tire size help. Wider in ther rear?

1992mustangLX · Nov 2, 2007

Hey guys, I recently picked up some 17x8 cobra r wheels for my mustang and was looking to ossibly stagger the tires sizes front to back. What size tire is good for the front with out any clearence or rubbing problems? Also Wanted to go wider in the rears and didnt know what i could do for a size on those. I was thinking 234/45/17 in the front and 255/40/17 in the rear. Im not to clear on the tire size and how they guege them but would the rears be wider or should i do the same size all around? Also I wanted to be sure these tires would actually fir on a 17x8in rim. thanks

87foxstang · Nov 2, 2007

i have 16x8 all the way around. I run a 225 tire up front and have zero rubbing even at full lock. I tried 245's in the front but had rubbing issues so i stepped down to 225's. I run 245's out back and i think the sidewall on them are perfect, of course you could run something wider in the rear. Hope this helps

BYRDPE · Nov 2, 2007

School me on tire sizes.
255's wider than 245's or is it vise versa ?
Is the lower the number the wider the tire?
Also what is the difference between a 234 and a 255?

soontobefastfox · Nov 2, 2007

?

BYRDPE said:
School me on tire sizes.
255's wider than 245's or is it vise versa ?
Is the lower the number the wider the tire?
Also what is the difference between a 234 and a 255?

Okay will the 255s are wider (255 mm) than the 234s (234 mm). That is the width of the tire.

A normal tire size width / sidewall / wheel size

for instance 275/35/17 means 275 mm wide, 35 mm sidewall, for a 17 inch wheel?

Is this clear?

backfocus · Nov 2, 2007

for instance 275/35/17 means 275 mm wide, 35 mm sidewall, for a 17 inch wheel?

Almost right!

Actually 35 refers to a percentage of the 275 to determine the sidewall aspect ratio.

Here is an example a little more detailed.

Section Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).

225mm / 25.4 = 8.86"

Sidewall Aspect Ratio

Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.

Shakerhood · Nov 3, 2007

One of the nicest combos I have seen on the Fox is:

245/45/17s Front
275/40/17s Rear

The nice thing about them is they have the same Diameters, you would never want to end up with a taller tire in Front.

bloopbloob · Nov 3, 2007

Shakerhood said:
One of the nicest combos I have seen on the Fox is:

245/45/17s Front
275/40/17s Rear

The nice thing about them is they have the same Diameters, you would never want to end up with a taller tire in Front.

thats what i'm running, no rubbing in the front, but i don't like how the sidewall doesn't come past the lip of the rim AT ALL, which is not very curb friendly. the rears look WAAAY better than the old 245/45/17's. they look bad ass! i get a little rubbing on the rear fender lips under hard cornering or big bumps, but nothing too bad

SuperStang83 · Nov 3, 2007

I've got 255s in the back and 245s up front and it looks great.

1992mustangLX · Nov 3, 2007

hey thanks for the replies, i failed to mention and i apologize. I have a lowering kit in the car so I assume that might make a difference in what size i can fit. I am just curious if it is worth it to stagger or should i just get all the same size? I personly think it looks beter when its a tad wider in ther rear.

soontobefastfox · Nov 3, 2007

backfocus said:
Almost right!

Actually 35 refers to a percentage of the 275 to determine the sidewall aspect ratio.

Here is an example a little more detailed.

Section Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).

225mm / 25.4 = 8.86"

Sidewall Aspect Ratio

Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.

Ah that makes more sense. Thanks for teaching me!

bloopbloob · Nov 3, 2007

1992mustangLX said:
hey thanks for the replies, i failed to mention and i apologize. I have a lowering kit in the car so I assume that might make a difference in what size i can fit. I am just curious if it is worth it to stagger or should i just get all the same size? I personly think it looks beter when its a tad wider in ther rear.

definitely looks better i think. i kind of wish i had 2 rim widths also, 8 in the front and 9 in the back to exaggerate it a bit more, and so i could have a bit more rubber past the rim lip on the fronts. I didnt think the 245 to 275 swap in the rear would look much different, but it really does.

tire size help. Wider in ther rear?

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