Those tires due to my weight? You calling me fat? Haha. Do you think I should change them now? I was more worried about the stock wheels holding their own. I am loseing weight steadily but I have a long way to go until I am back to my goal of a built 200.
If they are the standard 23mm tires and you are riding them at their max of 120psi, then you are probably overloading the wheels and the tires, regardless of whether your 280lbs is 90% muscle or 90% fat. Most wheels are designed for up to about 220 lbs, but there is a built in safety cushion. I would keep a close eye on them and have them checked by your local bike shop, preferably the one where you bought the bike, on a regular basis. Ask the local bike shop if they recommend you going to a 25mm or even a 28mm tire that can better handle your weight.
If you give me the brands and models of your tires and wheels I can offer more insight.