As no-one has come up with definitive tyre pressures - the MG Midget Mk III
1967 handbook says:-
Wheel size: disc 3.5Dx13; wire 4Jxl3 5.20x13
Tyre size and type Dunlop C41 Gold Seal (Nylon) Tubeless 5.20x13
SP 41 - Tubed Radial (still a stiffish one)
Tyre pressures (set cold):
Normal . . . . Heavy duty . . . . SP41
Front . . . . . 19 psi . . . . . . 22 psi
Rear . . . . . 20 psi . . . . . . 24psi
For sustained speed in excess of 80-85mph
Front . . . . . 22 psi . . . . . . 22 psi
Rear . . . . . 24 psi . . . . . . 24psi
Haynes Workshop Manual states:
Crossply . . . . . . Front . . . . . . . Rear
Normal driving . 18psi 20psi
Max load . . . . . 18psi 24psi
High Speed . . . . 22psi 28psi
Radial . . . . . . . . . Front . . . . . . . Rear
Normal driving . 22psi 24psi
Max load . . . . . 22psi 26psi
High Speed . . . . 28psi 30psi
Mine ran normally at 28front / 30rear, upping to 30f/30r for a lightweight
fast run and 32f/34r for a loaded run. My tyre pressure gauge was bought
certified and was checked around 3 years ago and was still correct. (I
should have it checked again.) Wear was even across the tread.
Guy R Day
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