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Polar Power kit....reliable, accurate, etc.?(3 posts)

Polar Power kit....reliable, accurate, etc.?SS_MB-7
Jan 29, 2003 6:39 AM
I'm thinking about buying the Polar Power kit to compliment my S-710 for use on my trainer during indoor workouts.

I'm curious how reliable and accurate the kit is, considering the price.

Anybody using? Would you recommend it?

Ride Hard,
Mike B.
I like it pretty wellduckstrap
Jan 29, 2003 7:36 AM
I've been reasonably happy with mine. It's hard to tell how accurate it is, since I don't have a gold standard to compare with, but it is reasonably consistent ride to ride in the same gear, same pace, etc. For me it was less expensive and less hassle to install than the others, i.e. SRM or powertap. I use it mostly to gauge progress, and measure how hard particular efforts are. I haven't used it much for power-based training, since individual readings vary 10-20 watts, and it seems more familiar to use HR. These fluctuations get averaged out when you download into the software, and I really like the simultaneous display of elevation, HR, speed, cadence and power.

One thing that you will need to pay attention to, however, is the distance from the power unit to the chain, especially in the big ring, big cog combinations. I noticed a pretty profound apparent power drop-off (i.e. >20%) going up the same hill at the same speed when I switched from the little ring to the big ring. The documentation says that the max distance to the chain should be no more than 30 mm in any gear combination. They mean it. For my setup (Trek 5100, 51 cm), this meant that I needed to make up 2 ~1cm spacers out of old inner tubes to put the power unit in the right position relative to the chain.

So overall, I would recommend it, but it did take a while to get it dialed in to where I'm beginning to feel the relationship between power output and how I percieve the effort.

Good Luck!
Thanks for your excellent reply (nm)SS_MB-7
Jan 29, 2003 8:02 AM