My 2001 X5 I bought from the 2nd owner who used it to go skiing - He sold it rather than buying a separate snow tire setup - the Diamaris have virtually no grip in snow because the grooves fill up too quickly with snow and become "racing slicks" - the wider tire also has the car floating on the snow, not digging in as a narrower snow tire would - basically it becomes a 4 wheel toboggan - your 4.4 can take a 17" wheel, but if you want to later opt for aftermarket (bigger) brakes, you will need 18" wheels for clearance - and I'd still get the chains also

__________________
Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
___________
Life is not fair!
You can't protect people from their own stupidity!
Laughter makes life worth living