Join Date: Apr 2002
Location: Montréal (Québec)
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I'm not sure whether there is a weight difference. Maybe the Shimano website would give you that spec. As far as I know, the XT hub has slightly better seals than the LX hub, but I have both and both looked clean after two or three years of all-weather cycling.
Another difference : the XT is supposed to have harder bearings, which means that it should run smooth longer. If you're doing lots of mileage, it would make a difference a few years down the road.
As for wheelset strength, both hubs have very similar (maybe identical) specs, so a wheel you build with similar components would be equally strong whether you use LX or XT.
One last point to check: colour. Many years ago, the LX hubs were dark grey while the XT were available in dark grey and silver. No idea if this still is the case.