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ROTOR INspider MTB KAPIC Aluminum Power Meter

Josh Matthew June 6, 2024


The ROTOR INspider MTB + KAPIC aluminum crankset!

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ROTOR INspider MTB KAPIC Aluminum Power Meter

The ROTOR INspider MTB KAPIC Aluminum Power Meter features the new INspider MTB on a KAPIC 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 crankset is ROTOR’s go-to all terrain MTB crankset. It weighs just 545 grams (170 mm with 32T rings) and is also exceptionally stiff. It fits Standard (142 mm) and Boost (148 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, 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 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. The KAPIC aluminum crank arms are not quite as light and stiff as the carbon version, but it’s still a very nice crankset and we think $899 for the power meter, cranks and chainring is a fair price!


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 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 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 Standard and Boost frames based on the version ordered.

ROTOR INspider MTB KAPIC Aluminum Crankset Specs

NameROTOR INspider KAPIC Aluminum 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
Weight665 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 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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