m21sniper

Thank you Matt H.

The first 3 digit number is the tread width in mm, the second is aspect ratio, the third is rim size.

245/45/16 means 245mm tread width, a sidewall 45% the height of the tread width(110.25mm), and a 16" rim.

255/45/16 is 255mm tread, 114.75mm sidewall, and a 16" rim.

m21sniper

Matt: "No, we dont and neither does anyone else with a brand name. Please, show me what you have. We havent made that size in about 8 years, if not longer."

I just saw some guy post on a site that he was using Bridgestone 255/45/16s earlier today. If you discontinued them, you'd certainly know better than i!

My appologies.

As far as using 225/50/16s up front and 245/45/16s up front, i did that on my 928 for about a week.

It looked stupid.....the front tire sidewall really looked misplaced with the one on the 245, and the tire was obviously taller. Made the car sit funny.

I'm running 245/45/16s all the way round now.

Matt H

No need to apologize. It is possible the person who posted is in Europe or Japan and there is a possibility that there are still BS tires available in that size. In the US they have not been available for a long time!
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m21sniper

Gotcha! Still a whoops on my part though.

What's the next biggest size in a 45 aspect ratio for 16 tires?

Matt H

In a non-competition tire there isnt one. In a comp tire Kumho makes a 265/45R16, that is really too big for the 8" wheel and it is nice for the 9" but it is tall. They really made that tire for Camaros/Mustangs.

The 16" tires (as well as 15") are dead. For that matter, one could argue that in a 25" OD (that would be most European cars:BMW, Porsche, Audi, etc) that 17" is really dead. Aside from stock sizes manufacturers no longer spend a lot of time/money on 17" development.
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centerpunch

I've run 245-45-16's on all 4 wheels (8"F, 9"R) on my Turbo Cup car since I bought new it in 1987. Works great!

Regarding the exact measurements of specific tires, you really need to look at the manufacturer's specs for each tire. The exact dimensions of tires of "identical" sizes can vary quite a bit. Tire Rack has specs on their site.

Oddjob

Centerpunch,

I just sent you a private message with respect to your Cup car. I would like to ask you a few questions when you have time.

Thanks.

Z-man

Nope - it would still increase the tendency to understeer. While yo may have more grip, the car will be more unbalanced front to rear, with the 'grip bias' going to the rear. So when the car does start to loose grip, the understeer will be greater, and the driver will have to slow down more in order to overcome the understeer. Granted, with the increased grip the car may be able to go faster before it's limits are approached, but it will be more difficult to recover.

Our cars first and foremost UNDERSTEER. That's the way they were designed. When setting up a 951 / 944S2 / 968 for the track, it's always a battle against understeer.
-Z.