Wow. Went on one ride. Got home and rear tire exploded. I put about 66 lbs of pressure in it. It was 35 degrees outside and 72 degrees inside (i know warm air expands). Tire exploded about 20 minutes after I brought it inside (thankfully, not when i was riding it).
Since max lbs is 85 lbs of pressure, I thought I was pretty safe.
So, now i need to go to the bike shop.