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ROTOR INspider KAPIC Aluminum MTB Power Meter

Josh Matthew March 8, 2023


The ROTOR INspider with Kapic Aluminum cranks for Standard and Boost frames

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ROTOR INspider KAPIC Aluminum MTB Power Meter

The ROTOR INspider KAPIC Aluminum MTB Power Meter is the first of its kind – a spider-based power meter that can be used on virtually any bike! The INspider records data via four sets of opposing gauges. This results in a high degree of accuracy (+/- 1.0%) and also means the power meter can measure left and right leg power balance. The INspider also features ANT+ and Bluetooth SMART and has a USB-rechargeable battery with 200-hour battery life.


Key Product Details


This power meter fits 30 MM MTB bottom brackets and 110 BCD 4-bolt chainrings. See Compatibility tab for more information.

Power Measurement:

The ROTOR INspider power meter measures power at the spider and is therefore able to measure power from both legs.

Key Features:

Dual-leg power measurement, accurate to +/- 1.0%, 200 hours of battery life, fits standard and boost frames, works great with oval chainrings, rechargeable battery, left/right power balance, ANT+ and Bluetooth compatibility. See Specs tab for more information.

Advice From Our Staff:

This is one of our favorite MTB cranksets. Here’s why: the ROTOR power meter measures power from both legs, is accurate and reliable. One consideration however is the smallest ring you can run on it is a 34T vs. the commonly used 32T.


Options For This Power Meter

  • Crank Arm Length: 165 mm | 170 mm | 175 mm
  • Chainring Size: 34T | 36T | 38T
  • Chainring Shape: Round | Oval
  • Spacing: Standard | Boost


Other Versions to Consider

INspider KAPIC Carbon: We also sell the ROTOR INspider KAPIC Carbon MTB Power Meter. It costs a bit more money, but features carbon fiber crank arms.


Chainrings: The power meter is compatible with ROTOR 110×4 Chainrings, which are available in round and oval and can be purchased on this page along with the power meter.

Bottom Bracket: This power meter fits 30 MM bottom brackets. If you currently have a 30 MM crankset on your bike, you should be able to re-use your existing bottom bracket. However, if you are chaining spindle sizes, you will need to replace your bottom bracket.

Frame Spacing: The power meter fits both Standard and Boost frames based on the version ordered.

ROTOR INspider KAPIC Aluminum Crankset Specs

NameROTOR INspider KAPIC MTB Power Meter
Bike TypeMTB
Location of Power MeasurementSpider
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes - Power Balance
InstallationMore involved (60 min. estimated)
Chainring Configuration1X
Speeds9-, 10-, 11-, 12- and 13-speed
Chainline SpacingStandard and Boost
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Active Temperature CompensationNo
Weight710 grams (175, 32T)
Battery TypeRechargeable
Battery Life200 hours
Method of Cadence MeasurementAccelerometer
BCD110 mm 4-bolt asymmetric
Spindle Size30 mm
Q FactorVaries based on crankset
Warranty2 years

In the Box

  • ROTOR INspider KAPIC Aluminum Crankset (spider, cranks, chainring)
  • USB cable for charging
  • User's manual

Tools Needed for Installation

You will need the following tools for installation of this product. You can purchase many of these commonly used tools in our store.

  • 10 mm Allen key

Common Questions and Answers

Question: How do I determine what length my current cranks are so I can make sure I get the same size?

  • Your crank arm length should be printed or stamped on the inside of the left crank arm, usually near the pedal end.

End of crank arm showing crank arm length


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