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Originally Posted by Uwe_rossi
But the trainer said that the rear axle guides the car and there should be the best tyres.
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This is definitely true. If you have a set with 2 "poor" tires (e.g. 3mm) and an almost new one (e.g. 7mm) you should put the better ones to the rear.
I tested the importance of guidance of the rear wheels on my old VW years ago with a set of 2 older bias-ply-tires (Diagonalreifen) - they still had enough profile! - and 2 radial tires (Gürtelreifen). Using the bias-ply-tires in the front has no remarkable negative effect, even on a wet road. But using the bias-ply-tires in the rear it was very hazardous driving in the rain, because the rear would swerve quite a bit.
But the effect is - of course - less if you have four still good tires, let's say 2x 7mm and 2x 5mm. I would put the 7mm-tires in the front, because at the end of the season I have 4 tires with the same wear.
This is what I prefer, so I also rotate my tires when changing as others already stated.
That means that I will not have to buy new tires in a while, but when they are due, I have to change all 4 of them.
Always putting the best tires in the back means that the front tires wear out a lot earlier than the rear ones, so you will have to exchange 2 tires a lot earlier. Then of course you will put the better tires to the back, so the "old" front tires will start wearing out quickly. That also makes sense.
The difference probably is what you prefer: buying 4 tires the same time less often or buy 2 tires the same time more often.
But again: if there is a significant difference of 4mm or more, I would put the better two to the rear - so I voted "best to the rear".
Regards Jörg