The Verve InfoCrank power meter is the most accurate power meter you can buy – period. The InfoCrank achieves its unmatched accuracy and consistency by placing its strain gauges within the crank arm – the only power meter manufacturer to do this. This unique location places the strain gauges directly in the path of torque so that the tangential force which pushes the bike forwards – not the twisting of the cranks, registers the output. This makes it accurate to within +/- 0.5% all the way up to 3,000 watts – the best accuracy of any power meter. In addition, the InfoCrank locates a power meter on each crank arm, which gives it the ability to measure left and right power independently. It is also the only power meter to use CPS technology to measures cadence. This means no magnet and precise cadence measurement.
Installation of the InfoCrank is similar to that of a normal crankset. Power meters that require you to remove the crank take more time and effort than say, pedal-based power meters. However, as long as you follow the compatibility guide (above) and you’re at least somewhat good with bike tools, the installation process is pretty straight-forward.
InfoCrank arms (left and right, including spider and spindle) weigh in at 694 grams. With the chainrings (140 grams) and M30 bottom bracket (130 grams), the total weight is 964 grams.
Left/Right Power Measurement
The InfoCrank locates a power meter on each crank arm, giving it the ability to measure true left and right power. While some power meters provide an estimated left/right power figure, only a select few can provide independent left/right data. Also, the InfoCrank does something else here that is pretty cool. In the event a battery in one of the crank arms dies (say your left side crank arm), power data will continue to be broadcast out of the right side crank arm, and the power meter will recognize the situation and automatically double your right side power. Therefore, while your left vs. right analysis will drop, the power meter will still transmit a total power figure.
The Verve InfoCrank uses SR44 silver oxide batteries, as opposed to the batteries you typically find in power meters such as CR2032, AA or AAA. Verve they went with SR44 batteries due to their smaller size. As the module which houses the batteries and strain gauges is integrated into the crank arm, Verve Cycling was able to best maintain the integrity of the crank arm using a smaller diameter battery. Note to make sure you purchase silver oxide batteries, not LR44 which are alkaline. Alkaline batteries will be drained in your InfoCrank within 2 – 5 days.
The battery life is excellent for the Verve InfoCrank M30 power meter, which runs for approximately 500 hours on a set of batteries, vs. an average of approximately 300-350 hours for other power meters.
Difficulty to Change
The InfoCrank takes two batteries per crank arm and they are accessible and easy to change.
The Verve InfoCrank transmits data via the ANT+ wireless protocol so the power meter will be compatible with any head unit that supports ANT+, including Verve’s own O’Synce’s Navi2Coach computer. Note that in order to get left/right data, you will need a head unit that supports this functionality. The majority of head units produced in the last few years do so – and of course so does Verve’s O’Synce’s Navi2Coach computer.
The InfoCrank is accurate to within +/- 0.5%, all the way up to 3,000 watts. With most manufacturers claiming an accuracy of +/- 1.5-2%, this makes the InfoCrank the most accurate power meter on the market.
Initially, the Verve InfoCrank measured cadence using a magnet and a reed switch, however the company has recently developed a new algorithm for recording cadence. Verve Cycling has figured out a way to measure cadence internal to the cranks, using the strain gauges to read the tangential load. The new algorithm uses Crank Position System (CPS) technology, which is able to accurately detect cadence pulses regardless of power or pedaling style. With CPS, you have the accuracy of a magnet without having to have one mounted to your bike.
Note that battery life decreases slightly with this update, as each crank arm has to continuously check load inputs in order to detect movement. Verve hasn’t quantified the decrease but calls it “slight”. In addition, the process for waking up the power meter after replacing batteries is a bit different. You now must wave a magnet over the sensor on one crank arm in order to wake it up; at which point you wait 5 minutes for the power meter to fall back sleep, and then you’re good to go.
Verve’s new CPS technology comes standard on all new InfoCranks and can be downloaded via a free RevUp firmware download for use on all existing units.
With most power meters, you need to perform a zero-offset before every ride in order to ensure the power readings are accurate. However with the InfoCrank, this procedure is not necessary. This is because the strain gauges in the InfoCrank are insensitive to temperature changes. It’s a get on and go power meter.
The Verve InfoCrank comes with a standard 2 year warranty.