alignment wrong?

Could broken shifted belts cause it to ride rough? It doesn't seem to pull but does tend to drift to the left slightly. I only have a month left in this cruising season, so I plan on driving cautiously (the group I cruise with mainly cruises back road and runs around 55mph and spreads out so we don't block traffic) and get new tires this winter/next spring, and will get it realigned(at a different shop). OK this one may sounds nuts and might not mean anything, but I swear when I spin the passenger side front wheel it sounds like there is a handful of bb's in the tires.