Hmmmm. Thanks.

I'm thinking now I should get a trainer that definitely measures power output and use the polar for measuring power when I'm outside riding. I can understand how those sensors can move and slide down the cranks- I have that problem with my bike computers too, and it's a pain in the freakin' butt.

That's good to know. I won't waste my time getting the Polar power output thing and just concentrate on getting a trainer that measures power instead.

Thanks again, everyone!

Koffee