Check inside your drivers door for the correct size tire for
the vehicle, if your tag is not on there, check in your owners manual.
IF you don't have one, call any tire store and they usually tell you by
looking it up on thier computer, i.e., Sears, Roebuck. But of course
you have to be slick and say that you may be thinking of buying new
tires, ya da ya da, can I go with a bigger tire.....
Yes there are references on the web, but the thing you care about is the
height of the tire. Change height and you throw off your speedometer.
Stand the 75's up next to the 70's. How do they compare in height? If they
are the same height, then put them on.
You should not have any problem with the 225/75-15s fitting the
wheel well, but you WILL have a speedo issue. Those 225s will make
your speedo and odometer run about 15% slow. It will also throw off
transmission shift points and converter lockup.
No good way to fix it either, since that size tire is not on the
factory list of tire sizes for that car, thus the ECM does not have a
calibration to correct the difference in frequency coming from the VSS
in the transaxle. The VSS in the 4T60E is not gear driven but is a
magnetic sensor triggered by a cogged reluctor ring mounted on the
differential carrier in the transaxle.
To answer your question the rest of the way--reference-chart part has
been answered already. To know for sure, install the front 2. Drive in an
uncrowded parking lot, and turn extremely to left; then drive and turn to
extremely right. Drive over a speed bump. If no interference, chances are
good they will run physically ok. According to the nice link provided by
jrl, you can just add about 8% to speedo reading to get true speed. ***A
rule of thumb I've used over the years is to not exceed factory spec'ns over
1 inch on the front, esp. on fwd. This would frown on your application, as
yours would increase by 2 inches.(Personally, I would not do it.) But, what
are you willing to put up with???*** HTH & good luck, s
This is a tough decision. I wouldn't mind going up
or down one tire size..but jumping two makes me
a little nervous for all the reasons given.
My only reason for using the larger tires is that I can
get a set of new tires and rims complete for about $100.
On the existing car...the rims and tires have been beat
to sh..t. My significant others bumped a lot of curbs when
moving up from a honda to a full size gm... I think she's past
this by now.
The charts help out a lot with the speed and shift differences...
Guess the only way to make sure is to take the plunge and
see how the car operates..... I can always replace the old
wheels if necessary.
Thanks again for your help !!!
Hey Peter, where you said, "I wouldn't mind going up or down one tire
size..but jumping two makes me a little nervous" , you are actually going
TALLER by 3 sizes when it comes to height--205-to-215= 1 height. 215-to-225
makes a 2nd height. Lastly, 225/70-to 225/75 makes another height increase,
for a total of 3 height jumps. (IE, an xxx/75 is one height taller than an
xxx/70. Remember the "low profile" descripts of the "seventy-series"? Just
information to consider.) Luck to you. s
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