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Old 07-21-13, 03:41 PM   #1
CanadianBiker32
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Powermeters - Crankset type vs Powertap (hub)

I been looking at powermeters again. I noticed for a lower price one can get those power tap power meters that are in the rear hub.
Now how accurate are the power tap compared to the crankset types?
What problems in readings would i get getting a power tap over the crankset type?

What is more accurate etc?

Do the powermeters make any unusual noise? thanks
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Old 07-21-13, 05:26 PM   #2
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Both the hub-based and crank based power meters are as accurate as you can get. I'm sure the specific products web site will provide the accuracy for their power meters.

In theory, the hub based power meter would be more accurate since they measure the power at the rear hub. Those that measure at the crank set don't consider the drive train losses. In practice, the real difference is probably inconsequential.

Power meters make no noises.

Power Tap pretty much owns the hub based market. SRM and Quarq are popular crank based power meters. Crank arm and pedal/cleat based systems have recently come to market but their reliability and accuracy have not been established.
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Old 07-22-13, 06:49 AM   #3
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Quote:
Originally Posted by bikepro View Post
...In theory, the hub based power meter would be more accurate since they measure the power at the rear hub. Those that measure at the crank set don't consider the drive train losses. In practice, the real difference is probably inconsequential...
I'd turn that around if the intent is to measure the power output of the rider. That said, I agree that the difference is inconsequential for the purposes power meters are general put to.
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Old 07-22-13, 12:54 PM   #4
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I'd turn that around if the intent is to measure the power output of the rider. That said, I agree that the difference is inconsequential for the purposes power meters are general put to.
I was thinking in terms of power delivered to the rear wheel -- hairsplitting in any case.
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