I stand corrected, Si - sorry, I guessed that your qualifier of "I will use this on the road as well" meant that you might be doing lots of 60-70mph riding on tarmac - for which you might find 15psi rather 'limiting' in most respects, because it was your only bike or even your only vehicle. Now it's more clear that those duties are better covered by the Tenere, 15psi is probably a good start-point for trail-riding and the tarmac between the lanes.
Be careful with that comment about 5psi with a rim-lock, though - 5psi is a really minimal pressure for a rear tyre, even with TWO rimlocks (which is popularly considered essential on the rear, for the really low pressures). The tyre coming off the rim is not the only issue, there - it's more to do with rocks or potholes getting really unfriendly with the tube and the rim (especially potholes, because you'll likely be doing a greater speed if hitting the sharp side of one).
Good luck with that revitalised XR.
_________________ If yer in a rut You gotta get out of it, out of it, out of it - out of it! [Basic trail-riding advice from Fox/Jennings/Owen/Ruffy, 1979]
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