18" wheels are available, but only on the D240 or soon to be released D250. The new D300 or P400 miss out because of the larger brakes.
I've ordered my D240 SE with 18s.
There are much more tyre options available with 20" but you do loose a bit of sidewall. There seem to be a some already running 33s on 20" rims with little or no modifications.
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