Rotor INPower 3D+ double

Rotor INPower 3D+ Power Meter (double)
  • Editor Rating
  • Rated 4.5 stars
£700 to £750
  • 80%

  • Ease of Installation
    Editor: 70%
  • Value for Money
    Editor: 99%
  • Sides? 50% = Single / 100% = Dual
    Editor: 50%
  • Bluetooth Connectivity (100% = Yes)
    Editor: 0%
  • ANT+ Connectivity (100% = Yes)
    Editor: 100%
  • Battery Life (scale from 50 - 200 hrs)
    Editor: 100%
  • Ease of Battery Change
    Editor: 100%
  • Power Phase Analysis (Torque 360)
    Editor: 100%


The Rotor INPower 3D+ power meter hub has been reviewed by Tristan Haskins for A sophisticated power metering system with all the sensitive electronics housed inside the axle unit. The Rotor INPower 3D extracts power from the left leg only to give an estimated TOTAL power. Fans of this power meter are attracted to it’s robust design and the 300 hour battery life from a single AA battery. This double model comes as a full crankset kit … If you already have a Rotor 30mm crank set you can use the SINGLE sided Rotor INPower 3D here.

Product Summary

Rotor are the brand behind Q-Rings. An innovative chainring design that provides a more continuous power curve. Producing a product that generates a more efficient pedaling action lead Rotor in to the design and manufacture of Power Meters. This is their double crankset power meter, the INpower 3D+. The highest quality aluminum CNC milles cranks with a total crankset weight of just 525 grams. Power is measured by 4 x strain gauges discretely hidden away in the BB axle. The INPower 3D double comes with a standard 5 bolt design crank spider available in both 110 and 130mm chainring bolt diameters (BCD)

INPower 3D30 versus 3D+? Rotor also produce an INPower 3D30 power meter product. The key difference between the 3D30 and this one is the 3D+ is 100% manufactured by an aluminum / CNC milling process making it 40g lighter than the 3D30 double crankset alternative.


  • All electronics housed inside spindle, safe from the elements
  • Up to 300 hours battery life from a regular AA battery
  • Accurate power metering with Rotor Q-Rings
  • 10 second battery change, no tools required
  • Provides 360 Power Phase Analysis via software
  • Broadcasts in both ANT+ and Bluetooth 4.0 (BTLE smart)
  • 100% CNC-machined, 7055 aluminum alloy
  • Cons

  • May require local bike shop fitting ... but well worth £50/$60 fitting charge
  • Who are they for?

    If you already train with Q-Rings then it makes sense to use a power metering system developed by the company who made your chainring. This product is perfect for the customer looking for a new PAIR of cranks with built-in power metering.

    All the INPower products have been optimized for Q-Rings with the unique TORQUE 360 and OCA (Optimum Chainring Angle) features. Torque 360 and OCA help cyclists precisely and accurately analyze force variations in their pedal stroke (if supported by head unit). If you’re interested in the shape of your power curve and want to know if you’re achieving the perfect power peanut this could be the power meter for you.

    More Rotor Products

    Rotor have designed their power meters for all cycling styles and disciplines. As such they have the INPower REX dedicated for MTB as well as their aerodynamic FLOW MAS (micro adjust spider) system for road racing and triathlon. Wiggle currently have the largest range of Rotor INPower power meters online.

    Method of Installation

    If you’re thinking of buying the INPower 3D (double) crank set then you are probably updating the crankset from Shimano, FSA, Campagnolo or other to a Rotor Q-Rings system. The first thing you need to do is remove the existing drivetrain configuration leaving just the Bottom Bracket. The Rotor INPower 3D uses Rotors 30mm UBB – Universal Bottom Bracket spindle – compatible with every frame standard on the market.

    In all honesty, as with all power meters with exception of pedals and crank arms, installing the INPower 3D is beyond my comfort zone / skill set. I’d look to my local bike shop for installation.

    Tools Required to fit this Power Meter

    Removal of existing crankset – It depends on what your are removing … Shimano? FSA? Campagnolo? etc

    Once you have a naked bottom bracket the only tools you should need are :

    • 8mm allen key
    • A torque wrench with an 8mm fitting,
    • A Shimano cassette locking removal tool
    • Plastic mallet

    Alternative Power Meters

    These Rotor INPower power meters are quite unique measuring the power from the axle and NOT within the crank arm shaft. There are no direct alternatives that work in the same way as these axle power meters. If you have already use Rotor Q-Rings and want to add power metering then stick with this INPower system. If you are replacing a non-Rotor crankset, eg. Shimano, ensure you purchase the correct 110 or 130 BCD system to match your existing chainring setup.

    For those seeking a simple left side power measurement system wanting to keep their existing crankset, chainset etc. the simplest solution are the crank arm power meters from 4iiii, Precision and Pioneer.

    4iiii Precision Crank

    Stages Power Crank

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    Rotor InPower Meters at Wiggle price checkCheck the price of this pwer meter at Merlin Cycles

    Technical Specification

    • Power metrics are easily sent to your ANT+ device (head unit) so you can see your results
    • Integrated electronics (and battery) housed within the axle making for cleaner data transfer
    • INpower uses a standard AA battery that typically lasts 300 hours when fully charged
    • INpower cranks use UBB (universal bottom bracket) and are compatible with almost every bike frame on the market
    • INpower software features different modules to optimise your cycling performance
    • INpower is compatible with all Rotor 30mm cranks
    • Weight (110 BCD): 525g
    • Strain gauges: 4
    • Axle: 30mm (UBB – Universal Bottom Bracket)
    • Axle material: Aluminium
    • Battery: AA 1.5V (300 hours riding time)
    • Water resistance: IPX7
    • Wireless technology: ANT+ 2.4Ghz
    • Crankarm lengths available: 170mm, 172,5mm, 175mm
    • Metrics and Software
    • Data transmitted: Power, Cadence, TORQUE 360, OCA, torque effectiveness (left) and pedal smoothness (left)
    • Analysis software: Trainingpeaks/ROTOR
    • Software: ROTOR INpower user software

    Photo Gallery

    INpower 3D double uses Rotor's UBB Universal Bottom Bracket spindle

    Closeup detail of the Rotor INPower 3D+ battery slot and AA battery (300 hours life)

    Detailed breakdown of main features of Rotor INPower power meters

    External Videos

    1) Installing the Rotor Cranks

    A short video presentation from Rotor showing how to install and uninstall their INpower 3D power meter crankset.

    2) INPower Software for 360 degree power analysis

    INpower features TORQUE 360 and Optimum Chainring Angle (OCA) pedal analysis, which help cyclists precisely and accurately assess force variations in their pedal stroke. TORQUE 360 and OCA values enable cyclists to orient their Q-Rings around their distinct pedaling characteristics in order to take advantage of their most productive zone. This short video shows the INPower software analysing the power phase of a rider.

    External Resources

    The purpose of product presentations is to give the visitor a summary overview of each power meter. They are NOT intended as an in-depth technical review, more a summary providing essential top level features, functions, pros and cons. Further information can be found at these links to other external reference sites.

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