4iiii power meter
The US-American sports electronics manufacturer and wearable electronics specialist 4iiii has already caused a sensation with the 4iiii Precision Powermeter, which is to be offered in the American market already for 399 USD, at the presentation at the Interbike in autumn 2014. At the ISPO in Munich in early February, we were able to talk to the 4iiii team about this highly interesting power meter.
This is how the 4iiii Powermeter is structured
At first sight the 4iiii Precision Powermeter resembles a Stages Powermeter. A small plastic box, which is attached (glued) from the inside to the crank arm. As battery a CR2032 button cell is used and the data transfer can be done via ANT+ and Bluetooth.
Here there are some interesting possibilities with the 4iiii Powermeter, which are not offered with the Stages Powermeter currently so:
The 4iiii Powermeter can be mounted on the left crank arm as well as on the right crank arm.
2. the 4iiii Powermeter can be mounted on both crank arms and offers in this setup a full measurement on both sides.
3 The 4iiii Powermeter can be mounted by the dealer after a special training on already existing crank arms at the customer.
4. in a further step, it should even be possible to mount the 4iiii Powermeter at home on the already existing crank arm.
5. the 4iiii Powermeter should work soon also for carbon crank arms.
The manufacturer promises here that the product name 4iiii Precision Powermeter is also program and advertises with a measuring accuracy of less than +-1% - a value which otherwise only the science - Powermeter of SRM can reach.
Besides the advanced data transmission technology and the unique possibility to mount the Powermeter on its own crank, the 4iiii Precision Powermeter offers an active temperature compensation and a battery life of 200 hours (about 5000-6000km at 27,5 - 30 km/h).
Price of the 4iiii Precision Powermeter
Currently only prices for the US American market are known, which is 399 USD for the single sensor (right or left) and 749 USD for the two-sided sensor set (right and left). The Euro prices have not yet been fixed, but in view of the current dollar exchange rate, import duties, shipping costs and a surcharge of 19% - 23% per cent for the sales tax due in Europe, they are likely to be in the range of 400 - 500 € for the single sensor and 800 - 900 € for the double-sided set. This would make them by far the cheapest power meters on the market.
Delivery of the 4iiii Precision Powermeter
The delivery in the USA and Canada is planned for March 2015, when we can offer the new 4iiii Powermeter in Europe, is unfortunately not yet known, but we are still in close contact with 4iiii in the USA.
and will be happy to inform you directly about new products.
In addition to our information, the well-known bike tech blogger DC Rainmaker has of course also been involved with the 4iiii Precision Powermeter and has even been able to test it once.
What DC Rainmaker says about the 4iiii Precision Powermeter
- The assembly of the Powermeter on the own crank arm was very easy and could be done in about 5 minutes (without the drying time for the epoxy resin) and this although the tools and auxiliaries supplied with the test powermeter were still in prototype status.
- Crank compatibility: All aluminium cranks with smooth surface on the inside. This has been tested with several generations of Shimano 105, Ultegra and DuraAce and Deore XT cranks, SRAM Rival and FSA Energy cranks. Rotor cranks are not compatible as they have ribbing on the inside and no smooth surface. Further tests are being carried out in the "Carbon" area, but things are looking good at the moment.
- Required free space on chainstays and chain: The power meter builds up about 9mm on the crank arm, but the positioning on the crank arm is flexible, so you can take the place that fits best.
- Temperature compensation: The 4iiii Powermeter has an active "learning" temperature compensation. This means that the Powermeter sets the Zero-Offset calibration points at different temperatures and "learns" how the measurement technology reacts to temperature changes in individual cases. This is due to the fact that the power meter cannot be calibrated to a temperature curve during the manufacturing process, as this has to be done after installation on the crank arm.
- Water resistance: This is IP65 standard, slightly better than IPX7. The sensors are therefore sufficiently protected against water, even if you spray your bike with a garden hose (not a high-pressure cleaner).
Similar to 4iiii Powermeters, Stages Powermeters are also built up and offer an easy and fast assembly, by replacing the left crank arm. A one-sided measuring alternative that measures pedal-based would be the Favero Assioma Uno. If you are willing to spend a little more money than for a 4iiii power meter, you can get a two-sided power meter for less than 1000,- €. This category includes the Garmin Vector 3 and the Powertap P2, but also the Favero Assioma Duo.
You can find a selection of Pedal Power Meters and Stages Power Meters in our Powermetershop.