You may want to check out:

http://mywebpage.netscape.com/rechung/wattage/rosetta/rosetta.html

Natrin

I have looked at all of the reviews online and they all seem to say. Polar a good value but tough to set up accurately. Also the polar only samples every 5 seconds while to PT every second. Anyone have experience with either unit?

I have a Power-Tap and have been pleased with it. Very easy to set up, seems accurate (although it's hard to tell without an ergometer or a Computrainer to compare against) and great customer service. I've heard that the Polar isn't all that accurate unless you set it up perfectly - which can be a royal pain, but I have no direct experience with them. I do know that Gordo & Rich Strauss recommend the SRM and Power-Tap in that order, but have never seen them recommend the Polar.

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While i've never used a Polar, the reports i've heard about it and the review of it against the SRM in a peer reviewed journal make me feel "nervous" about it's accuracy, see http://www.ncbi.nlm.nih.gov/...31&dopt=Abstract

Anecdotal reports are that is extremely difficult to set up accurately (really requiring either an SRM or PT to ensure it's done correctly). Also, it appears to give very suspect figures when riding on a trainer.

The PT (both standard and Pro) are more accurate than the SRM Amateur and possibly more accurate or certainly the same as the SRM Pro. The SRMs can require lots of calibrating (you need to hang certified masses off the cranks and check the slope calculations) to ensure that the data is valid and accurate, on the other hand the PT doesn't require this (just ensure it's zeroed before every ride, takes < 2-secs).

If you want to use the PT for racing, it can be purchased with a Zipp 303 rim, or you can have it built on to any (or most) rim. The data from racing is certainly useful, and i use mine in all races. It's a great tool (as is the SRM too) and well worth the cost.

Ric

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