31's are just about right on a 95Sr,
That is what we had, still a good snap at full throttle, adequate off-road and the wider footprint helps handling abit. We now have 32x11.5 and they are very nice offroad, but have sucked a little torque. (Bigger tires raise your effective gearing lowering your engine revolution at steady speeds <img border="0" alt="[Nerd]" title="" src="graemlins/nerd.gif" /> this can help mileage on the highway to a point of diminishing returns)

Anywho here is ours in COLo on 31x10.5 michelin-AT. Which I would not recomend, as far as the brand goes, the size was nice though.

<img src="http://pics.montypics.com/fordmontero/2003-05-08/1052422729_Our_Montero_On_Cinnamon_Pass.jpg" alt=" - " />

And here at the house, I should have used a filter on the camera

<img src="http://pics.montypics.com/fordmontero/2003-05-08/1052422844_Montero_3.jpg" alt=" - " />