Power meter
4iiii Precision 3+
A single-sided strain-gauge pod bonded to the left crank arm, sold ready-fitted to Shimano arms or installed on a rider's own crank. It is a light, affordable way to add power to a stock Shimano build, and the 2024 update brought a slimmer pod, much longer coin-cell life and Apple Find My support. Being left-only, it doubles the left leg's output to estimate total power.
Fitted to 20 builds across 16 bikes in the database.
Specs
- Type
- Crank arm (left)
- Measurement
- Left only (non-drive side)
- Claimed accuracy
- ±1%
- Battery
- CR2032 coin cell
- Battery life
- Up to 800 hours
- Connectivity
- ANT+, Bluetooth Smart
- Weight
- 9 g0.3 oz
- Notes
- Weight is the 4iiii unit only, not the crank arm. IPX7 water resistance.
- Released
- 2024
Bikes that come with it
| Bike | Build | Price (MSRP) | Type | Measurement | Notes |
|---|---|---|---|---|---|
| BMC Speedmachine 012027 | Speedmachine 01 TWO | €9,999$9,499£8,999 | — | Left only (non-drive side) | — |
| BMC Teammachine R 012027 | Teammachine R 01 FOUR | €7,999$8,999£7,299 | — | Left only (non-drive side) | — |
| Canyon Aeroad CF SLX2027 | Aeroad CF SLX 7 Di2 | €4,799$4,999£4,499 | Crank-arm | — | Canyon's component table doesn't state whether it measures one or both sides |
| Canyon Speedmax CF SLX2027 | Speedmax CF SLX 8 Di2 | €7,999$8,499£7,599 | — | — | — |
| Canyon Speedmax CF SLX2027 | Speedmax CF SLX 7 Di2 | €6,499$6,999£6,149 | — | — | — |
| Canyon Speedmax CF SLX2027 | Speedmax CF SLX 7 Di2 | €6,499$6,999£6,149 | — | — | — |
| Cervélo P-Series2027 | P-Series 105 Di2 | €6,499$6,700£5,500 | — | Single-sided | — |
| Cervélo P-Series2027 | P-Series 105 | €5,299$5,300£4,500 | — | Single-sided | — |
| Bianchi Aquila RC2026 | Aquila RC Dura-Ace Di2 4iiii Power Meter | €13,390€13,390€13,390 | — | Dual-sided | — |
| Bianchi Oltre Pro2026 | Oltre Pro Ultegra Di2 (4iiii power meter) | €8,000€8,000€8,000 | — | Left only | Bianchi lists a 4iiii Precision 3 single-side power meter |
| Bianchi Oltre RC2026 | Oltre RC Shimano Dura-Ace Di2 (4iiii power meter) | €12,600€12,600£10,850 | Crank arm | Dual-sided | — |
| Cinelli Aeroscoop2026 | Aeroscoop Shimano Ultegra Di2 | €6,900€6,900€6,900 | — | — | — |
| Cube Aerium C:68X2026 | Aerium C:68X SLT | €8,999€8,999€8,999 | Dual-sided | — | — |
| Cube Aerium C:68X2026 | Aerium C:68X Race | €6,299€6,299€6,299 | — | Dual-sided | — |
| Dare Velocity Ace (VA-AFO)2026 | VA-AFO S8 | €5,699$6,699€5,699 | — | — | — |
| Quintana Roo Studio NEXT Service Course2026 | Studio NEXT Service Course Shimano Ultegra Di2 | — | Crank arm | Left only | — |
| Quintana Roo Service Course2026 | Service Course Shimano Dura-Ace Di2 | — | Crank arm | Left only | — |
| Quintana Roo Studio NEXT V-PRi2026 | Studio NEXT V-PRi Shimano Ultegra Di2 | — | Crank arm | Left only | — |
| Cinelli Pressure II2025 | Pressure 2 Ultegra Disc Di2 | €6,400€6,400€6,400 | — | — | — |
| Quintana Roo V-PRi2024 | V-PRi Shimano Ultegra Di2 | — | Crank arm | Left only | — |