4iiii power meters, available for both Shimano road and MTB cranksets, are some of our best-selling units. All models are accurate to within 1.0% and feature ANT+ and Bluetooth SMART compatibility. The PRECISION models use CR2032 coin cell batteries while the newer Podium power meters use rechargeable batteries.
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. You will need a Shimano preload cap tool for this. 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 – it’s pretty straightforward.
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. Complete 4iiii crankset power meters measure both legs and are also able to determine independent left/right power.
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 one-year warranty which covers the product from defects in material and workmanship.