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