Thread: Where would you put the new tyre

Originally Posted by Mungus

Only did front to back as they said the wear was greater than 1.5mm difference to the unused spare and could not be done as it would cause the wheel speed sensor to throw a fault.

I guess the question is how much more, but 1.5mm? Really? That's a difference of around 0.2% on the rolling diameter. I find it very difficult to believe that would cause a problem. Tyre pressures and temperatures will make a bigger difference than that.

I think it's bad practice to put tyres with significantly different wear on the same axle purely from a performance point of view and if I destroy one tyre I will generally replace two, even if it's with the spare. Of course dealing with a flat tyre on the road is completely different.

Cheers,
Jon

I did notice recently that mine let me know it had a tyre with a screw in it and a slow leak by some unexpected DSC activation. This behaviour was evident when one front tyre got to about 20psi - not sure what reduction in rolling diameter this is compared to the other tyres.

I too only do 4 tyre rotations on all my vehicles. This is not exactly classy as I've owned one of my cars for the past 23 years and it still has the factory supplied tyre as a spare (has been used once in that time) ... ... I probably should care about this but as this car pretty much only does town duties these days it's no big deal.