Just bought a set of 20's (20x8.5's)off ebay. They come with Achilles ATR's 225x30x20 and are rated 85 on the front. Rears are Nankang NSII's, same spec. I'm not sure which are the one's making the noise, but sh!t, they sound like a plane is taking off. I'm looking around for a decent set of tyres to replace these, but it's much harder than I thought finding good 30 series rubber rated at or above 93W. The majority are rated at 90 or below. If you go up to 35 series rubber, you get no problems with ratings, but it screw's with your speedo and I believe it also won't work for the front wheels. I'll be doin some more ringing and reading tomorrow, but at this stage, might have to resell and go back to 19's simply for sanity's sake.