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depends.... 265 on 10+38 and 0 deg camber + guards level with tyres will require a roll and a bit of a push, more than just a lip.

depends on how agressive you go.

285 and you will have to be fairly aggressive or flare

33gtst guards are fairly generous when rolling,

I'd say you would easily be able to get the 265's without flaring as long as you pump the whole guard out a bit.

need to roll then set the guard roller high up in the guard and use it to push the whole area.

I had 18 x 9.5 +12 w 235/40 and tyres tucked a little with almost 0 camber and 0 scrub from pumping the guards

this is slightly more aggressive than what you are looking at with the 265's and with 285's the outside top edge of the tyre will sit in approximately the same spot, but with a slightly bulged sidewall.

reference:

http://www.willtheyfit.com/index.php?width=235&aspect=40&diameter=18&wheelwidth=9.5&offset=12&width2=285&aspect2=35&diameter2=18&wheelwidth2=10&offset2=38#content

so yeah, for the 285's it's possible without flaring but you would need a serious pump

The 34 took 275/35 on the rear with no hassle at all, the 285 have a larger rolling diameter too, 265/35 is closest to factory i think...

Run 265, roll the guards and don't be afraid of using a bit of neg camber (-0.5°).

I run this setup and it hooks up OKish with 265 RSR, well once its through 3rd anyhow, with a better tyre and better throttle control i think itll be pretty good!

Brief update, which seems kind of relevant given recent questions on 265s.

This is 18x10 +38 with 265/35. Have recently had suspension adjusted and now at zero camber on rear. Before was more than 2deg, didn't realise was that much :blink:

Still no problems at all with rubbing after adjustment, have had a fairly light roll, no pull or flare.

Before and after

post-83859-0-02147100-1392812089_thumb.jpgpost-83859-0-69803500-1392812124_thumb.jpg

View from the top. Poking by maybe 5 mm.

post-83859-0-79516000-1392812175_thumb.jpg

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