Verve InfoCrank power meter test
The Verve InfoCrank is one of the most accurate and robust power meters available
17th March 2017, By Richard Rollinson
As I carry out cycle coaching with power on a daily basis, power meters that are not only accurate but also offer relevant measurement, make the difference between looking at true values in total confidence or just having power data that is consistent over time that could possibly under or over report.
To test multiple power meters against each other, there are some relevant key differences to test for that can be tested with 2 power files on the same ride. Some of the causes can be:
- Where the strain gauges are
- What type of force it is
- How is the crank velocity/ cadence measured
- External forces that may be mistaken but the strain gauges as leg forces
- Long term degradation of materials the strain gauges are fixed to
The Verve InfoCrank offers some different technology to other power meters, which stacks up like this:
- 2 Load cell strain gauges that convert force into electrical current, in each crank arm (4 in total)
- Force measured inside solid aluminum crank arms at closest point to spider
- Force measured at 256 times per second (at 60 rpm)
- Crank velocity/ Cadence measured through crank arm position taken by force measurements
- ANT+ messages transmitted through pods on inside of crank arms
- Measures Torque Effectiveness and Pedal Smoothness
- Measures Tangential forces only (no side or radial forces)
Because the infoCrank strain gauges are build inside a solid crank arm, this means zero flex. The only time there would be flex is if the crank arm was bent and you would know about that if it happened!
Temperature difference occurs when a hollow crank arm or pedal axle expands or contracts with temperature difference. This expansion or contraction is often mistaken for leg forces by power meters bonded to hollow surfaces that can flex.
A house built on solid foundations
Through time, hollow axles and crank arms degradate. This again is another reason that Verve use a solid crank arm, because there is no flex through degradation over time.
Of course, force is only half of the measurement of power. Cadence or Crank Velocity is the other half to this.
The main differences in technology in measuring this to other power meters is the use of accelerometers and the InfoCrank uses the 256 times per second it measures force to know where the crank arm is instead, to measure cadence very precisely.
In conclusion, my curiosity on Verve’s claims has been satisfied as to what are the differences in technology and why they are relevant to accuracy.
I would recommend the InfoCrank. But as to which power meter fits your needs the best depends on what features you are looking for, but consider accuracy first.
The InfoCrank more to someone who wants the most accurate power meter and accuracy of power acceleration detail. It is a fantastic genuine upgrade if you already have a power meter, say a single sided model and want to upgrade to having the most relevant accuracy, also with pedalling economy metrics.
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