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1994 deville
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51 Posts
Discussion Starter #1
hi what is the tallest tire I can use on my 15" car I see 225 70 15 but would a 225 75 15 be bigger anybody used 235?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,256 Posts
hi what is the tallest tire I can use on my 15" car I see 225 70 15 but would a 225 75 15 be bigger anybody used 235?
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what are you actually trying to do?

the correct - stock size tire is 215/70/15 -

it has a 26.85" diameter -
and 215mm wide section width -

a 235/75/15 -
is a full 2" taller - 28.88 diameter -
and 3/4" wider -

might not rub sitting - or going straight -
probably will rub turning - or going over bumps -

not to mention the speedo will read low -
 

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1995 SEDAN DEVILLE-4.9 & 1978 SEDAN DEVILLE-425
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1,673 Posts
hi what is the tallest tire I can use on my 15" car I see 225 70 15 but would a 225 75 15 be bigger anybody used 235?
Recently put new 215/70/15`s on my `95 Deville.
I wanted to go to 225`s but the extra inch would rub on bottom of front strut assembly.
It`s real tight fit in the wheel well and best to keep stock size, unless want to spend much $$$ making modifications.
I prefer keeping it all stock sizes.
 

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Registered
1994 deville
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51 Posts
Discussion Starter #5
hi I would like to go a little taller it shows that 225/70/15 were an opt for that car ......so would a 215/75/15 be taller? my bro just got 40 acres up north my car can do the dirt roads but wanted to be taller as its right there wanting to hit stuff .. I miss the 235s like my roadmaster had ....
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
The first number is the width in mm. The second number is the aspect ratio. It's the sidewall but represented in a percentage of the width. For example (and with simple numbers) a 200/50 would have a 100mm tall sidewall. A 200/75 would have a 150mm tall sidewall. Any tire size option listed on the door plaque have the same outside diameter.

Ideally, you want to keep the tire outside diameter within about 1/4" of the original. More than that and you get speedometer/odometer errors. Too far off and you can start to rub.

You're not going to gain any more ability to smoothly traverse a dirt road by increasing sidewall height by less than an inch.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,256 Posts
hi I would like to go a little taller it shows that 225/70/15 were an opt for that car ......so would a 215/75/15 be taller? my bro just got 40 acres up north my car can do the dirt roads but wanted to be taller as its right there wanting to hit stuff .. I miss the 235s like my roadmaster had ....
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my bro just got 40 acres up north my car can do the dirt roads
but wanted to be taller as its right there wanting to hit stuff
so - you gonna take the 'ol hooptie-lac off-roadin? YEE-HAW -

iffun yer gonna do it - ya gots ta do it rite -

git yerself a cuple 2by2z - and jus hammer em inta da sprangs -
inbetwixt dem coilz -

dat otta lif da car up a cupola inchez
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it shows that 225/70/15 were an opt for that car ......
so would a 215/75/15 be taller?


a quick tire lesson -
on a 225/70/15 tire -

225 is the section width - measured in mm -
the fattest part of the sidewall -
when mounted and inflated -

70 is the aspect ratio -
a percentage of sidewall height -
compared to tire width -

15 is the wheel diameter -

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so - a 225/75/15 will be taller than a 225/70/15 -


stock size 215/70/15 has a diameter of 26.85"
a 215/75/15 has a diameter of 27.7" -
a 225/70/15 has a diameter of 27.40" -
a 225/75/15 has a diameter of 28.29" -

so - comparing the stock size 215/70/15 - to a 225/75/15 -

there is a 1.44" difference in diameter -
that means you would gain about 3/4" additional ground clearance -

oh - and iffun ya putz da 235/75/15 on -
yude git a inch o xtra clearance cuz itz to inchez hier den de orijenal tirz -
 

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1994 deville
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51 Posts
Discussion Starter #8
should of got a suv but a 42000 mile garaged kept az car for $3500 was too hard to pass up.......
 

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1994 deville
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51 Posts
Discussion Starter #9
also its not like im rock climbing .just a dirt road some ruts .. I was just asking a ? its halls moonshine better than a truck lol
 
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