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i own one now and have owned one prior, but never realt ridden either offroad.
without guards fitted, you can fit a huge pair off 700c tyres.
so how much use would a surly lht be as a rigid offroad bike.
the tubeset seems pretty bombproof, and on paper they do not seem disimilar to the k monkey.
I suppose it depends on how you define off road. My LHT was strong enough for me to use on maybe 80 miles of gravel road during an otherwise on road USA tour.
I'm 16 stone, was carrying a 30-40 pound load and was riding 700x32s. So I think lighter riders on bigger tyres and strong wheels could use an LHT offroad without it breaking. As a tourer of course it has a low BB height which would cause issues on anything too technical.
This [url= http://forums.mtbr.com/showthread.php?t=451468 ]thread[/url] on mtbr was a really interesting read for me. I think you wouldn't have any trouble as long as you weren't trying anything too rough.