I'm assuming by your signature that you have a 2000 model Xterra and therefore have 15" wheel. I believe the TrXus has only 1 tire size available at the moment for a 15" rim: 31x10.5R-15. The next size coming out for a 15" rim is 33x12.5 which will not fit without any alterations to your X or suspsension.

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Paul Crescini
http://www.lil-pino.com/xterra.html