my01ws6

iTrader: (16)

Ok here are my questions....I had 275/40/17s on my stock WS6 Rims....now I bought 18" American Racing Rebels....I bought 275/35/18s all the way around for the rims....

Now what Im wondering is do I need an allignment after I put these on? anything? speedo recalibration? anything at all??

Blakbird24

iTrader: (24)

I did that exact same change in tires and it actually made my speedo more accurate. It was off by maybe 2mph, now it's dead on. Pure dumb luck i suppose. There is a slight reduction in overall diameter with those tires, so theoretically, it may throw off your speedo. I can't imagine you'll need any alignment changes due to those tire sizes.

JR HAWK 9

iTrader: (3)

no, that is the correct size tire for an 18" wheel that will be as close to the circumference of the stock sized tire. It will only be ~0.3% off, so when your speedo reads 60mph you will actually be going 59.8mph, in theory anyway.

no need for an alignment after a rim/tire swap. You are good to go, you don't need to do anything more but to enjoy your new rims/tires

my01ws6

iTrader: (16)

sweet thanks guys!!! I knew there so was kind of calculation I just dont know how to do it and I heard you have to be within 3% or something like that....