McNord

iTrader: (1)

I am trying to figure a few things out. Right now I have a 17" wheel with a 40 series tire, if I go to an 18" wheel with a 40 series tire I will increse my ride height by 1/2". If I go with an 18" wheel and a 35 series tire my ride height will stay the same as it is now with the 17" wheel and 40 series tire.

Am I thinking about this correctly? I know ride height isn't the way to measure, I am just using it as a base to start from, thats how my febel mind works sometimes lol.

Thanks

ChevyChad

iTrader: (50)

The series # is a percentage of the width of the tire. So you can't really say that straight across the board that a 35 series will be equivalent to a 40 series on a 1" smaller diameter wheel..

For example, a 275/40/17 total height is 25.661" (275 x .40 = a sidewall of 110mm or 4.33", so top sidewall of 4.33" + 17" wheel diameter + 4.33" bottom sidewall)

A 275/35/18 is 25.579" so, at that width, that holds true.

However, a 315/40/17 is 26.921 vs a 315/35/18 is 26.681, so as you can see, the wider the tire, the more the difference is gonna be.

'Trust'

iTrader: (24)

However, a 315/35/17 (which would be 25.68" tall over all) is the right tire for a 17x11ish wheel for our cars, only a few people make a 315/35/18 (MT being one and it would be 25.44" tall) so most go with a 305/30/18, which is 25.2" tall .

Also, are you going to the midnights this weekend?!

JeaneZ28

iTrader: (3)

What about the 305/35/18 ?

Overall Height 315/35/18 = 26.68

'Trust'

iTrader: (24)

26.4" tall. Is that the more popular one? I always get that and a 305/30 mixed up.

Xsta Z 28

iTrader: (2)

Yes you are correct. There is a tire calculator in the stickies.

McNord

iTrader: (1)

Thanks guys, I didn't know all that This is so confusing.... I can tear down & rebuild the motor but I can't pick a set of tires. Will I be ok with a falken 275/40/18 on the rear? Car is lowered with hotchkis springs.

McNord

iTrader: (1)

I was trying to figure it out but I am like Forrest Gump when it comes to this stuff.

JeaneZ28

iTrader: (3)

It will be fine with that setup.

'Trust'

iTrader: (24)

Yep, that tire will be fine, how wide are the wheels?

McNord

iTrader: (1)

9" wide

'Trust'

iTrader: (24)

Then yep, those are perfect.

ChevyChad

iTrader: (50)

I was just using arbitrary numbers as examples I dunno if I'm goin to the midnights or not man. Tyra isnt running right now. Well, she is, but I'm sure her clutch is covered in oil from that leak I had, so I'm not drivin it right now... Are you going? If so, I may come out just to watch you run so perhaps I can do a little bit of vicarious racing

'Trust'

iTrader: (24)

Yea, I'm going, then we have a 550WHP VR4, 550RWHP C6, 550WHP Evo, 650WHP Integra, 780RWHP 240 etc. going too. NOt sure if they are running the mid nights, but they are running Import Face Off Sunday. Not too many of our domestic guys coming out I guess, lol.

ChevyChad

iTrader: (50)

Dang, sounds like fun.. What days are you gonna be there? I may have to go check it out.

PS sorry for the

McNord

iTrader: (1)

No worries, I got the info I needed I think.... for now anyway.
Thanks all!