Tire size for "16 Pony wheels on '87-'90 Mustangs

92LX5spd

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Feb 23, 2013
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From what I gather, Ford made changes to the wheel well/fender opening on later '91-'93 Foxes to accommodate the 16" Pony rims and their 225/55/16 tires. I've seen this cause rubbing issues if this combo is used on earlier '87-'90 GTs in the front. Switching to the slightly shorter 225/50/16s alleviates this. My question is, is this a specific early GT-only problem? Can the normal 225/55/16 tires be used on the '87-'90 LXs or, do they too, need the shorter 225/50/16 tires as well? This is for stock ride-height cars. Thanks for any insight.
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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I ran the pony wheels with the stock 225/55/15 on my ‘88 LX without issues. No rub even slightly lowered.

I later ran 245/50/16/ with only minor rub which was solved by installing the 91-93 rack limiters. The rub was on the inner fender liners at full lockZ

The difference in the fenders is ahead of the front wheels.
C916BB3E-B03E-4E82-A987-815D77602DBE.jpeg
 
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92LX5spd

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Feb 23, 2013
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I've read of others being able to trim and somewhat reshape the front of the smaller '87-'90 fenders to fit the newer '91-'93 extensions. The extensions supposedly hide any ugliness from trimming the fender.
 

Gs1987GT

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Sep 25, 2019
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I bought a set of chrome 16" pony stars/cooper tire combo for my 87 last year from lmr but haven't installed them yet, but will be in the near future, this fall so I'll report any interference concerns then..
 

Blown88GT

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Nov 13, 1999
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This is where mine rubbed with OEM wheels & tires, 225-60x15.
The OEM wheels are now spares with 225-50x15.
For 16" wheels, I changed to 245-45x16. When that size was no longer available, I used 225-50x16.
I now have 17" wheels with 245-40x17.

Use this tire sizing calculator.
 

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Bree

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Jan 12, 2021
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I try to keep Indian Outlaw as stock as I can. That said I'm running 225/55R16
Now, as mentioned above, I do get a tiny lit bit of rub, hardly worth mentioning on the fender extensions, but that's only because I have the old/longer extensions. Had my donor car been a 90+ instead of an 87, everything would be groovy. So, if you're trying to put pony wheels on something made before pony wheels came out, you may want to swap fenders to, or be prepared to make cuts.
Wait, I feel like a muddied the water.... Outlaw is actually a 91 LX which should take the short extentions. But, some uninsured a-hole turned left in front of me, and the only donor car I could find in my price range was an 87GT - long extensions. to make the nose swap look right, I had to use the 87's extensions because the GT extenstion has the fake air duct which continues into the rest of the nose, and the LX one is round and smooth. Also, one of mine was broken in the crash.
 

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jz88vert

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Jun 12, 2022
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From what I gather, Ford made changes to the wheel well/fender opening on later '91-'93 Foxes to accommodate the 16" Pony rims and their 225/55/16 tires. I've seen this cause rubbing issues if this combo is used on earlier '87-'90 GTs in the front. Switching to the slightly shorter 225/50/16s alleviates this. My question is, is this a specific early GT-only problem? Can the normal 225/55/16 tires be used on the '87-'90 LXs or, do they too, need the shorter 225/50/16 tires as well? This is for stock ride-height cars. Thanks for any insight.
Im waiting to order lmr chrome17"pony kit and contacted them about concerns for rubbing they said they would fit and front may rub at full turn to get turn spacers for race and pinion. I have 88 gt vert and lmr kit was 17x8 in front and 17x9 in rear wit 245/45/17 in front and 275/40/17 in rear they assured me they'd fit. I did read something about 91-93 having larger fender openings though