4iiii Ultegra R8000 Crank Arm w/PRECISION Power Meter Black Left Sided

3.4 out of 5 Customer Rating

The Details

Durable, lightweight and incredibly precise, the 4iiii Ultegra R8000 Crank Arm with PRECISION Power Meter Black Left Sided measures tri-axial strain to get a 3D view of where the power is going

Whether you’re a pro or simply training hard, PRECISION powermeters deliver industry-leading accuracy, highly dependable cadence data, 3D powermeter technology capable of measuring tri-axial strain on your crank arm. Designed to be durable and lightweight, compatible with ANT+ and Bluetooth head units, PRECISION helps you train harder and smarter.

PRECISION Ride Ready comes installed on a new Shimano left crank arm (105, Ultegra, or Dura-Ace). These crank arms will fit bottom brackets using the Hollowtech ii interface.

NOTE: check your frame clearance before ordering by downloading and printing the compatibility guide:https://4iiii.com/wp-content/uploads/2017/02/Ride-Ready-Clearance-Check-Letter-20170215.pdf

Features

  • 3D powermeter technology (patent pending) measures tri-axial strain on your crank arm

  • Accurate, consistent data

  • Lightweight, compact design

Display Compatibility:

4iiii PRECISION power meters use both the ANT+ PWR and Bluetooth Smart Cycling Power Service standards, which makes them compatible with nearly every headunit, smartphone, or computer you wish to connect to. Check your recording device documentation for ANT+ PWR or Bluetooth Smart (also called BLE, BTLE, or BT4.0) Cycling Power Service capability.Stealth 50

Our Verdict

Durable, lightweight and incredibly precise, the 4iiii Ultegra R8000 Crank Arm with PRECISION Power Meter Black Left Sided measures tri-axial strain to get a 3D view of where the power is going

Industry Reviews

At just 9g the 4iiii Precision power meter is the lightest on the market
Solid power meter that delivers highly usable data,

Key Specifications

  • Battery status indicator via 4iiii app
  • Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products
  • User-friendly app and configurable rider compensation scale factor
  • Easy setup and maintenance
  • Specifications
  • Weight: 9 grams
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ riding hours on 2032 coin cell battery
  • Module Weight: 9g (0.3oz)
  • Power Range: 0-4000W
  • Cadence Range: 30-150RPM
  • Communication Protocols: ANT+, Bluetooth
  • Operating Temperature: 0 to 50°C (32-122°F)
  • Storage Temperature: -20 to 50°C (4-122°F)
  • Battery Type: CR2032 lithium ion coin cell
  • Battery Life: 100+ hours
  • Waterproof Rating: IPX7, IPX5
  • Length: 37.7mm (1.5in)
  • Width: 27.6mm (1.1in)
  • Depth: 7.5mm (0.3in)

Delivery

Parts, accessories and clothing delivery - FREE over £30

Delivery for parts, accessories and clothing is free over £30 and £2.99 below that. We have a selection of premium delivery services available, including next day, AM, Saturday, timed delivery and local pickup services. Mainland UK only, some remote and off-shore areas or areas of Scotland may incur a surcharge. Delivery options and lead time estimates will be provided in checkout.

Click & Collect

Our Click & Collect service offers all the benefits of shopping online, combined with an award-winning retail experience in one of our stores. Simply order your items, select Click & Collect and pick up your item at a time that's convenient for you - our stores are open 7 days a week. Best of all, the service is completely free.

Reviews

Your Questions Answered

Durable, lightweight and incredibly precise, the 4iiii Ultegra R8000 Crank Arm with PRECISION Power Meter Black Left Sided measures tri-axial strain to get a 3D view of where the power is going

Whether you’re a pro or simply training hard, PRECISION powermeters deliver industry-leading accuracy, highly dependable cadence data, 3D powermeter technology capable of measuring tri-axial strain on your crank arm. Designed to be durable and lightweight, compatible with ANT+ and Bluetooth head units, PRECISION helps you train harder and smarter.

PRECISION Ride Ready comes installed on a new Shimano left crank arm (105, Ultegra, or Dura-Ace). These crank arms will fit bottom brackets using the Hollowtech ii interface.

NOTE: check your frame clearance before ordering by downloading and printing the compatibility guide:https://4iiii.com/wp-content/uploads/2017/02/Ride-Ready-Clearance-Check-Letter-20170215.pdf

Features

  • 3D powermeter technology (patent pending) measures tri-axial strain on your crank arm

  • Accurate, consistent data

  • Lightweight, compact design

Display Compatibility:

4iiii PRECISION power meters use both the ANT+ PWR and Bluetooth Smart Cycling Power Service standards, which makes them compatible with nearly every headunit, smartphone, or computer you wish to connect to. Check your recording device documentation for ANT+ PWR or Bluetooth Smart (also called BLE, BTLE, or BT4.0) Cycling Power Service capability.Stealth 50

  • Battery status indicator via 4iiii app
  • Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products
  • User-friendly app and configurable rider compensation scale factor
  • Easy setup and maintenance
  • Specifications
  • Weight: 9 grams
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ riding hours on 2032 coin cell battery
  • Module Weight: 9g (0.3oz)
  • Power Range: 0-4000W
  • Cadence Range: 30-150RPM
  • Communication Protocols: ANT+, Bluetooth
  • Operating Temperature: 0 to 50°C (32-122°F)
  • Storage Temperature: -20 to 50°C (4-122°F)
  • Battery Type: CR2032 lithium ion coin cell
  • Battery Life: 100+ hours
  • Waterproof Rating: IPX7, IPX5
  • Length: 37.7mm (1.5in)
  • Width: 27.6mm (1.1in)
  • Depth: 7.5mm (0.3in)

Durable, lightweight and incredibly precise, the 4iiii Ultegra R8000 Crank Arm with PRECISION Power Meter Black Left Sided measures tri-axial strain to get a 3D view of where the power is going

At just 9g the 4iiii Precision power meter is the lightest on the market
Solid power meter that delivers highly usable data,

Parts, accessories and clothing delivery - FREE over £30

Delivery for parts, accessories and clothing is free over £30 and £2.99 below that. We have a selection of premium delivery services available, including next day, AM, Saturday, timed delivery and local pickup services. Mainland UK only, some remote and off-shore areas or areas of Scotland may incur a surcharge. Delivery options and lead time estimates will be provided in checkout.

Click & Collect

Our Click & Collect service offers all the benefits of shopping online, combined with an award-winning retail experience in one of our stores. Simply order your items, select Click & Collect and pick up your item at a time that's convenient for you - our stores are open 7 days a week. Best of all, the service is completely free.

Finance your purchase with us today and spread the cost.

Purchase Price £268.99
Need some help? Speak to our sales team

All of our finance options are available online with no deposit, however if you would like to pay a deposit then you can speak to our helpful sales team who will arrange this and process your application for you.


🔒NEW Security checks

In conjunction with Novuna, we have recently implemented additional security checks as part of our online finance process. These additional checks may require you to submit photo ID when placing a finance order, so remember to watch out for emails from Novuna which may request this additional information.

Available Finance Options
Duration (months) Interest Rate (p.a. fixed) Monthly Payments Amount of Credit Total Repayable Deferral period
12 months 15.9 % APR £24.26 £268.99 £291.12 0.0
24 months 15.9 % APR £13.03 £268.99 £312.72 0.0
36 months 15.9 % APR £9.31 £268.99 £335.16 0.0
48 months 15.9 % APR £7.47 £268.99 £358.56 0.0
36 months 16.9 % APR £10.06 £268.99 £362.16 6

Rutland Water Cycling LTD (Reference number: 800269) trading as Rutland Cycling are an appointed representative of Specialized (UK) Retail Limited (Reference number: 976130) which is authorised and regulated by the Financial Conduct Authority for credit broking. Credit is subject to status and affordability, and is provided by Mitsubishi HC Capital UK PLC. Terms & Conditions Apply.