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Tyre pressures for Michelin Pilot S4S

jonathanw

jonathanw

PCGB Member
Member
Hi
I have just replaced the tyres on my 991.1S cab from Pirellis to Michelin Pilot SP4S (NO) . The pressures for the front as the tyre size is the same as the Pirellis is not a problem but the rear Pirellis were 295/30/20 and as Michelin does not make an NO in this size I have fitted the 305/30/20. What pressure should I run the rears when light or heavy loaded?
I'd be grateful for advice.
Have just completed my first drive along winding country roads and there seems quite a difference ( had all 4 wheel geometry fixed). So far impressed.
 
Hi Jonathan
The 991 GTS has 305 tyres on the back and the recommended comfort pressure is 2.4 Bar. I think the recommended pressure on your car with 295 tyres is 2.7 Bar. So it would be worth trying the lower pressure and see how you find it.
 
Pressures from handbook 991.1 Turbo S with rear 305/30/20 summer tyres are
part load 3.0 standard, 2.5 comfort
full load 3.3 standard 2.8 comfort

Wheel size is 11.5J x 20,RO56

The Turbo S is a bit heavier than the GTS which probably accounts for the slightly higher pressures.

I run the Michelin Pilot SP4S and find them great and last much longer than the Pirellis.
Cheers

 
I now feel rather stupid as the answer to my post was in plane sight. I should have looked at the details on the drivers door jamb which quite clearly showed that 305/30/ZR 20s were quite acceptable for my 991.1 S and that the tyre pressures were the same for 295 and 305 !!
A question of RTFM ( read the f manual) again.

 
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