Tire width Relation

[baz67]

What are you giving up for the 285 to fit? Generally the wider the better. However you need to address things like turning radius(looks like you are addressing that), fender clearance, scrub radius and power steering upgrades.

The two key ones that I have mentioned are scrub radius and the power steering. If you increase tire width without increasing bacspacing you will increase scrub radius. The more scrub radius you have the twitchier(if that is a word) the car will feel because increasing scrub radius adds more twisting force to the geometry. I am not sure how much it would increase in your application, but it should be one thing to minimize. Also, by increasing scrub radius you increase the load on the power steering. The tire width change, alone, increases the load on the power steering.

Brian