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post #1 of 14 (permalink) Old 11-21-2010, 05:38 PM Thread Starter
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Big tires!

Whats the biggest dia tire that can fit on a t-bird? Right now I have 235/60-15 which is ~26.1". Looking at some 215/70-15 which is ~26.9".

Thanks

1995 T-bird 4.6l - Eibach lowering springs, Cobra R hood, One 12" sub woofer, Alpine type-R front speakers. 16.249 @85.11mph 1/4 mile
2001 Pontiac Trans Am WS6 - Cam, headers, HPtuned by me.
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post #2 of 14 (permalink) Old 11-21-2010, 06:23 PM
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The green 1995 LX in my sig came to me last year on 215/70-15 B F Goodrich tires which was the stock size as far as I can tell, they were on it in that sig pic.

I now have 225/60-16s on sport wheels, just about same diameter. The speedo of my '95 is just about dead on accurate with either one.

235/60-15s were a bit shorter, I ran them on my old '85.

You could easily run 235/70-15 on the rear, likely even 245/70-15s but just keep inmind changes to speedometer accuracy.

http://www.1010tires.com/TireSizeCalculator.asp

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post #3 of 14 (permalink) Old 11-21-2010, 08:01 PM
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Quote:
Originally Posted by David_viny View Post
Looking at some 215/70-15 which is ~26.9".

Thanks
That's the stock size for the 96 Cougar, lol.

I run 225/60-15's on my cars; 225/60-16's on Lazarus, the Black Cougar.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #4 of 14 (permalink) Old 11-21-2010, 09:45 PM
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I have 225/65R16s on the Cougar now. The 225/70R16s were just a bit too tall.

RwP
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post #5 of 14 (permalink) Old 11-21-2010, 10:49 PM
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215/70-15 is stock.

I put 235/70-15s on the rear before, no issue, car did not have ABS.




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post #6 of 14 (permalink) Old 11-25-2010, 03:05 AM Thread Starter
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Quote:
Originally Posted by CrystalPistol View Post
...on 215/70-15 B F Goodrich tires which was the stock size as far as I can tell, they were on it in that sig pic.
Quote:
Originally Posted by Grog6 View Post
That's the stock size for the 96 Cougar, lol.
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Originally Posted by GreenBird View Post
215/70-15 is stock.

Doh! Probably should have looked at the sticker on the door or wherever it is. I always thought my 235/60-15's were taller then stock too lol. I need to get winter tires so I'm looking for the biggest I can fit diameter wise. Mainly concerned with the front rubbing when turning. Looks like the rear can take a pretty decent size bigger, but want to keep all 4 the same size.



Quote:
Originally Posted by RalphP View Post
I have 225/65R16s on the Cougar now. The 225/70R16s were just a bit too tall.

RwP
Did the 225/70R16's rub? How bad was it, and are you lowered?



Now thinking of either 205/75-15's or 225/70-15's. A little taller then stock, but shouldn't rub (hopefully lol). The 205's should cut through snow and slush real nice.

-Dave

1995 T-bird 4.6l - Eibach lowering springs, Cobra R hood, One 12" sub woofer, Alpine type-R front speakers. 16.249 @85.11mph 1/4 mile
2001 Pontiac Trans Am WS6 - Cam, headers, HPtuned by me.
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post #7 of 14 (permalink) Old 11-25-2010, 09:29 AM
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Originally Posted by David_viny View Post
Did the 225/70R16's rub? How bad was it, and are you lowered?
Well, if I stood them by the car, they were taller than the fender well, with the 225/65R16s on the car. Which don't clear by MUCH, but do clear.

The guy even offered to mount one and see how it fit. I thanked him but didn't. The current tires are about 5% low in speed ( i.e., at an indicated 70 MPH, I'm doing about 72 or 73). The best part is, I bought them not-new (hey, they had stipples on them still - couldn't been VERY used!) for $170 mounted and balanced.

The car has stock springs on a 20 or 21 year old car, I think it IS lowered some, but not by design

Hmm ... Have to clean the finger prints and brake dust off the wheels and post a pic. But they new Yokohama Avids ride MUCH better than the old ones. (Due to being broke and my nephew owning a wrecking yard, I had Sears Guardsman on the front and BFGs on the back. Don't ask me what series of either - they're gone now.)
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post #8 of 14 (permalink) Old 11-26-2010, 03:02 PM
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I can attest that a good snow tire in the stock 215-70-15 size works wonderfully in Minnesota snow.

People don't seem to factor wheel width in their tire size calculations. The 16" stock wheels are 7", while the 15" stock wheels are 6.5. That causes the overall diameter of the mounted tire to be virtually identical, where on paper and unmounted they're not. I don't understand why the tire size calculators don't factor wheel width in, but that's my understanding.
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post #9 of 14 (permalink) Old 11-29-2010, 12:17 AM Thread Starter
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Well, I ended up getting 205/75-15's. They don't rub, and I'm lowered 1.5". So far so good.


1995 T-bird 4.6l - Eibach lowering springs, Cobra R hood, One 12" sub woofer, Alpine type-R front speakers. 16.249 @85.11mph 1/4 mile
2001 Pontiac Trans Am WS6 - Cam, headers, HPtuned by me.
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post #10 of 14 (permalink) Old 11-29-2010, 12:47 AM
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David - That's about how my tires fill my wheel wells.

Looks good IMO - better than the "Hey, the springs have collapsed!" look some folks like.

I like the wheel wells filled, with the center of the wheel about concentric with the center of the well arc myself.

RwP
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post #11 of 14 (permalink) Old 11-29-2010, 12:50 AM
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i ran 275/60r15 on stock fan blades for 3 years without issue.
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post #12 of 14 (permalink) Old 11-29-2010, 06:13 AM
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Good Looin' car David!

Tell me about that Cobra R hood.

Where'd ya get it, how much was it, how long have you had it?

Could you post pictures of it with views from other angles?

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. Fusion® Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto

Last edited by Trunk Monkey; 11-29-2010 at 06:23 AM.
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post #13 of 14 (permalink) Old 12-02-2010, 04:30 AM Thread Starter
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Quote:
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Good Looin' car David!

Tell me about that Cobra R hood.

Where'd ya get it, how much was it, how long have you had it?

Could you post pictures of it with views from other angles?

Thanks! Sorry for the late reply, my work hrs blow.

I got it from here: http://www.fiberpartsconcepts.com/
There was a group buy a few years ago so I think I payed $400 or 450, cant remember. Fit and finish was pretty good. Its finished on the underside so you can use the regular hood latch and hood struts.

I've had it for probably 3 years, 2 of which it sat in the shed LOL. I painted it myself outside so its not perfect.










Almost forgot, this is a 96-97 hood with 96-97 headlights, corner lights, and header panel. Only difference is the cutout for the different headlight shape IIRC.

1995 T-bird 4.6l - Eibach lowering springs, Cobra R hood, One 12" sub woofer, Alpine type-R front speakers. 16.249 @85.11mph 1/4 mile
2001 Pontiac Trans Am WS6 - Cam, headers, HPtuned by me.
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post #14 of 14 (permalink) Old 12-02-2010, 06:31 AM
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Thanks for the reply and addl. pictures.

How's it look from inside the car? Could you post one more picture of the view from behind the wheel across the top of the dash?

Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. Fusion® Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto
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