tire air pressure for bmw e9 with michelin xwx

tyre pressure.

assuming you mean 195/70R14 them it is 28psi all round for 2 pax and 31psi all round for 4pax plus luggage/
 
I use 1,8 Kg all round when alone on normal roads.
2,1 when fully loaded on the Autobahn, doing >100 MPH for long stretches.

This is probably less than recommended, but gives a very nice and comfortable ride. So much volume in the tyres that they don´t need to be as hard as current tyres on passenger cars.
 
Tire pressure all round

With XWX as well as XVS, etc early tires have always inflated to 32 psi for all round driving on 14" tires--comparable to your 2.1 atmosperes when loaded for autobahn sustained speeds.
 
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