[Healeys] Tire Pressure

[Guy R Day]

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