New wheel...

[DoubleA]

Hey guys, I have a 2004 X5 4.4i for a little over a year now and very happy with the X. When I bought it last year, I also bought 4 new shoes 255-55-18 but once the summer is over so the tire are, I did 2 summer with those.

In the next few months I'm going to buy a new set of wheel for spring 2011. I'm thinking of 20's staggered, 20 x 8.5 front and 20 x 9.5 rear, now what would be the ideal tire size ? I've did much research but came with different option, in order to keep the speedometer as accurate as possible, what do you think of these size which will throw the speedo off by less than 1%, so my idea is to get 275/50/20 front and 305/45/20 rear does that make sense ?

Thanks for any good advise beside telling me to search. Lol

AA