agree w/ funrover on this one.
When it comes to getting off the road you are really going to want those 15"'s. Airing down (though not necessary-because ive never had the practical means to reinflate 4 aired down tires) will only really be possible with higher profile tires. The distance from the ground to the rim is too short with the low profile ones and aired down or not, you will probably end up destroying those nice expensive 18"ers on trails.
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