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post #1 of 16 (permalink) Old 07-09-2012, 03:39 AM Thread Starter
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Diameters?

What's the tallest overall mounted diameter anyone is running? Measuring it up, looks like 29" should fit, maybe even 30"?
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post #2 of 16 (permalink) Old 07-09-2012, 06:17 AM
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May I ask why you are wanting a taller tire?

Most people get a shorter tire, and lower the car. But I know we cant all lower our rides and your purpose could be totally different.

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post #3 of 16 (permalink) Old 07-09-2012, 07:40 AM
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Quote:
Originally Posted by Ahapp88 View Post
What's the tallest overall mounted diameter anyone is running? Measuring it up, looks like 29" should fit, maybe even 30"?
Is this a circuitous way of asking if you can put 20" or 22" rims on the car?

A 20" rim with a 245 /45 tire would measure 28.7" tall.
A 22" rim with a 245 /45 tire would measure 30.7" tall.

The largest any of us typically run is an 18" rim or 26.7" in diameter. Any more than that and your looking at having to recalibrate/correct the speedometer readings with a speed cal.

Read this thread for more information.

You can also use this tire size calculator to run the numbers.

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post #4 of 16 (permalink) Old 07-09-2012, 07:52 AM
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Drag Slicks..








Rayo..

.
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post #5 of 16 (permalink) Old 07-09-2012, 08:55 AM Thread Starter
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Drag Slicks..








Rayo..
Yes indeed, mounting drag slicks is why I ask. I'll be staying with a 15" wheel, and no concern about speedo accuracy, as it is currently being boxed up and sent on its way to another member. Will likely use a 4.56 or maybe even 4.88 gear, no street driving for this one.
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post #6 of 16 (permalink) Old 07-09-2012, 11:42 AM
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28's & 29 will fit under it if it is not lowered. Of course offset and wheel width also contribute to that.
For example I typically run 28 X 9.00 X 15's or 28 X 10.50 15's under mine.

I'm planning to go to a 29.0 X 10.50 later.

Steve
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post #7 of 16 (permalink) Old 07-09-2012, 01:20 PM Thread Starter
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Quote:
Originally Posted by 1MTNCAT View Post
28's & 29 will fit under it if it is not lowered. Of course offset and wheel width also contribute to that.
For example I typically run 28 X 9.00 X 15's or 28 X 10.50 15's under mine.

I'm planning to go to a 29.0 X 10.50 later.
You on an 8" wheel? Mine are 7" for now, they came on the car and I don't want to spend the $$ on wheels just now. Thanks for the good info,and also over on my "connectors or cage" thread.
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post #8 of 16 (permalink) Old 07-09-2012, 01:52 PM
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Originally Posted by Ahapp88 View Post
You on an 8" wheel? Mine are 7" for now, they came on the car and I don't want to spend the $$ on wheels just now. Thanks for the good info,and also over on my "connectors or cage" thread.
I run both the 28 tires on stock Bird 15" rims. The 10.50s are a little much but the 9" (28 X 9.0) work pretty well on there. Thats what I'd use. If you are running motor only stick with 26's for diameter or maybe even 27's with the lower rear gears. I have changed bolt pattern and will be going with different wheels for my 10.50's and the taller 29's.

Steve
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post #9 of 16 (permalink) Old 07-09-2012, 03:59 PM
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Running 275/60-15 MT radials.
Plenty of room.
They are on 15x8 weld drag lite 60,s.Mustang offset.

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post #10 of 16 (permalink) Old 07-09-2012, 08:51 PM
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Originally Posted by r429460 View Post
Running 275/60-15 MT radials.
Plenty of room.
They are on 15x8 weld drag lite 60,s.Mustang offset.
I used to run those (275-60-15 BFG Drags) on mine, stock rims on the street during the summer. They are a little tight on the stock rims but I expect they work well on the 8" wheels.

Normally on the street I run 255-60-15's on the factory cougar rims.

Steve
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Nitrous 11.75 @ 114 MPH

2008 Ford Powerstroke 6.4 TT F250 4X4 Supercrew: 12.82 @ 105 MPH

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post #11 of 16 (permalink) Old 07-14-2012, 03:32 PM
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I run a pair of 28x11.50-16 ET Streets (bias ply) at the track, and 275/50R17 (27.8" diameter) Nitto NT450's on the street. I'm lowered 1" with the original Vogtland springs, and there are no clearance issues.

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post #12 of 16 (permalink) Old 07-15-2012, 09:39 AM
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Quote:
Originally Posted by racecougar View Post
I run a pair of 28x11.50-16 ET Streets (bias ply) at the track, and 275/50R17 (27.8" diameter) Nitto NT450's on the street. I'm lowered 1" with the original Vogtland springs, and there are no clearance issues.


I was thinking the 275-50-17's were around stock height and diameter 26.6-26.8. Great for street tires. The others are actually 28" drag tires. They should work well.

Steve
1996 Cougar XR7 Special Edition (Street & Strip)
"There's a bad, built NA 4.6L COMING Spring-Summer 2018"

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Cougar ET-Stock 4.6 shortblock/Stock PI headswap Bullitt NA 12.94 @ 105+
Nitrous 11.75 @ 114 MPH

2008 Ford Powerstroke 6.4 TT F250 4X4 Supercrew: 12.82 @ 105 MPH

"IN MEMORY OF MY FRIENDS JOEL BENDER 1979-2006", JOHNNY LANGTON 1975-2011, and MICHAEL VIVERETTE 1953-2013"
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post #13 of 16 (permalink) Old 07-15-2012, 12:26 PM
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Quote:
Originally Posted by 1MTNCAT View Post
I was thinking the 275-50-17's were around stock height and diameter 26.6-26.8. Great for street tires. The others are actually 28" drag tires. They should work well.
Nope. 275/50R17's are just under 28" in diameter. They are noticeably taller than stock. Are you thinking of 275/50R15's?

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post #14 of 16 (permalink) Old 07-15-2012, 12:49 PM
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Rod

My Bad LOL! I was looking at one thing and thinking something else.

I know the 28's will generally clear under the cars even with an inch drop in the proper offset with wheels and tires although some will actually rub the outboard sidewall with passengers in the rear. On mine with the bags and Mark lower arms, stock springs and spring perches I can probably get 30's under it ok if I needed to.

Thanks for correcting me on the tire size.

Steve
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"There's a bad, built NA 4.6L COMING Spring-Summer 2018"

Elite member of the Halfshaft snapping, Auburn eating, Tranny crunching, Piston Melting, Tire lifting, 500+ lb ft Torque Club.

Cougar ET-Stock 4.6 shortblock/Stock PI headswap Bullitt NA 12.94 @ 105+
Nitrous 11.75 @ 114 MPH

2008 Ford Powerstroke 6.4 TT F250 4X4 Supercrew: 12.82 @ 105 MPH

"IN MEMORY OF MY FRIENDS JOEL BENDER 1979-2006", JOHNNY LANGTON 1975-2011, and MICHAEL VIVERETTE 1953-2013"
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post #15 of 16 (permalink) Old 07-19-2012, 05:18 PM
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No worries, Steve.

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post #16 of 16 (permalink) Old 07-21-2012, 12:05 AM
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275-40ZR-20 in back , corners good at 40-70 MPH an no rubbing yet .

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