[9550gtsblack]

ok i was look at the wheels on my 95 gts yesterday and noticed that ive got 225/45 zr17s and 245/40/zr17s witch should i put on the rear? i got out the tape and the 225s are taller in side wall hight buy a 1/2 inch. didnt do the tread though so wich is better on back 225s or 245s?

[Ash5.0]

Stock size is 245/45-17" on 16" wheel is 225/55

[Gary Paul]

First number (225 or 245 etc.) is tread width in millimeters.
Second number (45 or 40 etc.) is the aspect ratio, or the sidewall height as a percentage of the tread width. The higher the aspect ratio, the taller the sidewall (when compared for the same tread width).
Final number (17 or 18 etc.) is the wheel rim diameter required.

245 tread width (about 9-5/8") is wider than 225 (about 8-7/8"), so choosing between those two widths the 245s should go on the rear.

[1989gtfifty]

the wider ones go on the back narrow on the front

[dakine858]

Originally Posted by 9550gtsblack

ok i was look at the wheels on my 95 gts yesterday and noticed that ive got 225/45 zr17s and 245/40/zr17s witch should i put on the rear? i got out the tape and the 225s are taller in side wall hight buy a 1/2 inch. didnt do the tread though so wich is better on back 225s or 245s?

245's on the rear, they are wider. The three-digit numeric portion identifies the tire's "Section Width" (the distance from the beginning of the outer sidewall to the inner sidewall) in millimeters. 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 (the length of the sidewall). The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. A letter that identifies the tire's internal construction follows the two digits used to identify the aspect ratio. If you have high performance tires they might have a speed rating represented by a letter that would come before the "aspect ratio", like Z rated tires (high speed).

[charliesolhan]

275/35/17..on back...and 245/40/17 on front.

[9550gtsblack]

thanks guys realy helped out a lot now maybe i can get a good lanch off the line so 45s on rear and 25s on front will switch them around today . the guy i bought the gts from was a bit of a fool and had 225s on the passinger side and the 245s on the drivers side. when driving hit bump and would go all over the road so took it tire shop and the put the 245s on front and 225s on rear. so i have to switch them around cool thanks again people u guys have been a very big help to my mustang and i. the info from this site is priceless yall are great thanks