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Unread 06-28-2010   #1 (permalink)
Rob 21 is offline Apprentice

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Default 98 mustang 18" rims need biggest tire size

I just got 18"rims off my brother. They fit my 1998 mustang gt but they need new tires. The rim is 8.5" wide by 18"tall. The tires that were on it were 225/40/18. and they are in bad shape. I dont like how low profile they are on my car, i was wondering what the biggest tire size i would be able to get with out rubbing is? I like the 245/45/18. Is there much of a difference between the 40 and 45 profile?
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Unread 06-29-2010   #2 (permalink)
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You don't want 225/40-18 (I think it's a typo):
40% x 225 = 90mm = 3.5" sidewall --> 25.1" OD (stock is 25.7")

There's a significant difference between 245/40-18 and 245/45-18:
40% x 245 = 98mm = 3.9" sidewall --> 25.7" OD
45% x 245 = 110.3mm = 4.3" sidewall --> 26.7" OD
When you compare these to your stock size of 225/55-16:
55% x 225 = 4.9" sidewall --> 25.7" OD
you can see why 245/40-18 is highly recommended...

But you want larger profile, so I would suggest going wider with the tire, which would increase the OD in smaller increments than just bumping aspect ratio (A/R). You saw above how going from 40 to 45 A/R increased the OD by a full inch!! That's too much and your tires would probably rub. On the other hand, going from a 245 to 255 wide with the same 40 A/R increases the OD to only 26", and a 265 section width yields an OD of 26.3"... So those sizes (255/40-18 or 265/40-18) might be better options for you.

My $.02: I don't suggest messing with the OD of your tires. You are screwing up your suspension and you have to worry about tire-rubbing. I highly recommend staying with the stock OD and using tires that make that happen. This is the sacrifice that goes with large rims -- low-profile tires and worse ride quality. But you gain leaps and bounds in the appearance department, IMO. I have had 18" rims (with 25.7" OD fitted tires) on my 98 for about a year -- and I love them and don't care that the ride is a little harder. I'm just more careful of potholes.
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FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver
POWER: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage)
STYLE: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs
RIMS: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear
TIRES: BFG KDW/2 245/40R18 front, 275/35R18 rear
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Unread 06-29-2010   #3 (permalink)
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Here's a tire calculator that might be useful to you: Tire size calculator
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Unread 07-06-2010   #4 (permalink)
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Thanks for the input. I will let you know what tires i come up with. you were a big help THANKS
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Unread 07-29-2010   #5 (permalink)
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265/40-18 should fit nicely.
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