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91 Brougham, 91 Hearse, 73 Fleetwood Brougham, 05 Town Car
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229 Posts
Discussion Starter #1
Would 215 75r15 tires be too small for my hearse? I found thick whitewalls and want to put them on my car. the fronts would be the 215 75r15, the backs would be 235's.

Any suggestions or problems?
 

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1979 Sedan deVille d'Elegance
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4,153 Posts
There is a whole thread on whitewall tires in the "sticky" section at the top of the threads in our RWD forum that you can refer to. Your hearse was probably intended to run with 225/75-15 front and rear. I had a 78 Fleetwood Limousine which had 235/75-15's on it when I purchased it and on curves the tires would rub. I replaced them with 235/70-15 tires and it was fine. :)
 

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94 Fleetwood Brougham
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7,534 Posts
Probably too small.

Look at the tires, see what the weight rating is on them, figure out the gross vehicle weight of the car and see how close it is.

Now, note the weight is @ a tire pressure. IF you use the tire pressure that Cadillac specifies, the tires are not going to safely support the weight that the sidewall specifies.

So if you want the soft ride, you need to add tire size to compensate for the less pressure Cadillac specifies.

I would recommend on a limo personally, no LESS than 235 70's.
 

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1989 Brougham d'Elegance, 1985 Fleetwood Brougham *Coupe*
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4,256 Posts
I wouldn’t recommend them. But you can use them. If these are the ones you’re are talking about, then they are rated at 1,742lbs. You would have to get your car’s exact weight (professional cars are heavier than regular production) but a standard Brougham only has 1,361lbs on each wheel.

You also have to consider the effects they are going to have on your handling. A smaller section width means less tread on the road, means less grip. Because your front wheels do the majority of braking, you may experience longer than normal stopping distances. There may also be problems with under steer as the tires cannot grip the road in turns.
 

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77 CDV, 06 DTS III, 69 FWB
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10,022 Posts
215 is too skinny. Not only does handling, braking, and traction suffer, they look really weak. 225 is the minimum for these cars.
 

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94 Fleetwood Brougham
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I never liked the look when Cadillac started putting the skinny tires on the 77-up cars (my mom's 85 FWB had them, yuk). I agree, it hurts far more than it helps. I tried some skinny 235 85 16's on my 454 Burb vs the 245 75 16's and even my current 265 75 16's. I'll take the 265s anyday.... There was no benefit in mpg and it looked funny from behind.

215 is too skinny. Not only does handling, braking, and traction suffer, they look really weak. 225 is the minimum for these cars.
 

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1989 Brougham d'Elegance, 1985 Fleetwood Brougham *Coupe*
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4,256 Posts
I just remembered... For the fist two winters I had my car, I used 215/70R15 studded snow tires, inherited from grandma's Lincoln... It was the best I could do considering the Cadillac emptied the coffers, and the dry rotting Michelins, which came with the car, could barely handle wet grass. I gave them to a friend who had a '90 Coupe de Ville, but that was because I upgraded, and not because of problems with that tire size and the car.
 

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1979 Sedan deVille d'Elegance
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Craig, I've used 215/75-15 on my cars, which is equivalent to the original tire size, and they're just fine - fast or slow. I think they look natural on the 77-79 cars. :)
 

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1979 Sedan deVille d'Elegance
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to answer the question of this thread, 215/75-15 tires are not appropriate for the hearse which should use 225/75-16, with XL preferably. :)
 

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91 Brougham, 91 Hearse, 73 Fleetwood Brougham, 05 Town Car
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229 Posts
Discussion Starter #11
Well I wasn't looking to keep stock size, just wondered since the car was heavier than a normal brougham if it would be a problem?
 

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1974 Cadillac Hearse 472
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496 Posts
wow I have Riken Raptor 255 45 ZR18 99w on the front and same thing but BF goodrich G-force 99Y on the rear.

What is the difference between 99w and 99y? The rears are bowed out a bit even at 36 PSI for my hearse.
 

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1989 Brougham d'Elegance, 1985 Fleetwood Brougham *Coupe*
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4,256 Posts
99=load rating=1709lbs
Y=speed rating=186mph
W="_-_-_-_-_"=168mph
 

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1989 Brougham d'Elegance, 1985 Fleetwood Brougham *Coupe*
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4,256 Posts
^That's why their bulging. 1709 is the weight for each tire, for each axle. 6839/4 = 1709. 7987/4 = 1996, so your 287lbs over weight. Lose the body...
 
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