That is what I read on my manuals:

205 / 70 R 14 93 Q
                 =5ESpeedindex
               =5ELoadindex
           =5ERim diameter
         =5ERadial Wheels
      =5EHigh to Width relation
=5EWidth

Vanagon factory originals:
 Standard rims      5,5 J x 14 ET 39
 Standard rims      6   J x 14
 Light truck        700   - 14   8 PR
 Vanagon            185   R 14 C 6 PR (520 kg - 600 kg)
 Vanagon de Luxe    185  SR 14 Reinforced 94 R (670 kg)
 Caravelle Carat    205/70R 14

Loadindex:   Speedindex:
90  600 kg   K  110 km/h
91  615 kg   L  120 km/h
92  630 kg   M  130 km/h
93  650 kg   N  140 km/h
94  670 kg   P  150 km/h
95  690 kg   Q  160 km/h
96  710 kg   R  170 km/h
97  730 kg   S  180 km/h
98  750 kg   T  190 km/h
99  775 kg   H  210 km/h
100 800 kg   V  240 km/h

Pressure for standard tires

tire             front rear spare

7.00-14 8 PR     2.3   3.3  3.3
185 R 14 C 6 PR  2.6   3.8  3.8
185 SR 14 reinf. 2.3   2.9  2.9
205/70 R 14      2.1   2.5  2.5

All dimensions in 'bar'; 1 bar is equal to:
10=5E5 Pa; 10=5E6 my bar; 1000 hPa; 0.1 N/mm=5E2;
0.0102 kp/mm=5E2; 1.0197 at; 10197 kp/m=5E2;
750.06 Torr; 0.9869 atm; 14.5037 lbf/in=5E2;
2088.6 lbf/ft=5E2

But what are the relations to psi?

Helmut
'80 Camper