Okay, so a minor bonehead move. Still irritating:
Putting new tires on my Univega, I noticed the label wasn't on the drive side. Weird. Thought I checked that. Went to flip it around and oh hey, labels on both sides! Okay I'm good.
Later, stopped at a light, I noticed that the tread didn't seem to look right. Confirmed later, yep, the rotation arrow was pointed in the wrong direction. Crap. How about the rear? Dammit. 50/50 shot at each and I got 'em both going the wrong way. Curse the marketing genius who asked "how come we're only branded on one side of the tire?"
Yeah, I know this "tread" has no real impact on anything. But I still flipped both tires around. And oblivious often means twice the effort.
