OK to mix 195/60/R15 and 195/65 R 15 91V tires?

Have a question or want to start a discussion? Post it! No Registration Necessary.  Now with pictures!

Threaded View
I have a  1992 Saab 900 convertible turbo. Is it Ok to have 195/60/R15
tires on the back, and 195/65/R15 tires on the front? I have a chance to
get four new Pirelli tires, but they don't match. I assume it's not a big
deal, that the 60 to 65 won't make a difference in driving or performance.
But thought I'd ask. First-time Saab buyer.


Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?
madison41 wrote:
Quoted text here. Click to load it


Yes, as long as you mix as you say front/back. You can't have two
different ones on the same axle. That would drive very odd indeed.


--
Grunff

Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?
Grunff wrote:
Quoted text here. Click to load it

...and probably play games with the ABS as well.  The 60's and 65's will
have a slightly different circumference.

-Fred W

Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?

Quoted text here. Click to load it
No, if the car has ABS, as the different rolling diameter will confuse the
hell out of the ABS, regards, Tom.



Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?

Quoted text here. Click to load it

I had 185/65 front 195/60 rear on my beater 9000i - the ABS was fine.


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com ).
We've slightly trimmed the long signature. Click to see the full one.
Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?

Quoted text here. Click to load it
That gives you only 6.5 mm difference in diameter. Not a big deal. Uneven
treadwear can cause larger difference in diameter, easily.

However, diameter difference between 195/60-15 and 195/65-15 is 19.5mm,
which may start confusing ABS, especially if 195/65-15 happens to be brand
new and 195/60-15 is already worn out.

BR:Z



Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?
Quoted text here. Click to load it

If that is the case you would be in trouble when going through a tight curve
wher the outside wheel turns faster than the inside wheel, the ABS should
not care.

Quoted text here. Click to load it

I can imagine that would be OK; the ABS would only 'look at' individual
wheels to see if that wheel is locked when it should not be, not at the
possibly different speeds or speed ratios of all the wheels.

--
MH
'72 97 '77 96 '78 95 '79 96
'87 900T8
We've slightly trimmed the long signature. Click to see the full one.
Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?
chris wrote:
Quoted text here. Click to load it

Not as much difference there.
Let's compare using one tire manufacturer; Michelin Energy MXV4 Plus:

Tire size        Diameter    

195/65-15    24.9"
195/60-15    24.1"
185/65-15    24.5"

So using the above stats (pulled from the tirerack.com web site) the
difference between 195/60 and 195/65 is 3.3%.

The difference between your 185/65 and 195/60's is half that (1.7%).
The larger the difference is the more likely you are to get into trouble
with the ABS computer.

-Fred W

Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?
chris wrote:

Quoted text here. Click to load it

You can run with the different size tires. Different footprints will
result in slightly different handling. As long as you do not push to the
limits of handling, you should be fine. But it is a turbo convertible -
so how hard do you drive it?  It would have more body flex than the
hardtop.  This was very noticeable the first time I drove a Saab
convertible after driving the 3 door hatchback body style for years.


Site Timeline