225/45/18 tires... whats the deal..??

[Peyman]

How come no one ever gets 225/45/18 tires.... i heard from someone that the 45 sidewall is not good for some reason...is this some kind of bullshit?... lol.... some guy is selling 4 Michelin Pilot Sport 225/45/ZR 18 with 300 miles on them, i made a deal with him for $300, good deal huh?....yeh so whats the deal with the 225/45/18...everyone always seems to have the 225/40/18

[Colin]

Originally posted by Peyman
so whats the deal with the 225/45/18...everyone always seems to have the 225/40/18 Because 225/40/18s are 25.09 in diameter ( very close to stock ) , and 225/45/18 are 25.97 in diameter which will put your speedo off and effect your final drive ratio . And they might rub on a lowered car ..

[nice96gt]

225/40/18 are a better replacement for your stock size. Your spedometer would be reading 4.4% too slow if you went with a 45 series tire. A 40 series tire is more acurate even though it's still off a little...check here Pey

http://www.miata.net/garage/tirecalc.html


EDIT...yeah...what Colin said :)

[BledRedGaSe]

Yup Ur speedo will be off.