The ROTOR 2INpower MAS Crankset power Meter shares all of the same features as the standard, best-selling 2INpower. It measures independent left/right power, has Bluetooth SMART functionality, a built-in rechargeable battery and uses ROTOR’s Universal Bottom Bracket, making it compatible with almost every bike frame on the market.
However with the ROTOR 2INpower MAS power meter, ROTOR has replaced their standard 5-bolt spider with their proprietary Micro Adjust Spider (MAS). The MAS offers several advantages over the regular spider. First and foremost, ROTOR’s MAS allows you adjust your Q-Ring position with a higher level of precision. This allows you to dial-in your pedal stroke so you can best take advantage of your Q-Rings and ensure maximum pedal efficiency and power. In addition, the MAS offers increased stiffness which leads to better shifting as well as features improved aerodynamics. For most cyclists, these benefits more than overcome the additional 20-30 grams the MAS adds over the regular spider.
ROTOR 2INpower Options
The 2INpower MAS is available in the following crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm
2INpower is equipped with a 30 mm Universal Bottom Bracket (UBB) system. UBB30 is compatible with almost all standard frames in the market (when used with the correct spacers). ROTOR 2INpower can be installed on your bike even if your current cranks are 24 mm diameter.
Specifically, UBB30 is compatible with the following standards: BB30 (68/73 mm), PF30 (68/73 mm), BSA threaded, ITA threaded, BBright and BBright Direct Fit, BB86, BB386 EVO, BB89 and BB92.
The only frames not compatible with the UBB30 system are BB90 and BB95 (both for 24 mm diameter axle).
In the Box
ROTOR 2INpower MAS Crankset
USB cable for charging
2INpower MAS Crankset Power Meter
Power Meter Type
Axle / Bottom Bracket
Number of strain gauges
8 (4 in right crank arm, 4 in axle)
670 grams (172.5 mm)
Crank Arm Lengths
165, 170, 172.5, 175 mm
Left/Right Power Measurement
Bluetooth and ANT+
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