Tire Sizes??

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01-17-2011, 06:26 AM

#11

jdmcbride

4th Gear Member

Join Date: Jan 2007

Location: Palm Beach to South Carolina

Posts: 1,567

Quote:

Originally Posted by mkaishar2

I just bought these last week:

http://www.tirerack.com/tires/tires....omCompare1=yes

will be having them installed next week, same chrome 18" x 8.5 bullit wheels.

That's what I installed a couple of months ago. They fit the factory 18" wheels perfectly! Since the factory 18" wheels are 8.5" wide, the 255/45/18 is the recommended size for these wheels.

My new tires ride the same as stock, but with more traction!

01-17-2011, 11:15 AM

#12

808muscle

5th Gear Member

Join Date: Oct 2009

Location: Maui

Posts: 4,752

It'll look way better.

01-17-2011, 09:52 PM

#13

stanngg

2nd Gear Member

Thread Starter

Join Date: Sep 2006

Location: Blackwood, NJ

Posts: 300

Hey Jdmcbride,
are they your new tires in your sig? Have any pics of the new tires on the 18" wheels? I have the same 18" polished wheels...

Quote:

Originally Posted by jdmcbride

01-18-2011, 07:06 AM

#14

jdmcbride

4th Gear Member

Join Date: Jan 2007

Location: Palm Beach to South Carolina

Posts: 1,567

Quote:

Originally Posted by stanngg

Hey Jdmcbride,
are they your new tires in your sig? Have any pics of the new tires on the 18" wheels? I have the same 18" polished wheels...

Yes, the tires on the car in my sig are my new Goodyear Eagle F1 Supercar tires. The tire size is 255/45/18 and fit the factory polished bullit wheels perfectly - these are the tires that should have come on the car from the factory.

I always thought that the 235/50/18 size that came on the car looked a little narrow for the wheel. But I am thankful that Ford made these wheels 8.5" wide(as I prefer the look of the polished bullits).

I will try to take some close up pics of the sidewall and post them here.

04-02-2011, 04:34 PM

#15

stanngg

2nd Gear Member

Thread Starter

Join Date: Sep 2006

Location: Blackwood, NJ

Posts: 300

So I went with the Yokohamas 255/45/18. They look so much better then the stock tires. They actually have a little thickness too them....and the ride is great. Thanks guys for the good advice.

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04-02-2011, 04:54 PM

#16

Alec

5th Gear Member

Join Date: Aug 2009

Location: Philadelphia, PA

Posts: 4,256

I just bought a pair of Nitto NT555 255/45/18s for the back and I can't wait to get them on. I just wish I could have gone bigger on my current rims though. I'll report my finding once they're on.

04-02-2011, 11:46 PM

#17

olvanish

3rd Gear Member

Join Date: Jul 2007

Location:

Posts: 929

Quote:

Originally Posted by Nuke

That's actually a pretty good match. Your speedometer will be off by 0.4 MPH higher than it is now, assuming the tire specs are the same from brand to brand. Use this: http://www.1010tires.com/tiresizecalculator.asp

More importantly, what is the width of the wheels are on your car? Most tire manufacturers recommend 8.5" min for 255's, if I recall. An 8" width can take a 245/.

Given 763.3 RPM for 235 and 769.5 RPM for 255 how did you come up with 0.4MPH knowing that the percentage in rev difference is approximately 1 percent and at what specific speed would that 0.4 would apply exactly? Wouldn't that difference be variable depending on speed or is it still 0.4 MPH even when vehicle is moving at 0.1 MPH which means the reading would be 5 times higher ((0.1+0.4)/0.1=5)? lol Sorry I'm getting rhetorical here. What nuke was trying to say is that when you hit 100 it will read 101 and at city speeds your reading will be off about 0.4 MPH, and as far as ride comfort you won't feel a thing.

Last edited by olvanish; 04-02-2011 at 11:49 PM.