biggest tire size?

[Riff Raff]

Will 32x11R18 (275/65/18) Toyo Open Country A/T's fit with no modifications or trimming?

Yes, the 275/65R18 (32" O.D.) size will fit bolt-on perfect on a OEM Stock non-lifted VX if using the OEM 18x7 rims. You WILL need to trim the front-forward inner cladding very slightly (a tiny triangle trim) due to the 32" O.D. height. I'm currently running the Grabber AT2 in 275/65R18-116S (32" O.D.) w/OEM 18x7 rims on my 100% OEM Stock non-lifted Proton with absolutely no issues. It will totally "fill-up" the huge wheel-well gaps of the VX with pure tire (no gaps).

A word about the Toyo - Open Country A/T in 275/65R18 (32" O.D.). There are six(6) different part numbers for this particular tire:
(1). Part# 300640 (42.3 lbs) OWL
(2). Part# 301640 (47.4 lbs) BSW
(3). Part# 300440 (51.0 lbs) BSW
(4). Part# 300600 (51.2 lbs) OWL
(5). Part# 300680 (51.2 lbs) OWL
(6). Part# 301600 (51.2 lbs) BSW


In the wider; but stubbier 285/60R18 (31.3" O.D.), you WILL also need to trim about the same amount of front-forward inner cladding due to the wider swing-arc of the 285 series. Besides the Toyo - Open Country A/T in 285/60R18, please take a peek at the following tires in the same size before making your final decision:

Cooper - Zeon LTZ (see Photo Gallery of "VX-KAT")
Pro-Comp - All Terrain (see Photo Gallery of "BoarderCross")
BFG - gForce T/A KDW2 (new radical looking street tire)


Major difference between the two sizes:
Pick 275/65R18 for a generous 1.25" ground clearance gain.
Pick 285/60R18 for a slightly wider stance with a modest 0.9" ground clearance gain.

As "CobraJet" mentioned above, if you don't want to trim your front cladding, then pick 285/55R18 (30" O.D.). Although choices in this size are very limited.