I just ordered tanabe nf210 springs and kyb gr2 struts for my 300 i was just wondering should i have an alignment done? and i took my 20" wheels off for the winter i have my factory 16"s on for now does it matter which wheels i have on when they do the alignment? thanks for your help pics would be apreciated with this setup

 

i shouldnt matter on witch tires you have on there. all in all your aftermarket wheels should be real close to the same O.D. as the stock. i allways have mine realigned with the stockies on.

 

20's i believe have an overall larger diameter than oem 16's. up to you, but wait about 1-2 weeks before getting alignment.

 

yeah you need time for the suspension to settle...

 

i needed to get mine done. i just went to firestone and got a lifetime warrenty on it. for 170!

 

Not always the case, stock 16s are about 25.7" and 17s are 25.3" to where the most common tire on a 20" is a 245/35/20 with a diameter of around 26.7"

An alignment should always be done after any suspension work. The car will only settle about a 1/16 to maybe 1/8. That is not enough to change camber after alignment. You should get an alignment asap to correct any changes in caster and toe, which are the major cause of uneven tire wear.

 

my rear settled bout 1/4" more than a week after install.
my mechanic is always eyeing my caster/toe to get as close to spec.

 

What he said.