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ROTOR Power Meters

ROTOR makes several different power meters. They are best known for their crankset power meters which they offer for road, MTB and track. They make the 2INpower, which measures both left and right leg power, as well as the single-sided INpower. The INpower is also sold as a complete crankset, however it measures left leg power only. ROTOR’s newest power meter is the INspider. The INspider is a spider-based power meter that works with most newer ROTOR cranksets. ROTOR power meters are accurate and dependable. All units feature dual ANT+ and Bluetooth SMART and come with a 2-year warranty.

Additional ROTOR Power Meters Info:


Cranksets: Installation is pretty straightforward assuming you have ensured compatibility with your current bike frame. These power meters are equipped with the UBB30 axle system, which makes them compatible with almost all standard frames in the market when used with the correct bottom bracket.

INspider: Set-up involves removing the current spider or chainring and installing the new power meter spider in its place, and bolting on a new chainring.

For both power meter types, plan on 30-60 minutes for installation.


Cranksets: ROTOR power meter cranks weigh around 500-750 grams depending on the model.

INspider: With the INspider, you are looking at about 150 grams of weight.

When considering weight, be sure to focus on added weight by taking into account the weight of the crankset or spider you are replacing.

Power Measurement

Cranksets: The 2INpower models measure power from both legs. They are also able to provide independent left/right power. The INpower cranks measure left leg power only and, like other left side power meters, double the value to determine total power.

INspider: This power meter measures power from both legs however it is not able to provide left vs. right leg power like the 2INpower.

Special Features

ROTOR cranks feature unique, direct mount chainrings. These rings bolt directly onto the crank spindle and are offered as a solid piece of aluminum. This makes them both strong and lightweight. If you like to run an oval ring, ROTOR has you covered there too. ROTOR power meters allow you to adjust your chainrings with maximum precision for optimized pedaling efficiency.


The 2INpower and INspider feature rechargeable batteries with approximately 200-250 hours of battery life. The INpower units use AA batteries with approximately 300 hours of battery life.

Communication Protocol

The ROTOR power meters transmit data via both ANT+ and Bluetooth SMART. This means you can use them with any bicycle computer, smart phone or tablet. You can also pair them easily with indoor training apps such as Zwift.


ROTOR power meters are accurate to within +/- 1.5%. This is on par (to slightly better) than the majority of other power meters on the market.

Cadence Detection

Like the vast majority of power meters on the market, these power meters use an accelerometer to measure cadence.


ROTOR power meters come with a full two-year manufacturer’s warranty.

Please see our ROTOR FAQ for more information on ROTOR power meters and accessories.

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