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@Brommers
Right, I finally got time to fit and have a (quick) test of my Riken power meter at the weekend. Nothing to report fitting it - it's a GXP crankset - and I used the bottom-bracket mounted magnet. It paired up with my Edge 800 perfectly, and calibration was also easy from the Garmin.
The data output seems sensible and in line with what I'd expect from my Powertap wheel. The last four minutes of Sunday's climb shows this:
http://www.zen118609.zen.co.uk/powerdata.jpg
Looks about right. The power drops off during the flat bit before the final ramp, as I start slacking, then heads up to where it previously was, and then ramps up as the end as I get on the pedals for the final ramp, before dawdling to a halt.
Can't say how waterproof/rain-resistant the Riken is. No doubt that will change in due course.