After adjusting my ride height I've scheduled a 4-wheel alignment. Right now there are 17" rims with winter tires on there. In the summer when i put my 18" rims back on will i have to do another alignment? or is that only if i adjust the height again?

-Thanks

 

Only if you adjust the height again. The alignment is set off of solid points (i.e. the wheels) so in esscence all the hubs are aligned to specs. Changing tires or even rims for that matter won't affect your alignment if nothing else is changed in the suspension.

 

yup and both of your sets or rims have their own balance weights too that are centered around your wheel hub THAT is still aligned to begin with so you are definately fine.