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Originally Posted by DinanX5
That is encouraging... 
I've wanted to do 10.5s all around for a while now, but I was under the impression that the fronts would rub. (And I could've sworn Tire Rack was one of the nay-sayers... ) I've always thought that the same size tire all around was the best way to go... I want just as much grip in front as in the rear (of course, my camber plates are a big help with that  )
Anyway, my personal feeling is that I'd rather do 295/40s than 315/35s because the the 295/40s generally run about 1/2 inch bigger in diameter. (And while 1/4 inch of additional sidewall height doesn't seem like much in terms of additional road hazzard protection, I think every little bit helps!) The only down-side - and again, I imagine this is pretty minimal - would be that a larger diameter tire/wheel combo will be slower accelerating... plus they might be a touch heavier.
But my thought is that 295s all around will handle and look fantastic!!!!!
So what do you think of the ride with this setup, Jan? I know they're 'winter' tires and all... but having that much rubber on the ground - particularly in the front - must make her grip like a track car!   |
Tire from what I remember isn't that big of a deal weight wise when you're talking about extending another 10mm wide and another percent or two in aspect ratio.
Most of your weight anyways would come from the after market rims. Remember rotational intertia from Physics? You'd be a lot better off saving a few pounds off your wheels (because it's a lot easier there).
Another thing I'm sure you've thought about but forgot to mention is overall aspect ratio versus stock. Try to keep the same overall total rolling diameter. If you run different sizes it might mess up the AWD on the X5 (I read about 4Matic units getting messed up from folks running staggered setups, I'm not sure how the AWD is setup on our car, but I'd rather play safe than not..)