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Old 10-18-2012, 12:36 PM   #51 (permalink)
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Old 10-18-2012, 04:32 PM   #52 (permalink)
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Quote:
Originally Posted by CapriRacer View Post
I don't know about that. My calculations say the opposite.

Barry's Tire Tech

Last bit on the page.
OK, so from your perspective, what's the best 15" tire to put on my BMW 325is?
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Old 10-19-2012, 09:01 AM   #53 (permalink)
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OK, so from your perspective, what's the best 15" tire to put on my BMW 325is?
First, my expertise is in the engineering side of tires - how they do what they do and the like. I don't - and can't - keep up in what is currently available and how they compare to each other.

But you said "best". Best for what property? Wear, RR, cost? You have to answer that question first before searching for what you want.
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Old 10-19-2012, 09:19 AM   #54 (permalink)
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Have always figured that the accident risk is several times higher under adverse weather in that vein I set up my car for worst case. Dry handling is a no brainer, slip angles are only a fraction of bad weather.

I always try and pick tires that have a tread no wider than the wheel rim width. Going bigger means that I will have a tire tread that is bowed a lot more and is subject to uneven wear particularly at higher pressures.

Wide tires make for slippery handling in the wet and snow. Wide has to clear a lot more material in front of tire so that it can come in contact with the road.
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Old 10-19-2012, 05:47 PM   #55 (permalink)
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Originally Posted by CapriRacer View Post
First, my expertise is in the engineering side of tires - how they do what they do and the like. I don't - and can't - keep up in what is currently available and how they compare to each other.

But you said "best". Best for what property? Wear, RR, cost? You have to answer that question first before searching for what you want.

RR and fuel efficiency @ ~75mph
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Old 10-20-2012, 12:47 PM   #56 (permalink)
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aero and EPA

There is an SAE Paper from the 1970s which includes the relationship between aero drag and mpg obtained with the Federal Test Procedures for HWY and City cycles.
I'll dig that out when I can.
Revisiting an article for GM's 1984 Chevrolet Citation IV concept car,GM mentioned to CAR and DRIVER that narrower tires(P195/70R-13) were part of their strategy for their low drag.
Ford,for their Probe IV concept,choose P155/75R-16 Goodyear LDC-1 concept tires.

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