[mashimarho]

So, I'm trying to figure out how to use the calculator.. I think I'm obviously using it wrong

So, I'm thinking about getting new wheels and I'm trying to figure out if it's okay to be within these 2 options of specs..

Using these wheel specs:
19x9.5 +22
19x11 +25

My original specs that always worked was:
235/35/19
265/30/19


OPTION #1
225/35/19
265/30/19

OPTIONS #2
235/35/19
255/30/19

Will either option #1 or #2 work to stay within the 1%?
I'll be using V12s.

Thanks in advanced.

[m_fife]

Originally Posted by mashimarho

So, I'm trying to figure out how to use the calculator.. I think I'm obviously using it wrong

So, I'm thinking about getting new wheels and I'm trying to figure out if it's okay to be within these 2 options of specs..

Using these wheel specs:
19x9.5 +22
19x11 +25

My original specs that always worked was:
235/35/19
265/30/19


OPTION #1
225/35/19
265/30/19

OPTIONS #2
235/35/19
255/30/19

Will either option #1 or #2 work to stay within the 1%?
I'll be using V12s.

Thanks in advanced.

Option 1: 0.23% - Good to Go
Option 2: 1.8% - No Go

And FYI, if you go to the wheels and tires forum, there is a calculator at the top of the page that will help you figure out future combinations.

[mashimarho]

Originally Posted by igotag

Option 1: 0.23% - Good to Go
Option 2: 1.8% - No Go

And FYI, if you go to the wheels and tires forum, there is a calculator at the top of the page that will help you figure out future combinations.

Got it. I think I tried it, and it gave me some weird negative #. Figured it was plug-n-play.
My other option is to give it some stretch and go 225/35/18 & 255/30/18

[JaysBlueE92]

same setup..i ended up with 225/35 and 255/30. I thought the hankooks discontinued 265/30?

[mashimarho]

Originally Posted by JaysBlueE92

same setup..i ended up with 225/35 and 255/30. I thought the hankooks discontinued 265/30?

I don't think so. They had it back ordered I thought. I've seen them around still.
I guess I'm going to go with the 225/35 255/30
Lot's of poke

[Jacblack]

For option 2 to work you need to bump the rears to a 275/30. That is what I'm running on my e92 xdrive because it was the closest ratio.

[N8N]

you can also look up revs per mile on Tire Rack's spec sheet

http://www.tirerack.com/tires/tires....entus+V12+evo2

if those are within 1% you're GTG, although obviously the closer the better.

[mashimarho]

Originally Posted by N8N

you can also look up revs per mile on Tire Rack's spec sheet

http://www.tirerack.com/tires/tires....entus+V12+evo2

if those are within 1% you're GTG, although obviously the closer the better.

Trying to calculate it.

[JC335xi]

Originally Posted by mashimarho

Trying to calculate it.

Using the revs per mile or actual diameter from tirerack will be a little more accurate because those numbers are based on the actual dimensions of the specific tire rather than the nominal dimensions for that size.

[gtaccord]

I would not recommend option 1 either. The front tire diameter needs to be equal to or larger than the diameter of the rears and then also within 1%. Stay away from smaller front tires.

[mashimarho]

Originally Posted by gtaccord

I would not recommend option 1 either. The front tire diameter needs to be equal to or larger than the diameter of the rears and then also within 1%. Stay away from smaller front tires.

You're the only one that didn't recommend optiopn #1. I don't know if everyone is doing the same math. Now I'm lost.

[JC335xi]

235/35/19 and 275/30/19 are basically the same diameter (only 0.077% difference).

[mashimarho]

Originally Posted by JC335xi

235/35/19 and 275/30/19 are basically the same diameter (only 0.077% difference).

Well, my goal is to get 255/35/19 tire. What do I need to run in the front? 225?

[T0NE*F32]

Originally Posted by mashimarho

Well, my goal is to get 255/35/19 tire. What do I need to run in the front? 225?

225/40/19 best option.

[Jacblack]

Originally Posted by JC335xi

235/35/19 and 275/30/19 are basically the same diameter (only 0.077% difference).

Hence why I run this sizing. Car feels great with them to even when launching it.

[mashimarho]

Originally Posted by T0NE*E60

225/40/19 best option.

For 19x9.5 +22?

[T0NE*F32]

Originally Posted by mashimarho

For 19x9.5 +22?

offsets dont matter when it comes to matching up tire diameter. What width are the rears? If its 10.5 or 11, your good to go. Tire stretching CAN affect diameter.
For example: 225/40/19 on 9.5 width VS 225/40/19 on 10,10.5, or 11 would not have same rolling diameter even though tires are same size.

[mashimarho]

Originally Posted by T0NE*E60

offsets dont matter when it comes to matching up tire diameter. What width are the rears? If its 10.5 or 11, your good to go. Tire stretching CAN affect diameter.
For example: 225/40/19 on 9.5 width VS 225/40/19 on 10,10.5, or 11 would not have same rolling diameter even though tires are same size.

Thanks. 11 rear.

[bmw325i]

Originally Posted by mashimarho

So, I'm trying to figure out how to use the calculator.. I think I'm obviously using it wrong

So, I'm thinking about getting new wheels and I'm trying to figure out if it's okay to be within these 2 options of specs..

Using these wheel specs:
19x9.5 +22
19x11 +25

My original specs that always worked was:
235/35/19
265/30/19


OPTION #1
225/35/19
265/30/19

OPTIONS #2
235/35/19
255/30/19

Will either option #1 or #2 work to stay within the 1%?
I'll be using V12s.

Thanks in advanced.

Option #1 will have the same amount of stretch in the front and rear and it is .23% difference.

http://www.willtheyfit.com/index.php...et2=25#content

[gtaccord]

Originally Posted by mashimarho

You're the only one that didn't recommend optiopn #1. I don't know if everyone is doing the same math. Now I'm lost.

If you search around on the all wheel drive forum there are several posts regarding people have problems with certain front to rear size combinations which general result in awd system error, drivability concerns (surging, grinding or binding) or, in the worst case, system damage.

While most problems were caused when the 1% rule was grossly ignored some were caused when the front diameter is less than the rear. Read my responses to one of the posts here.

http://www.e90post.com/forums/showthread.php?t=995827

If you want to go with the 255/30-19 rear then 225/35-19 is the correct front sizing. As others have said 235/35 F with 265 or 275/30 rear are also common and safe options.

[angel_rod]

So I got esm 004 19x9.5 et 40 I have 08 335xi sedan what tires should I go with so I don't have problems

[Jacblack]

If all four wheels are the same width then you can run the same size tire. Staggered tires on square wheels looks silly.