Kinda? (Northern California). No to storing by a heater. Almost every Maxxis tire I've had in the last couple years has been or gotten warped, especially in the rear. EXO+, DD, and DH casing. No, I don't use tire levers to install, although I do remove them with them. In the fall I tried Schwalbe again, and only 1/4 of those tires has gotten warped (Super Trail Big Betty), so I guess that's an improvement. I'm interested in trying the Contis also (from the reports of better durability and faster rolling speed), but finding an MX set in stock is...