This is not a big deal, but I just wanted an opinion. I lowered our bikes from the rafters the other day and of course was ready to check and air up the tires. What I noticed was that my wife's tires were down about like I'd expect, as was my front tire, but my rear tire was totally flat. I have a compressor and top up our tires before almost every ride and had no tire problems at all last year.
So should I be proactive and replace the rear tube? Or was this likely just a slow valve-stem leak that persisted over the four months that they've been stored? This is one of those slime-filled tubes (not my choice!), and I've had suspicions that that stuff can get into the valves and affect them (some of it often spurts out just when I put a guage on the valve).