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ROTOR INspider MTB KAPIC Carbon Power Meter

Josh Matthew April 12, 2024


The ROTOR INspider MTB + KAPIC carbon crankset!

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ROTOR INspider MTB KAPIC Carbon Power Meter

The ROTOR INspider MTB KAPIC Carbon Power Meter features the new INspider MTB on a KAPIC Carbon crankset. The INspider MTB is a spider-based power meter that offers dual-leg power measurement. It’s accurate to 1.5%, has a 350-hour rechargeable battery and is extremely lightweight at only 105 grams. It fits both round and oval 1x chainrings which are available in sizes as small as 30T.

In addition, the KAPIC Carbon crankset is ROTOR’s newest, lightest and stiffest MTB crankset ever. It is light enough to satisfy the demands of any racer while the full carbon layup ensures incredible strength and rigidity. The KAPIC Carbon cranks are compatible with Boost (148 mm) and Super Boost (157 mm) frames.


Key Product Details


This power meter fits 30 MM MTB bottom brackets and ROTOR 100 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 +/- 1.5%, 350 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 new MTB cranksets. The INspider MTB measures power from both legs, is accurate and reliable. It’s also lightweight and works with round and oval chainrings as small at 30T. In addition, the KAPIC carbon crank arms are super lightweight and stiff. It’s the complete package.


Options For This Power Meter

  • Crank Arm Length: 165 mm | 170 mm | 175 mm
  • Chainring Size: 30T | 32T | 34T | 36T
  • 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 100×4 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 changing 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 MTB KAPIC Carbon Crankset Specs

NameROTOR INspider KAPIC Carbon MTB
Bike TypeMTB
Location of Power MeasurementSpider
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes - Power Balance
InstallationMore involved (60 min. estimated)
Chainring Configuration1X
Speeds11- and 12-speed Shimano and SRAM
Chainline SpacingBoost and Super Boost
Crank Arm MaterialCarbon
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.5%
Active Temperature CompensationNo
Weight534 grams (175, 32T)
Battery TypeRechargeable
Battery Life350 hours
Method of Cadence MeasurementAccelerometer
BCD100 mm 4-bolt asymmetric
Spindle Size30 mm
Q FactorVaries based on crankset
Warranty2 years

In the Box

  • ROTOR INspider MTB 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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