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.
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.
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
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.
'72 97 '77 96 '78 95 '79 96
Not as much difference there.
Let's compare using one tire manufacturer; Michelin Energy MXV4 Plus:
Tire size Diameter
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.
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.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.