15 or 20mm spacers question
 

ok so i tried to eyeball witha ruler about how much room i had for spacers. i am torn between getting 15 or 20mm on the rear after my swift spring install. my tires are 275/35/19 and taper in towards the top on my tsw's. my only problem is, i dont know where to measer on the tire to see what size spacer i will need. basically, depending on where i place the ruler i can fit anywhere from 10 to 20mm but i just dont know how to be sure.

anyone that has a surefire way to measure for spacers PLEASE let me know. i dont want to get 15mm and wish i had put 20mm on. At the same time i dont wanna rub ever time my springs compress hard.

Pic of the car as it sits currently on the swifts.


http://www.the370z.com/members/edub3...ed-spacers.jpg


Is there a precise science to this or is it a guessing/estimating game?

I read 15 on front and 20 on back with swift but again that is just some opinions. Who installed the swifts? Camber?

i installed them actually. wasnt too bad once you kinda figure out what all what needs to come off. rears were a breeze. could prolly knock them both out in 30 min with an extra set of hands around.

Camber is very close to factory specs. guy who did the alignment said that the tire wear difference would be minimal. I know a lot of people seem to be goinG 20mm out back and 15 up front, but i also see thats mostly with factory wheels, thats whats making me unsure...

How to Measure for Spacers - YouTube

from H&R so maybe that will help you

first off, wat is your wheel's offset?

i BELIEVE the offset is 27mm. i say believe because i didnt buy them. but from everything i've seen online it points to these being a 27mm offset. IF this were the case, do you know what spacers i can safely shove under there?

stock sports are +30 correct?

(NINJA EDIT)
on a side note it appears that my 19X9.5 are only offered in a 41mm offset. thoughts on front and rear spacers choices with these offsets?