285/65R18 on a Toyota Tacoma.

285/65R18 at 32.6 in is past the modeled stock-height ceiling for a 2nd gen Tacoma (265/70R16 (~30.6 in)), so the conservative read this page publishes is a 3 in suspension lift. At that tier the matrix models 285/75R16 (33s, about 32.8 in), and the clearance work it lists is fender liner trim and cab mount chop for full articulation, with gearing flagged at 4.56-4.88.

The candidate table is the looser of the two for 285/65R18: it clears the size at Level / 1-2 in with minor changes, which the 2nd gen Tacoma ceiling above does not support. That table rates a size on its own terms — the rule-set's own generation-agnostic description of the size reads "Near-33-inch 18-inch fitment with more width than stock." — with no generation column to narrow it, so where the two disagree this page publishes the matrix tier.

One sourcing caveat for the 2nd gen Tacoma: our per-year fitment rows start at 2017, so nothing in this repo assigns 285/65R18 to a 2005-2015 trim. The 18-inch family we list for that span is a long-running community-documented pattern, not a verified per-year spec, and the ceilings above are the estimator's rule-set for the generation rather than measurements from a 2005-2015 truck.

285/65R18 at 32.6 in is past the modeled stock-height ceiling for a 3rd gen Tacoma (265/70R17 (~31.6 in)), so the conservative read this page publishes is a 3 in suspension lift. At that tier the matrix models 285/70R17 (33s, about 32.7 in), and the clearance work it lists is fender liner trim / pushback, aftermarket UCAs recommended, and cab mount chop for rub-free off-road, with gearing flagged at 4.56-4.88.

The same disagreement as on the 2nd gen Tacoma applies to 285/65R18 here: the candidate table clears it at Level / 1-2 in with minor changes, the 3rd gen Tacoma ceiling does not reach that far, and the tier above is the matrix's conservative one.

285/65R18 at 32.6 in sits inside the modeled stock-height ceiling for a 4th gen Tacoma (285/70R17 (33s, about 32.7 in)), but our per-size rules do not clear it at factory height, so the conservative read this page publishes is a leveling kit (1-2 in). At that tier the matrix models 285/75R17 (skinny 34s, about 34.0 in), and the clearance work it lists is crash-plate removal (2 bolts, reversible), with gearing flagged at 4.88 if sluggish.

Our two sources disagree here and the conservative one wins: the generation matrix would clear 285/65R18 on a 4th gen Tacoma at stock height, while the per-size candidate table rates it Level / 1-2 in with minor changes. The tier above is the candidate table's, and the rule-set's own description of the size is the reasoning it gives: near-33-inch 18-inch fitment with more width than stock.