Here's some info from Shane of TireRack.com
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18" is the largest that we have tested to fit on the Cruiser.
Here is a breakdown of sizes:
18" staggered combo:
225/40-18 front, 245/(35or40)-18 on rear.
same size all the way around:
235/40-18 or 225/40-18
17" staggered combo:
225/45-17or205/50-17 FR., 245/(40or45)-17 RE.
Same size all the way around:
235/45-17 or 225/45-17
Let me know if you need any clarifications. On the rear sizes where I list two different profile possibilities, the first profile (lower profile) would be the same overall diameter as the front size. The second profile(higher profile) would be a little taller than the front size listed, giving you a wider and taller look on the rear. All of these sizes listed are acceptable even with ABS as it falls within the 3% differential needed so that ABS is still functional.
Shane@tirerack.com
Performance Specialist
When ordering from The Tire Rack
Please reference "SHANE EXT 341"
Or call me direct 800 428 8355 ext 341
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jody