your
cycling head unit, and with the user software on your computer.