The tires were the non marking grey made by Solid Deal. Have been using the same brand for at least 4 years. I feel the heat is coming from the differential. This diff has internal disc brakes in oil. Just wandering if any of the Hyster dealer guys have ran into a heat problem with this model? Two new tires separating in 5-6 days on the same side of the same unit, just hard to think it's the tires. When we get a good tire installed, we can monitor th temperature and try to figure out why.