the first number (205,215) is the width in millimeters. the second number (65, 70, 75) is the aspect ratio (or percentage) of the side wall to the width of the tire. so a 205/70 tire would have a side wall height of about 143.5mm, and a 215/70 tire would have a sidewall height of about 150.5mm.
as far as a LRR tire that works in the snow, it seems like every other snow tire made by a major brand is LRR. as far as the best all season tire i'm hoping the michelin defender does well as they're replacing their harmony line with it, but i'm guessing its rolling resistance would be in the poorer spectrum of lrr tires. they haven't been out long enough for anyone to have them in snow yet, echo-francis has some and i'm hoping he finds out this fall before i have to replace my current tires.
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