จาก Ducking Tiger
จาก Website Infocrank อธิบายความแม่นยำ
Yes, this power meter is accurate. So you know, here is exactly how accurate it is.
InfoCrank is a torque-sensing system with ±0.2 Nm accuracy for measurements below 20 Nm and ±1% of actual readings for measurements above 20 Nm.
Let's put that into some context. Say riding conditions are 90 rpm with a 300 watt reading (not an unusual operating point for a rider). Say the crank length is 172.5 mm. The maths works out that there is an average torque of around 16 Nm per each crank to produce the 300 watts of power. As this is below the 20 Nm threshold, there is an error band of ±0.2 Nm, which translates to ±1.25%. of the actual displayed value. That means your actual power will be somewhere between 303.8 watts and 296.2 watts. Elite riders typically riding above 400 watts and 90 rpm for time trials would produce results with ±1% of the actual reading.
So accuracy, quoted as a relative value, has to have a reference for us to understand at what point it is actually that accurate. InfoCrank shows you that most of the time you ride the bike with loads that can be measured accurately at ±1%, while other times, because the load is less, it may be rather less accurate, ±1.5 to1.75%.
We went to the effort of getting our accuracy statement externally certified, and we found that InfoCrank is even more accurate than we’re claiming above. Have a look for yourself.
สินค้า White Industries, Performer bike, โทร 0818090160
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