The E 3 radials are very expensive (at least to my wallet). I am running the bias tires and am very happy so far. As far as I know, most of the user reports are for the bias tires. Bikebandit has them for a very competitive price, got a pair, one each front and rear, for around @220 total. Might have been a bit more with freight, it has been almost a year now since I bought them. Oh, I have an 08 RK, so no fat rear tire.