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The 4iiii Dura Ace R9200 Precision 3 power meter is a single-sided powermeter for cranks of the Shimano R9200 series. It measures the power at the left crank arm. The 4iiii power meter is now available in the 3rd generation. The actual powermeter weighs in at only 9g and sits well protected inside the left crank arm. The widely used CR2032 battery lasts for a whopping 800 hours of operation of the powermeter. The measurement accuracy is ± 1%. For mounting the 4iiii Power L Dura Ace R9200 you need the TL-FC16 tool.
Highlights and Downsides
- single-sided power measurement with high accuracy (± 1%)
- 800h battery life with a CR2032
- integrated cadence measurement
- very low weight (adds only 9g to the crank arm)
- automatic temperature compensation
- easy to swap between bikes
- compatible with all Shimano Hollowtech II road cranksets (105, Ultegra, Dura Ace)
- works with many bike computers and smartphones (ANT+ & Bluetooth)
- 3-year manufacturer's warranty
- only left-sided measurement
- compatible only with Shimano Hollowtech II road cranksets
- TL-FC16 tool needed for installation
With the 4iiii Precision 3 power meter, only the left crank arm is equipped with measurement electronics. The power is doubled to estimate the total power. Staying in your training zones or pacing a long climb or a triathlon usually works very well with a single-sided power meter. It becomes more difficult when one leg is significantly stronger than the other. Then the total power deviates. The 4iiii is therefore particularly suitable for riders who can do without the few last percent of accuracy.
Compatible bikes and cranks
The power meter is mounted on the inside of the crank arm. Therefore, 10mm space is required between the crank arm and frame. With direct-mount brakes it is often too tight. You can check with a 10mm allen wrench whether a 4iiii power meter fits onto your bike. In the power meter area, the 10mm allen wrench must fit between the frame and crank arm:
The special thing about Shimano: the 4iiii Shimano Dura Ace R9200 power meter fits not only to cranks of the same series, but to all Hollowtech II road cranks (eg 105 or Ultegra).
Since Shimano gear is most often found on road bikes, the 4iiii Dura Ace R9200 power meter is ideal for bringing it along to a training camp - provided that the rental bike also has a Hollowtech II road crankset.
Compatible bike computers and smartphones
Thanks to ANT + and Bluetooth Smart, the 4iiii power meter is compatible with all ANT + enabled bike computers and smartphones with Bluetooth Smart technology. With Bluetooth Smart, the 4iiii power meter works with Zwift, TrainerRoad, Rouvy, The Sufferfest and other indoor-training apps.
Construction and design
The left-hand 4iiii power meter sits well protected in a flat plastic housing on the inside of the left crank arm. Not everyone has a perfect pedal stroke. The forces acting on the pedal crank change when you sit, stand to climb a steep hill, or sprint. In addition, the way your legs apply force to the pedals changes as you become fatigued. To ensure that the force applied to your crank is measured precisely, 4iiii uses a patented 3D strain gauge technology. Power is measured by lateral flex, pull and twist of the crank. Cadence is measured using accelerometers. The 4iiii Powermeter is permanently connected to the left crank arm. This is therefore always included in the pack. The 4iiii Powermeter has the water resistance class IPX7.
The 4iiii Shimano Dura Ace R9200 power meter is powered by a standard CR2032 button cell. A battery is sufficient for about 200 hours of operation time. The CR2032 is widely used and inexpensive. It is available at almost every supermarket. The battery can be changed without tools. The LED on the power meter provides information about the battery level.
The actually power meter has a low weight of just 9g and is the lightes power meter on the market.
We were able to confirm the accuracy of +-1% several times on our calibrated Cyclus II ergometer in the laboratory and in comparison with other power meters on the road. The measurement accuracy must be put into perspective somewhat, since the measurement is only one-sided.
The cadence is determined by means of an accelerometer and an integrated ring laser and transmitted to the bike computer or smartphone. An additional cadence sensor is no longer necessary.
When temperatures change, different materials expand differently. This can have a significant impact on the measurement accuracy of a power meter, as the strain gauges react to even the smallest changes. The 4iiii power meter therefore has active temperature compensation. This means that it delivers precise measurements even when temperatures change.
Each individual 4iiii power meter is individually calibrated at the factory. Something else is the zero calibration (also called "Zero Offset" or "Manual Zero"), which should be done before every ride. This is similar to a scale that also "zeros" itself before weighing. For zero calibration, the 4iiii power meter must be active and connected to the bike computer or smartphone. The zero calibration can be performed on the bike computer or smartphone.
Setup / Firmware Updates
Unlike other power meters, the 4iiii power meter does not need to be specially set up or registered. The correct crank length is already stored in the power meter. Firmware updates require the 4iiii App (Android & IOS) and a smartphone. We recommend always using the latest firmware of the power meter and the cycling computer.
The installation of the 4iiii power meter is very simple. The left crank arm of your crank is simply replaced by the 4iiii crank arm. For the 4iiii Shimano Dura Ace R9200 power meter you need a 5mm allen wrench and the Shimano TL-FC16 crank assembly tool. It's needed to loosen or tighten the bolt that pulls the left crank onto the axle.
We have made good experiences with the durability of the 4iiii power meter. Due to its placement on the inside of the left crank, the power meter is well protected against mechanical influences. In a crash, for example, a pedal power meter usually gets somewhat beaten up. This is where the 4iiii can score.
Warranty and support
The 4iiii power meter comes with a 3 manufacturer's year warranty. The 4iiii power meters are manufactured in Canada. 4iiii also has European distribution in the Netherlands. If there is ever a problem, we have a direct line to 4iiii Europe and can help you quickly.
left crank arm
adds 9gr to left crank arm
about 800 hours (CR2032)
ANT+, Bluetooth Smart Ready
0 to 50°C
-40 to 60°C
Training Peaks, Strava, Garmin Training Center and others
Power Range (Watts):
0 to 4000
Cadence range (rpm):
Shimano Hollowtech II Road
165, 170, 172.5, 175mm
Active temperature compensation
Accelerometer based cadence measurement
In the pack
✔ 4iiii Dura Ace R9200 Precision 3 power meter
✔ Left crank arm
|Carbon or aluminum:
|Single or double sided:
|Road or MTB: