A better size is 275/70/16.
It fits fine, and works much better than the 235.
Its a hair larger in diameter than 31".
Some all season's that work well are the Bridgestone REVO AT and the Michelin Cross-Terrain.
If you wanted to off road, the BFG AT ko is a good choice as well.
Enjoy!
_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif