As far as alignment goes, when I bought the tires the company that sold and mounted them also did an alignement... so supposedly my alignement is now "better".

As far as air pressure goes, the 14" was at 30/29 psi and now the 15" is at 33/32 psi.

Nothing else has changed. Driving conditions the same, everything.

This is really wierd. (and unnecessarily expensive)