Yeah, came back to the car one day and had a full flat tire. Bought two used tires for the front (identical), since I'm going to need a full new set of tires once the Peugeots are on. But now the passenger side is a good couple of degrees tilted upward and the car veers to the left if I let go of the wheel. The car also starts shuddering a good bit once I get up into the 50-70 mph range.

 

Can this be solved with an alignment? Or could it be more serious?

Might want to check and see if they are all identical in size. Then check the air pressure. After that, I dont have a clue why it would have after changing tires.

The shuddering is caused by an out of balance wheel. It will occur over a certain speed like you say, just take it to a (good) tire place and get the front tyres rebalanced (say $20 - no more imo). A weight may have fallen off your new wheels or something to cause it...

Put your Pugs on and be done with it!

 

You could waste Pug money on fixing this problem...?

 

Re-check your tire size, tire pressure and do some rotation experiments.