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4iiii Power Meters

Image of the 4iiii Innovations logo

4iiii power meters, available for both Shimano road and MTB cranksets, are some of our best-selling units. This is largely due to their affordability, ease of installation and accuracy. The company offers left side crank arms as well as complete cranksets. With the left side crank arm, the user simply swaps their current crank arm out for the power equipped version. With the dual-sided cranksets, the existing crankset is replaced with the new one. These power meters are accurate to within 1.0% and feature ANT+ and Bluetooth SMART. The PRECISION models use CR2032 coin cell batteries while the Podium power meters use rechargeable batteries.

Additional Information:

Installation

Installation of the PRECISION and Podium left crank arms is very easy. You simply remove your current crank arm and install the 4iiii power meter in its place. Installation time is usually under 5 minutes.

4iiii cranksets take a bit more work as you have to swap out your entire crankset, however assuming you have insured compatibility with your bike frame and bottom bracket – it’s still pretty simple. Installation time here is probably closer to 30 minutes. Please note that for both power meter types, you will need a Shimano preload cap tool to remove the left side crank arm.

Weight

4iiii power meters are the lightest power meter available. The Podium sensors add a mere 7.5 grams of weight, while the PRECISION sensors add only 9 grams.

Power Measurement

Like other left side power meters, the PRECISION and Podium left crank arms measure left leg power and double the value to calculate total power. Assuming you don’t have a significant left/right leg imbalance, this is an accurate way to measure power. Complete 4iiii crankset power meters measure both legs. They are therefore able to account for any left/right imbalances. They are also able to determine independent left/right power.

Special Features

Several features stand out regarding 4iiii power meters. To begin with, with models starting at $299, they are one of the most affordable, ready to ride direct force power meters available. They are also extremely lightweight. These power meters add less than 10 grams of weight to your crankset. In addition, they offer high levels of accuracy (+/- 1.0%).

Batteries

The PRECISION uses a CR2032 battery. CR2032 batteries are cheap and easy to find. Battery life is right around the 100-hour mark. The Podium uses a rechargeable battery with approximately 60 hours of battery life.

Communication Protocol

These power meters transmit data via both the ANT+ and Bluetooth SMART wireless protocols. This means they are compatible with any bicycle computer, smart phone or tablet.

Accuracy

4iiii power meters are accurate to within +/- 1.0%. This is on par (to slightly better) than the majority of other power meters on the market.

Cadence Detection

Like most power meters, the PRECISION and Podium use an accelerometer to measure cadence. An accelerometer is an electronic device that is housed inside the power sensor and measures your pedaling rate.

Warranty

4iiii power meters come with a three-year warranty which covers the product from defects in material and workmanship. We note that this is longer than the typical warranty of one to two years.

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