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Author: geoffer
Time: 01/19/10 06:30 PST
This is a reply to message no. 7 by dora
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Current Topic:
What is a 185/70 R14 (88T) tire?

185/70 R14 (88T) is a tyre that is 185mm wide, 70 is the aspect ratio, the depth of the sidewall as a %age of the width, in this case 70% and on a 14 inch rim.

The 88T is the load and speed rating. 88T means the tyre can sustain a load of 560kg at a max speed of 190kph (119mph). It is normal for the combined load for all 4 tyres to be 25% more than the mass of the car to allow for uneven load.

As for the F1 question, please see this post from a chap called Clausius2 on physics forums:

'I have asked to myself that question several times, and I always arrive to the conclusion that the independence of the coeficient of friction on surface is only valid under some assumptions made about the contact. That contact must be the contact of two infinitely rigid surface, with no deformation, as we are said in the elementary physics class. Later, in tribology of machines one realises that friction is made up by means of adhesion, and the theory of adhesion talks about microwelding and deformation of both surfaces. Let's say that at first order the friction coefficient is independent of the surface, but at second order it is not. Definitely, wider tyres do larger grip and larger traction capacity'

Hope this helps.

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