Thanks for the responses everyone - very helpful. Keep the tire pressure up on the pavement; slow down a little; all good stuff.
The reason I ask is; I have a ride coming up, Denver to Northern Montana (pavement from Denver to Mid-Wyoming, mix of dirt and pavement after that). From MT, Divide Trial back down to Central CO. I think the total mileage will be about 2,300; I'm riding an '01 1150GS. Sounds like the TKC80 will work out just fine - might need replacing when I get back; which is fine because I can throw the Tourances back on.
Thanks again for the help.