I have a 07 700 DS. I am looking to get new tires and possibly rims. I'd like to get a fatter tire. After a year of use I think Im ready. So here's my question (s).Can I get a bigger tire on my current rims or will I have to change those as well? The other, how big (tires) can I go so I dont rub on the rear suspension and front fork.. The specs...

Tire: 26x47/52
Wheel: 559x18
606 1H - T6

WTB 2.1

So any input from anyone would be fantastic..