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Date: 14 Jan 2006 02:12:57 -0800
From: "Al" <alistairdorenospamo.com>
Subject: Re: New tyres fitted to rear?


Johannes H Andersen wrote: > Al wrote: > > > > Just had two new tyres fitted to my 1987 900 Aero. > > > > Costco insisted that the new tyres were fitted to the rear not the front, > > apparently they have been told by Michelin not to carry out customers wishes > > and fit newer tyres to the front. They were playing a "police" video which > > demonstrated the "problem" i.e. more grip on the new front tyres leads to > > the car oversteer and skidding/spinning. > > I have heard this explanation, but it is also a bit of a mystery to me. > If braking in the wet depends on thread depth, then you get the shortest > braking distance when the new tyres are fitted at the front. The instability > problem must be an extreme case with worn out rear tyres and a very front > heavy car. > > In practical terms, new tyres are always better than old tyres; they degrade > in a linear fashion from 8mm and down to 1.6mm or whatever. Since we can't > afford to change tyres as often as a F1 racing team, we must adjust our > driving to the current state the tyres. Johannes thankyou! I think your first paragraph explains my thinking far better than I did. Laura I'm in full agreement on both of your points, i.e. not using Firestones and needing that coffee! Al

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