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4iiii RX810 GRX NDS Precision 3 Power Meter
- Trustpilot rating 4.7/5
- Easy returns
Ask a question about this product
Specifications
Specifications
| Brand | 4iiii | |
| Battery Type | CR2032 | |
| Application | Gravel / Cyclocross | |
| Single-/dual sided | Single-sided | |
| Measuring Position | Crank | |
| Power Source | Battery | |
| Compatible with | Shimano | |
| Cadence | Yes | |
| Compatibility | Yes, with cycling navigation with Bluetooth/ANT+ / ANT+ |
Exact measurement
The Precision 3 Power meter gives a very precise reading with a deviation of only 1%. The force you apply causes the crank to bend and rotate in all three dimensions. To ensure that every force you exert on your pedal is measured in every dimension, 4iiii has developed the 3D power measurement system. This measurement system measures multi-dimensional load, so you can be confident that your unique pedal stroke will still be accurately measured regardless of your riding conditions.
Single-sided power meter
The 4iiii RX810 power meter measures power on the left crank and counts it twice to give you total power over both legs. For most riders without limitations, the power on the left and right leg is almost the same with equal efforts. Your cadence is also measured as standard.
Lightweight
Due to its very lightweight design, the sensor only adds 9 grams to a standard Shimano crank. This makes it the lightest power meter on the market!
Battery life
The 4iiii has no internal battery, but uses button cell batteries. The downside is that you do need to change them occasionally. Fortunately, the battery lasts for over 800 hours, which is a lot longer than most internal batteries in power meters and its predecessor. If the battery is below 15% you get a notification in the 4iiii Device Configuration. So you are always on time with your battery change.
Connectivity
The calibration is done via 4iiii Device Configuration. This app is available for Android and IOS. Through this app you can also see the status of the CR2032 button cell battery. This power meter sends both an ANT+ and a Bluetooth signal. This makes this power meter compatible with almost all bicycle computers. If you are not sure if your cycling computer or sports watch is compatible, you can check the user manual of your computer to see if it is compatible with ANT+ or Bluetooth and with power measurement.
• Measurement deviation: ±1%
• Power supply: CR2032 (up to 800 hours)
• 3-year warranty
• Water resistance degree IPX7
• Active temperature compensation
• Power range: 0-4000W
• Cadence range: 30-150RPM
The part of the crank on which the power meter is mounted protrudes slightly from the original crank. This can cause problems with some bicycle frames. You can perform a test to determine whether your frame is compatible. To do this, you need to be able to move a AAA battery vertically between your crank arm and the chainstay. There is an image on the last product photo of this page to check this. Optionally, 4iiii website also has a handy document that you can print out and stick on your crank. Then you know exactly between which points the AAA battery must be able to pass. When there is enough space for the battery, you can assume that the 4iiii Powermeter is compatible with your frame!
- 1x CR2032 button cell battery
1. Remove the pedal on the left-hand side.
2. Loosen the two crank bolts at the top of the crank arm and remove the safety pin from the slot.
3. Then remove the crank bolt with this crank tool.
4. Now the crank arm is loose and you can remove it from the axle. You may have to apply a lot of force here. The most important thing is that you do not damage the crank arm.
5. Next, install the powermeter crank arm by following the steps above in reverse order.
6. Then don't forget to fit your pedal to the new crank arm and you are ready to ride!
You can also have a look at this blogabout how to replace a crankset. Of course, you then only have to follow the steps concerning the left crank arm.
Crank length refers to the length of the crank arm and is measured from the centre of the bottom bracket to the centre of the pedal axle. Bicycles are usually delivered with the correct crank arm length for the corresponding body size. In most cases, the length is indicated on the inside of the crank arm. Otherwise, you can measure it yourself. It is important that the crank arm powermeter you purchase has the same length as your current crank arms.
What software and/or hardware is this power meter compatible with?
This power meter sends both an ANT+ and Bluetooth signal. Therefore this power meter is compatible with most current bike computers. However, not all computers are compatible with a power meter. For this, you have to consult the specifications of your bike computer.
The common models of Garmin and Wahoo are in any case almost all connectable. The Garmin Edge Explore cannot be paired with a power meter.
Compatible device (among others) are:
Garmin Edge 130, 520, 530, 820, 830, 1020 &1030
Wahoo ELEMNT and ELEMNT ROAM
If you don't have a cycling computer you can also use the 4iiii app to track your workout power data.
How do I calibrate this power meter?
Calibrating your power meter is very important to measure your power accurately. Make sure there is no weight on the pedals and that your right crank is up and your left crank is down (positioned vertically). Rotate the powermeter a few times so that it turns on. Then you can easily calibrate your powermeter via the 4iiii app. Another possibility is to calibrate your powermeter via your cycling computer. Most bike computers have this option, check the user manual of your bike computer to find out how to do this.
Reviews
Reviews
5 / 5
Good and inexpensive form of watt measurement
Since I am used to continuous power measurement through training on the Smart-Trainer and orientate myself on it during training, I also wanted a possibility on my gravel bike. To be honest, pedal systems were too expensive for me and I ride for fun and pleasure - however, I find a control over the power quite charming especially on long bike-packing tours with >100km / day, in order not to be completely exhausted at the end of the day and to better manage the forces.... this seems to work reliably with the system from 4iiii and thus I am more than satisfied with the choice of measurement so far. More than sufficient for me and my needs...the serious amateur athlete or professional will certainly have to resort to double-sided measurement.
5 / 5
Good and inexpensive form of watt measurement
Since I am used to continuous power measurement through training on the Smart-Trainer and orientate myself on it during training, I also wanted a possibility on my gravel bike. To be honest, pedal systems were too expensive for me and I ride for fun and pleasure - however, I find a control over the power quite charming especially on long bike-packing tours with >100km / day, in order not to be completely exhausted at the end of the day and to better manage the forces.... this seems to work reliably with the system from 4iiii and thus I am more than satisfied with the choice of measurement so far. More than sufficient for me and my needs...the serious amateur athlete or professional will certainly have to resort to double-sided measurement.
5 / 5
Top product.
I am very satisfied with the powermeter. For my Gravel (which sometimes has to be left outside at work) I was looking for a power meter that is permanently installed on the bike. Normally I prefer pedal-based systems. 4iiii is the top manufacturer for me and I am very satisfied.
5 / 5
Nice gauge to improve your workouts
Nice design, no difference from the Shimano GRX crank that was replaced. Easy to mount, you do need a crank wrench (Shimano Crank Wrench Hollowtech TL-FC16 FC-M960) to loosen the crank. If you don't have one, don't forget to order it. According to the instruction film, you can remove your pedal from the crank after you remove the crank from the bike. In my experience, it's better to take your pedal off first and then the crank. The meter is easy to pair with the Garmin Edge as well as the 4iii app. Once connected, don't forget to calibrate briefly and then you are good to go. After using it a few times I am very excited about training on power with this powermeter!
Pros & Cons
5
Good and inexpensive form of watt measurement
Since I am used to continuous power measurement through training on the Smart-Trainer and orientate myself on it during training, I also wanted a possibility on my gravel bike. To be honest, pedal systems were too expensive for me and I ride for fun and pleasure - however, I find a control over the power quite charming especially on long bike-packing tours with >100km / day, in order not to be completely exhausted at the end of the day and to better manage the forces.... this seems to work reliably with the system from 4iiii and thus I am more than satisfied with the choice of measurement so far. More than sufficient for me and my needs...the serious amateur athlete or professional will certainly have to resort to double-sided measurement.
5
Good and inexpensive form of watt measurement
Since I am used to continuous power measurement through training on the Smart-Trainer and orientate myself on it during training, I also wanted a possibility on my gravel bike. To be honest, pedal systems were too expensive for me and I ride for fun and pleasure - however, I find a control over the power quite charming especially on long bike-packing tours with >100km / day, in order not to be completely exhausted at the end of the day and to better manage the forces.... this seems to work reliably with the system from 4iiii and thus I am more than satisfied with the choice of measurement so far. More than sufficient for me and my needs...the serious amateur athlete or professional will certainly have to resort to double-sided measurement.
5
Top product.
I am very satisfied with the powermeter. For my Gravel (which sometimes has to be left outside at work) I was looking for a power meter that is permanently installed on the bike. Normally I prefer pedal-based systems. 4iiii is the top manufacturer for me and I am very satisfied.
5
Nice gauge to improve your workouts
Nice design, no difference from the Shimano GRX crank that was replaced. Easy to mount, you do need a crank wrench (Shimano Crank Wrench Hollowtech TL-FC16 FC-M960) to loosen the crank. If you don't have one, don't forget to order it. According to the instruction film, you can remove your pedal from the crank after you remove the crank from the bike. In my experience, it's better to take your pedal off first and then the crank. The meter is easy to pair with the Garmin Edge as well as the 4iii app. Once connected, don't forget to calibrate briefly and then you are good to go. After using it a few times I am very excited about training on power with this powermeter!
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Design
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Easy to assemble
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Works well
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| 3 reviews | 5 reviews | 17 reviews | 18 reviews | |
| Battery Type | CR2032 | Rechargeable battery | CR2032 | |
| Application | Gravel / Cyclocross | Road | Road / Gravel / Cyclocross | Road |
| Single-/dual sided | Single-sided | Single-sided / Dual-sided | Single-sided | Single-sided / Dual-sided |
| Measuring Position | Crank | Pedal | Crank | Pedal |
| Power Source | Battery | Rechargeable battery | Battery | Rechargeable battery |
| Compatible with | Shimano | Shimano Hollowtech II | ||
| 378,15 | From 465,70 | 378,52 | From 466,68 | |
| This product | View product | View product | View product |