4iiii Precision 3+ Powermeter Crank Arm - Ride Ready | Single Side (left) - Shimano GRX RX810

How do you define success?

Whether it's fighting for a starting place at the Ironman in Kona, striving for a personal best or simply spending countless hours on the exercise bike, one thing is certain: success takes time. With a battery life of up to 800 hours and an accuracy of +/-1%, the Precision 3+ power meter is a high-quality and reliable training device for many years to come.

The robust yet lightweight design has been inherited from its predecessor. During the ride, the Precision 3+ transmits watts, cadence and calories to the main device as usual.

What's new?

The + refers to the Apple Find My technology integrated into the power meter. If the power meter is not in use, the Find My function is activated. If the power meter is added to the Find My app, it can be localized via an iPhone, iPad, Mac or with Find Items App on an Apple Watch.

Ride Ready. The 4iiii power meter sensor is delivered pre-assembled on the selected Shimano crank arm for Hollowtech II bottom brackets. After mounting it on the bike* and connecting it to the control unit or computer, you can start recording power immediately.

Technical details of the 4iiii Precision 3+ power meter sensor

• Power measurement: patented 3D measurement method from 4iiii
• Accuracy: +/- 1 %
• Power measurement range: 0 - 4000 W
• Cadence range: 30 - 170 rpm
• Battery life: up to 800 h (manufacturer's specification)
• Battery type: CR2032 (button cell)
• Wifi communication: ANT+ / Bluetooth
• Status display: LED indicator
• App compatibility: Apple Find My, Zwift, TrainerRoad, SYSTM etc.
• Temperature range: 0 - 50 °C (operation) / -40 - 60 °C (storage)
• Protection class (water resistance): IPX7 certified
• Height: 5.5 mm
• Weight: approx. 9 g (power meter without crank arm; manufacturer's specification)

Advantages of 4iiii power meter systems

3D power measurement | When force is exerted on the pedals and correspondingly on the crank, the crank arms are not only bent in one dimension - twisting and deformation processes take place in all 3 directions. The patented 3D force measurement system from 4iiii measures this multi-dimensional load so that the performance data is always determined precisely, regardless of the riding conditions and the unique pedal stroke of each rider.

Gold standard in precision | The accuracy of 4iiii power meters has been tested and confirmed by leading scientists at the Locomotion Lab at the University of Colorado. With an accuracy of +/- 1%, training, pacing and racing can be planned with the confidence of consistent data.

Dual-Channel ANT+ & Bluetooth Smart | To enable riders to read and record their performance data from a wide range of devices, sports watches, smartphones and computers, 4iiii power meters are able to transmit their measurement results using both the widely used ANT+ technology and the Bluetooth Smart wireless standard. Accordingly, 4iiii power meters are also compatible with all popular apps for indoor training, such as Zwift, TrainerRoad, TheSufferFest, Rouvy, etc.

Warranty & Durability | 4iiii's power measurement technology has proven itself in the toughest trials around the globe - be it in mud-soaked cross country mountain bike races, on the rainy gravel roads of the Strade Bianche or even in the salty ocean spray of the America's Cup. All 4iiii power meters are certified to IPX7 protection class and are therefore suitable for immersion in water up to one meter. As 4iiii is confident in the durability of its products, the manufacturer offers a 3-year guarantee.

Scope of delivery:

1 crank arm (left, brand new) with pre-mounted power meter sensor (Ride Ready)

* Important: When fitting, check that the measuring unit has sufficient space between the crank and frame. The manufacturer provides a template ("Frame Clearance Guide") for printing out on its website.