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The staggard tires need to have the same revolutions per mile and I dont think the sizes you posted are

Quote:

Originally Posted by motordavid

Uncle Bob,
Correctomundo on wheel dia, but I suspect we were getting at the
fact that thinner width tires are going to be hard/impossible to find
in 20" dia. 18s, even 17s will be easier to find in snow tire size and
the resulting preferred narrower width.

ah yes, i see your point about the relationship. never thought of it that way.
obviously my point was that a 235 would be 235 on a 17" or 20". I never thought about finding a 235 on a 20" wheel though. Now i get it.

I appreciate it. Just hate the way a 4.8is looks with 19's or even 18's.

6 inches of snow here in Northern Wisconsin tonight. I'm putting on my blizzaks tomorrow!!!

Will 275-40-20 Pirelli Scorpion Ice and Snow tires fit on the rear of the 4.8is wheels?

Quote:

Originally Posted by rgnbull1227

Will 275-40-20 Pirelli Scorpion Ice and Snow tires fit on the rear of the 4.8is wheels?

I was under the impression that wide, large wheels are very bad in the snow, plus the 275s are for a 9.5" wheel and the rear is 10.5"

I have been running the OEM 18 inch tires in the winter, not sure that you need dedicated snows?

Yes they will work yhe spec sheet said 9 inch to 11 inch bridgstone blizzak dm-23 265/50/20 are about 100 bucks less

Going with 4 275-40-20 Pirelli Scorpion Ice and Snow tires. Spoke with 3 other people that used the same set up on there 4.8's and worked great in the snow.

Quote:

Originally Posted by Secure

It's the area of tire in contact with the ground, when it comes to snow you want to reduce it. The higher the PSI to the ground the better. An aggressive snow tread is important as well. I would want to keep the car as far away from road salt as possible. Our cars always turned into swiss cheese driving in northern Wisconsin.

Close, but not quite.

For a given vehicle, and a given tire pressure, any tire (wide or narrow) will have the same area of footprint. The PSI to the ground is the same as the PSI inside the tire. What does vary is the shape of the contact patch. A wide tire will have a wide but short contact patch, while a narrow tire will have a narrow but long contact patch. They both have the same static ground pressure. Dynamically, the shapes matter because the wide tire has a longer 'leading edge' and is always climbing up out of the rut, while a narrower tire puts more of the contact patch in the rut.

Having said all that, old technology winter tires only really drove at the edge of the tread, so the narrower tire had much more traction. Modern winter tires are designed to grip across the tread, so it is possible to have wide winter tires that perform. Even two years of design evolution makes a huge difference in winter tires.