I take it that it is a standard tyre? If so it`s a 180 section and nothing to worry about with regards getting a trailer for it.
One thing I would suggest is that you buy a trailer with a support bracket for the front wheel, otherwise they are a pig to fasten down securely, something like this,
http://www.trailertek.com/trailers_motorcycle.php
"May the roads rise with you, and may the wind be always at your back."
Only 80 days until TT2008.
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