Question from visitor, 19/04/2013 :

I’ve a 2007 BMW Z4 (E85) coupe 2.0l, and am due to replace the rears, am thinking of switching to non run flats but note lots of conversations about negative impact from using higher load rating tyres (either Continental SC5’s or Goodyear E F1 A2’s are both 94XL), so will there be any issues running:

1) Non run flats on rear until the fronts wear out and can have all the same?
2) How do I adjust from the standard PSI pressure to accommodate the higher load rating?

Many Thanks

Answer by rezulteo, 19/04/2013 :

Hello there :)

Thank you for your questions.

We wouldn’t recommend fitting run-flat tyres on one axle and non run-flat tyres on the other as it can have a negative impact on your car’s handling. You can read more in this guide.

You can fit tyres with a higher load index. For the pressure, you should check with the manufacturer for the recommended pressure for the new tyre size. You could also take a look at the guideline pressures for your Z4 Coupe in our vehicle directory (simply scroll down to view the pressures for different sizes). 

You can also check our tyre catalogue for more details (including all available sizes) on the Continental ContiSportContact 5 and Goodyear Eagle F1 Asymmetric 2.

If you’re thinking about switching from run-flat to normal tyres, it is also a good idea to check with your car dealer that fitting a normal tyre won’t interfere with the suspension and electronic control systems (ABS, etc.) They will also be able to advise you about any potential consequences of fitting higher load tyres.

Finally, if you’re replacing run-flats with non run-flats it might be a good idea to get yourself a spare wheel!

Hope this helps.

Happy driving!

The rezulteo team

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