What Size of Tires Do I Use

[Jacko3]

I know I will be changing my tires somewhere between 20k and 25K miles. My tires sizes are:

Front: 225/40/R19 89Y

Rear: 245/40/R19 94Y

Front Rim is 19 X8.0

Rear Rim is 19 X 8.5

These are stock numbers

I am probably going to buy the same tires but I want fatter tires of the same 19 inches that will fit the current rims I have using 5the same brand of tires. Can anyone give me an advice on this? Thanks!

[joe603]

I've done this....I highly recommend it!! The wider tires look much better than the stock sizes. Plus, there is less than a 5% difference in height, so your speedo and VSC are not affected. Do a search for more info...this was brought up not to long ago.

Here are the sizes that will work:

245/35 -19 front275/35 -19 rear

Check out these sites for more help:

http://www.bigcustomwheels.com/info_spe ... /index.cfm

[RED_DET]

+1.

search, there is another thread with optional tire sizes as well.

Joe, when you gonna sell me those wheels?

[Beancooker]

I found this to be the most helpful calculator when determining tire sizes...

Tire size calculator

[Sentientbydesign]

A 235/40/19 front would also work. It's ever so slightly closer in size to stock than the 245/35/19.

[joe603]

The first number is the width and the second number is related to the height...However, its not that straightforward...google it for a better answer (its confusing).

...and I LOVE my OEM wheels

[Jacko3]

Joe603:

Thanks for the info. Do you have the same rim size as I have listed above 19 X 8.0 (Front) and 19 X 8.5 (Rear)? And if you do, did you ijnstall the tire sizes you have suggested on those same rims? My rims are the same as yours in design.

Also i checked this tire place on line, which was extremely helpful. They are tirerack.com. They actually fit the car and the rims on a selected color of your car picture which is constantly changing. I was impressed with their technology.

[Sentientbydesign]

The first number is the width expressed in millimeters. Divide by 10 to get centimeters.

There are 2.54 centimeters/inch.

The second number is called the Aspect Ratio. It is the height expressed as a percentage of the width.

The last number is the Rim Diameter. Sometimes it is accompanied by a couple of letters like ZR19. The Z is the speed rating. The R means it's a Radial (tubeless).

Example: 225/40/WR19.

225 millimeters wide = 22.5 cm =8.86 inches wide

40 Aspect Ratio- 225 x 40%= 90 = 3.54 inch tall sidewall.

This tire is designed for a 19 inch rim and is W speed rated.

[joe603]

^ exactly...that's why I said it wasn't straightforward!

Jack,

Yes, I have the same rims as you...just the performance tire & wheel package.

Do a search...I posted pics of how they look on another thread.

[Daddygonz]

We are running 19x9.5 with 245/35/19 fronts and 19x10.5 with 275/35/19 Michelin Pilots on Volk Racing SF Challenge. Here are some shots