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ROTOR INspider KAPIC Carbon MTB Power Meter

Josh Matthew March 10, 2023


A ROTOR spider-based MTB crankset on a full carbon KAPIC crankset!

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ROTOR INspider KAPIC Carbon MTB Power Meter

The ROTOR INspider KAPIC Carbon MTB Power Meter is the first of its kind – a spider-based power meter that can be used on virtually any bike! Compatible with any of ROTOR’s newer direct mount MTB cranksets, 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, lightweight carbon cranks, fits boost and super 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. The KAPIC carbon crank arms are super lightweight and stiff. 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: Boost | Super Boost


Other Versions to Consider

INspider KAPIC Aluminum: We also sell the ROTOR INspider KAPIC Aluminum MTB Power Meter. It is slightly more affordable, however uses aluminum 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 Boost and Super Boost frames based on the version ordered.

ROTOR INspider KAPIC Carbon Crankset Specs

NameROTOR INspider KAPIC Carbon 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 SpacingBoost and Super Boost
Crank Arm MaterialCarbon
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Active Temperature CompensationNo
Weight578 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 Carbon 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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