Compact Ultegra 12-speed "Precision 3" power meter left crankset

Shimano Ultegra R8100 crankset with 4iiii Precision 3 power meter left

The Shimano Ultegra 12-speed 50/34 crankset with the 4iiii PRECISION 3 power meter is used during crucial moments such as the attacks towards Alpe D'Huez during the Tour de France and the Ironman World Championships on the Queen K. It delivers industry-leading accuracy and reliability when you need it most. Thanks to its patented 3D strain gauge technology, you can be sure that the data you rely on will lead you to victory, your own yellow jersey.

The PRECISION 3 is wrapped in a rugged, lightweight design, and is compatible with ANT+ and Bluetooth Smart control devices. A ready-to-run PRECISION 3 comes pre-installed on an all-new Shimano crankset, fitting Hollowtech II cranksets. It now offers longer battery life of up to 800 hours, and a lower build height of 5.5mm instead of 7.5mm on the previous model. In addition, a status LED has been integrated to allow you to quickly view the mode or status of the device.

Key features of the 4iiii Left-Side Precision 3 power meter:

• PRECISION 3 Powermeter pre-installed on a new Shimano crank arm
• Dimensions: 32mm x 23mm x 14mm
• Accuracy: +/- 1%
• 3D power measurement
• Status LEDs
• Battery life: approx. 800 hours with a CR2032 coin cell battery (depending on the manufacturer)
• Connection: ANT+ / Bluetooth
• Compatible with training apps such as Zwift, TrainerRoad, SYSTM, etc.
• Backwards compatible with Precision Drive Side Powermeter
• Power measurement range: 0 - 4000 watts
• Cadence range: 30 - 170 rpm
• Operating temperature: 0°C - 50°C
• Storage temperature: -40°C - 60°C
• Water resistance: IPx7
• Weight: 1200 g (measurement units only / manufacturer data)

Information about the 4iiii Left-Side Precision 3 crank arm with powermeter:

How it works ?

The PRECISION 3 powermeter comes pre-installed on an all-new Shimano crank arm, allowing you to measure power immediately after installation. Important note: It is essential to check that there is enough space between the crank and the frame for the measuring unit.

What do you receive?

When you receive your PRECISION 3 Powermeter ready to ride, simply mount it to your bike following the standard mounting procedure for Shimano cranksets. Connect a control unit or computer and you can start riding with power!

Guarantee and durability:

Whether in the downpours of the Strade Bianche, in the muddy mountain bike races of Cross