As we introduced them to you this spring, Verve Cycling is now delivering the production version of their new power metering crankset, the Infocrank. The power meter can now be ordered online, and is shipped consumer-direct from either their EU, US, or Oceania distribution hubs. Then through a network of worldwide Affiliates, they can work with you to make sure you take full advantage of the power meter’s training capabilities.
Having recently finished final beta testing and now been delivered to early supporters, we had the unique opportunity to borrow a set of the power metering cranks directly from Verve Cycling’s president for just over a week to see what customers could expect. Bryan Taylor lent us his personal Cervélo R3 with the Infocrank installed while he was traveling on business, giving us a chance to go through the new setup process with the included O_synce Navi2coach GPS computer, as well as to pair it with a standard Garmin Edge computer. We tested out the cranks on a few regular mid-length group and solo road rides, as well as giving it a go on some gravel, and even a bout on the indoor trainer. The goal was less about testing the accuracy of the power meter (a point where Verve seems to excel, btw) and more about how a rider might set up and actually use the Infocrank.
Come past the break for the full details and real world weights.
Tech Details & Actual Weights
One of the first things to notice is that Verve focused their involvement on what they do best and that is the technology of building a high quality, precision power meter directly integrated into the load path of their own optimized crankset design. From the beginning Verve honed in on the science behind power metering with a single goal to “measure power accurately”, something they were disappointed to discover was not easy to find on the cycling market where in-lab and real-world results didn’t always agree or remain consistent.
Verve pairs their base cranks with the exceptionally well received Praxis Works forged chainrings and a Praxis bottom bracket (M30 or BSA) leaving those parts to the specialists. They also includes the Navi2coach head unit from German company O_synce (something of an analogue to the Garmin 500) where they were able to have greater input into the development of the user interface and the use of key bilateral metrics.
The 694 gram-claimed Infocrank is a forged 6000 series aluminum crankset with an integral 110 BCD compact spider and machined recesses in each arm housing individual left and right power metering modules.
The cranks are available in 170, 172.5, and 175mm lengths, in a black anodized finish.
The Praxis chainrings are offered in either 50/34 compact or 52/36 semi-compact.
The 30mm Praxis bottom bracket is compatible with either BSA, BB30, PF30, or BB86 frames.
Our sample setup weighed 871g total including the 135g Praxis rings, 10g chainring bolts, and 30g magnets (just 2 grams heavier than the claimed weight.)
Paired with the included cadence magnets (both BB cup mounted magnets like we used and an adhesive-mount magnet are included), the crank translates direct torque (Nm) measurement into power (W) and includes cadence (rpm) tracking. With left and right measurement the Infocrank allows power balance analysis, as well as per pedal torque and pedaling efficiencies not often tracked by other power meters.
The Navi2coach computer is fitted with a 4-point 1/8 turn locking mount exclusive to Verve (and similar to but not compatible with Garmin’s 1/4 turn Edge mount). The Verve-branded computer includes a rubber band handlebar/stem mount and a Barfly out front style mount for 31.8 bars.
A unique feature of the Infocrank is the configuration and factory calibration of the strain gauges directly in the load path between pedal input and crank rotation, meaning there is no need to ever recalibrate the crank during normal use, greatly simplifying operation versus the competition and removing a common opportunity for user error. The design and layout of the strain gauges automatically eliminates data drift over time, compensating for temperature and pressure changes, ensuring that it reliably measures power in all conditions. As a result, Verve is very adamant in reminding that the “accuracy of an InfoCrank will not change over time. This means you DO NOT need to Calibrate using your bike computer, ever.”
The Infocrank power meter was developed in collaboration with the Australian Institute of Sport, who has been responsible for testing accuracy and drift, the defining hallmarks of the Infocrank. By incorporating a Wheatstone bridge arrangement of its strain gauges not sensitive to drift, Verve quotes a resulting accuracy of ±0.2 Nm < 20 Nm and ± 1% > 20 Nm.
That means ±1% for measurements of about 160W and above, while independent tests have measured the max deviation of just over half of that.
With variation regularly ±10% between many of the current power meters on the market, the Infocrank may be a market leader in terms of true accuracy. Always concerned with real-world accuracy, Verve’s head engineer put together a short manifesto on “Why a power meter that’s relatively good is just not good enough.“ Have a look there for an interesting read on the science behind the Infocrank.
Data transfer is wireless by the ANT+ standard allowing pairing with almost any cycling computer, although not all on the market can benefit from full bilateral data streams. Each power measuring module is powered by a user-replaceable button cell battery with a 500 hour operational life.