Category: Science > Technology
Asked by: deco22-ga
List Price: $20.00
07 Oct 2006 01:12 PDT
Expires: 06 Nov 2006 00:12 PST
Question ID: 771484
My small van has two tire options as tire choices: 170/70 14 or 175/75 14. 1. I am currently driving on 170/70 14 tires. If I switch to 175/75 14 what will I feel or notice? Different steering response? road holding? braking? speedometer reading? 2. What is the advantage (if any) for going to a 175/75 size? 3. Hypothetical: If the pressures are the same for the different sizes will there be a diffence in size of contact patch? 4. The car manufacturer list pressures for heavy loads and light loads (driver and passenger). By using the lesser pressure I get a more comfortable ride. I also noticed that when the pressure is "normal" (for light loads) that the van's braking distance seems to be shortened. I assume that this is due to more tire contact patch surface on the road because as the pressure increases the tire presses less on the road and when I?m driving with normal pressure that there is more rubber on the ground and consequently this adds more friction for better braking. Am I correct?
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Re: Tire Pressures
From: stanmartin1952-ga on 07 Oct 2006 11:19 PDT
I think your van has two tire options because they are almost the same.
Re: Tire Pressures
From: knickers-ga on 11 Oct 2006 15:06 PDT
Tire technology is a complex science.First of all your tire sizes. The first number i.e. 170 is the tire width. The second number 70 is the aspect ratio i.e. 0.7 of the width. The smaller the number the smaller the tire wall width. This means lower profile better handling because of less flex in the wall. But it gives a rougher ride. Tire pressure does change contact area and hence amount of grip. However, it also changes flex in the wall, heath build up and hence wear. A low pressure tire will wear more quickly and can suffer a dramatic wall blow out because of wall fatigue / splits. Correctly inflated tires give better braking distance than underinflated tires because energy is not absorbed by the wall flexing and more goes into breaking. Your tires are fairly close in size and probably not alot of differnce. Probably tread pattern will count for more.
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