Our 2026 powermeters

VELO-PERSO · CYCLING POWER METERS

Track your watts. Keep what already works.

Already running a Shimano crankset? An INPEAK left crank arm may be all you need. Looking for less weight, different gearing or truly independent left/right measurements? Explore the Rotor cranksets.

  • 4 INPEAK options for Shimano
  • Rotor INpower · INspider 2.0 · 2INpower SL
  • Cycling expertise since 2009

Three measurement locations: left crank arm, spider and true dual-sided crankset.

AT A GLANCE

Three technologies. Three distinct uses.

The key difference is not just price: it is where the power is measured and how much of your current setup you keep.

01

Left-side measurement

Left × 2 = estimated total power

A straightforward approach for training with your existing Shimano crankset, or a complete Rotor INpower setup.

Browse single-sided options →
02

Total power at the spider

Combined total, no independent leg data

Rotor INspider 2.0 measures total power transferred through the spider, with modular aluminium or carbon cranksets.

Explore INspider →
03

Independent left/right power

Each leg measured separately

Rotor 2INpower SL genuinely separates both legs’ contributions for advanced pedalling analysis.

Explore 2INpower SL →
Key distinction: “total power” does not mean “independent left/right measurement”. A left-side sensor extrapolates, a spider combines power, and 2INpower SL measures the legs separately.

KEEP YOUR SHIMANO CRANKSET

INPEAK POWERCRANK-E: four ways to add power.

The direct solution when you already like your crankset: a genuine Shimano left crank arm with a rechargeable power meter, leaving the rest of the crankset in place. Single-sided power, ANT+ / Bluetooth, up to 90 hours of claimed runtime.

INPEAK POWERCRANK-E Shimano 105 FC-R7100 - left crank arm power meter
Smart entry point

INPEAK 105 R7100

For an existing Shimano 105 12s road crankset.

View the 105 →
INPEAK POWERCRANK-E Shimano Ultegra FC-R8100 - left crank arm power meter
Versatile road choice

INPEAK Ultegra R8100

Add power without replacing your excellent Ultegra crankset.

View the Ultegra →
INPEAK POWERCRANK-E Shimano Dura-Ace FC-R9200 - left crank arm power meter
Premium integration

INPEAK Dura-Ace R9200

Keep your Dura-Ace build with discreet measurement.

View the Dura-Ace →
INPEAK POWERCRANK-E Shimano GRX RX810 RX820 - left crank arm power meter
Gravel power

INPEAK GRX RX810 / RX820

For compatible Shimano GRX 11s and 12s cranksets.

View the GRX →
Before ordering, check the exact crankset reference, crank length and clearance between the sensor module and the left chainstay. Product pages show the available variants.

UPGRADE THE CRANKSET, NOT JUST THE SENSOR

Rotor: choose your weight, gearing and measurement.

A complete crankset makes sense if you also want a different crank length, spindle, chainrings or measurement architecture. Here are three useful starting points, with detailed specifications on their dedicated product and category pages.

Want a lighter carbon build? Explore the Rotor Aldhu Carbon INspider 2.0: total power integrated into a premium crankset.

GET THE RIGHT PART FIRST TIME

Choose the technology, then confirm compatibility.

Your current crankset

INPEAK replaces a compatible left crank arm. A complete Rotor crankset may also require a different spindle and bottom bracket.

The data you need

For FTP and training zones, repeatable left-side power may be sufficient. To measure each leg separately, choose 2INpower SL.

Frame & gearing

Check crank length, left-chainstay clearance, bottom bracket standard and drivetrain compatibility.

Quick questions before ordering

INPEAK or INspider if I already own a Shimano 105, Ultegra or Dura-Ace crankset?

INPEAK is usually the more rational choice when you simply want power readings on a compatible crankset. INspider requires a compatible Rotor setup and makes more sense if you also want to change the crankset.

Does INspider measure left and right legs independently?

No. The spider measures total transmitted power; it does not independently measure each leg. For independent left/right readings, choose a true dual-sided system such as Rotor 2INpower SL.

Will these meters work with Garmin and Wahoo computers?

The INPEAK and Rotor products shown use ANT+ and/or Bluetooth, depending on the model. Check the protocol supported by your specific head unit and the product specifications before ordering.

Velo-Perso has specialised in cycling components since 2009. Check the relevant product page for crank length, compatibility, current price and availability.

Subcategories

  • INspider

    Aldhu Carbon Inspider 12s Shimano

    Inspider – The Versatile Power Meter Spider for Cyclists

    Inspider is a power meter spider that fits directly onto your Rotor crankset, easily replacing a 4-arm spider you may already own. Designed to adapt to different disciplines, the Inspider comes in two versions:

    • Inspider Road: BCD 110 mm, ideal for road cycling.
    • Inspider MTB: BCD 100 mm single chainring, perfect for mountain biking enthusiasts.

    Inspider Compatibility and Installation

    Easy installation on Rotor axles, suitable for both road and MTB use.

    For optimal performance, it is crucial to match the spider with the correct axle:

    • Inspider Road with a road axle.
    • Inspider MTB with an MTB axle.

    This ensures the best power transfer and the right stiffness for each discipline.

    Complete Configurable Cranksets to Simplify Your Choice

    To make your selection easier, we offer complete Inspider cranksets built around various Rotor crank arms:

    Road:

    • Vegast: Forged aluminum crank arms, robust and affordable.
    • Aldhu: CNC-machined aluminum, lighter and more precise.
    • Aldhu Carbon: Carbon crank arms for maximum weight reduction.

    MTB:

    • Kapic: Designed for rough terrains, with aluminum construction for maximum durability.
    • Kapic Carbon: Lightweight carbon version, perfect for competitive riders looking to save weight.

    Customize Your Inspider Crankset

    • Crank arm length: Choose from multiple options for a perfect fit.
    • Chainring type: Opt for round or oval chainrings depending on your pedaling preferences.
    • Axle type: Available in 24 mm and 30 mm for Vegast and Aldhu models.
    • Various tooth options: Customize the tooth count based on your riding style, whether you're seeking speed on the road or traction on climbs.

    Why Choose the Inspider?

    • Proven accuracy: Inspider delivers recognized power measurement precision, equivalent to the 2INpower and other leading power meters.
    • Combined measurement: Total power is measured at the spider level, making it ideal for an overall view of your effort.
    • Versatility: Suitable for both road and MTB, with extensive compatibility for different crankset configurations.

    Cyclists Love the Inspider for:

    • Its adaptability: Compatible with numerous crankset setups, from road to MTB.
    • Its durability: Built to withstand demanding conditions, whether on long road rides or technical trails.
    • Its advanced connectivity: Compatible with Bluetooth and ANT+ for real-time performance tracking.

    Inspider: A Reference for All Cyclists

    Whether you're looking to improve your race performance, optimize your pedaling technique, or precisely track your training sessions, the Inspider is the ideal choice for demanding cyclists. Order your Inspider power meter now and enjoy fast shipping and personalized technical support to help you choose the perfect setup.

    https://www.youtube.com/watch?v=3Y9EY2hBj5k

  • INpower
    Inpower V3 left side with 30mm axle

    Inpower: Affordable and High-Performance Power Meter Crankset for Cyclists

    Discover the Inpower range, the ideal power meter crankset for cyclists looking to track their progress at an affordable price. Available in a sleek gloss finish (Inpower V3) and offered in several versions, Inpower includes aero options (54/42, 55/42, 56/44, and 58/44), classic versions (50/34, 52/36, 53/39), as well as micro compact options (46/30 and 48/32) for maximum versatility.

    30 mm Spindle and Universal Compatibility

    At the heart of Inpower is its 30 mm spindle, ensuring optimal stiffness for efficient power transfer. With Rotor bottom brackets sold separately, it is compatible with all frame types, including BB30, PF30, BSA, and T47 systems. Its direct mount system makes installation and chainring changes quick and easy, simplifying your road bike setup.

    A Precise and Economical 2-in-1 Power Meter

    Inpower integrates a power meter directly into the spindle, providing precise left-leg power measurement. Powered by a single AA battery with a 300-hour battery life, it ensures long training sessions without interruption. Available in crank lengths of 165 mm, 170 mm, 172.5 mm, and 175 mm, Inpower adapts to every rider for optimal performance.

    Advanced Connectivity and Analysis with the Rotor App

    Compatible with the Rotor app, Inpower easily connects to a GPS or smartphone via ANT+™ and Bluetooth® Smart. This allows you to track your power and cadence data in real time and analyze your performance curves. It’s the perfect crankset for road cyclists and time trialists (TT) looking to explore power measurement without breaking the bank.

    Inpower: The Ideal Entry Point for Power Measurement in Cycling

    With a starting price below 500€ (without chainrings), Inpower offers a complete and accessible solution for improving your performance. If Inpower were to be compared to a reference model, it would be positioned within the Vegast range, known for its excellent value for money. Enjoy a robust and lightweight crankset, crafted from high-quality aluminum, to achieve your cycling goals.

  • 2INpower

    2INpower SL: box content

    2INpower SL – Precision for Demanding Cyclists

    Discover the 2INpower SL, the ideal choice for athletes seeking maximum precision in power measurement. This latest generation power meter, with its dual-sided power measurement, gives you detailed insights into each pedal stroke, helping you optimize your performance.

    Technical Features of the 2INpower SL:

    Dual power measurement: Separate analysis of power from each leg through 4 strain gauge pairs, offering exceptional data accuracy.

    Crank arms: Made of CNC-machined aluminum, offering optimal balance between weight and rigidity.

    30 mm Axle: Compatible with Rotor bottom brackets in steel and ceramic, ensuring direct and reliable power transmission.

    Internal rechargeable battery: Long-lasting and easy to recharge, for continuous tracking of your training.

    Compatibility and Available Versions:

    Different versions to suit your practice:

    • Classic 12v: Ideal for versatile use.
    • Aero 12v: Designed for speed enthusiasts and competitors, with an optimized aerodynamic design.
    • Semi Aero 12v: A perfect compromise between performance and versatility.
    • Spidering Version: Simplify your drivetrain with a direct mount setup.

    Chainring Options:

    • Double chainrings: 46/36, 50/34, 52/36, 53/39, 54/39, 54/42, 55/42, 56/44, 58/44.
    • Micro compact: Adapt your 2INpower for challenging climbs with options like 46/30 and 48/32.
    • Rotor single chainrings: Perfect for triathlons and time trials.

    Why Choose the 2INpower SL?

    • Detailed analysis of each leg: Optimize your power balance and improve your technique.
    • Lightweight and Performance: The SL version is lighter than the classic model, giving you a competitive edge.
    • Reliability and Durability: With internal strain gauges and a 30 mm axle, the 2INpower SL is built to last.

    2INpower Classic – A Final Series Option

    The 2INpower Classic is still available in the 175 mm version, making it an affordable option for those seeking a reliable power meter without the lightweight benefits of the SL model.

    This version is perfect for cyclists looking for a proven solution that offers dependable performance.

    Note: The 2INpower Classic is a final series product, only available in 175 mm crank length.

    Accessories Available:

    Find all the accessories for 2INpower and 2INpower SL, including compatible bottom brackets, installation tools, and chainring options to configure your crankset to your specific needs.

Active filters

-€80.00
New
Our 2026 powermeters

INPEAK POWERCRANK-E Shimano 105 FC-R7100 rechargeable left-side power meter

€349.00 €269.00
-€80.00
New
Our 2026 powermeters

INPEAK POWERCRANK-E Shimano Ultegra FC-R8100 rechargeable left-side power meter

€409.00 €329.00
-€90.00
New
Our 2026 powermeters

INPEAK POWERCRANK Shimano Ultegra FC-R8100 CR2032 Battery Power Meter

€389.00 €299.00
-€40.00
Our 2026 powermeters

Rotor INspider MTB 100*4 + chainring

€349.00 €309.00
-€28.00
New
Our 2026 powermeters

ROTOR ALDHU XCADEY Track Power Meter Crankset 144 BCD + BSA30 Track

€727.00 €699.00
-€50.00
New
Our 2026 powermeters

INPEAK POWERCRANK E TWiN2 Shimano 105 R7100 dual sided rechargeable power meter crankset

€649.00 €599.00
-€50.00
New
Our 2026 powermeters

INPEAK TWiN2 Shimano GRX RX820 12s Power Meter Crankset 48/31

€899.00 €849.00
-€100.00
New
Out-of-Stock
Our 2026 powermeters

INPEAK POWERCRANK E TWiN2 Shimano Dura Ace FC R9200 dual-sided power meter crankset

€1,099.00 €999.00
-€60.00
New
Our 2026 powermeters

INPEAK POWERCRANK E TWiN2 Shimano Ultegra R8100 dual sided rechargeable power meter crankset

€899.00 €839.00
-€20.00
INspider

Rotor Inspider 2.0, the modular powermeter for Vegast, Aldhu & Aldhu Carbon

€349.90 €329.90