I'm running 205/17/40s on my indy,checked tyre pressures yesterday although they were all between 10/10.5 I thought that was a bit low. cheers guys Keith

IIRC the common thoughts are about 18psi all round. Thats what most people run and thats what I run. 10psi seems very low!

HTH

Many thanks

Got 14psi in mine but thinking of raising that a bit.. the backs squirm when cornering hard

18 psi all round

On a dry road, mark wth chalk or crayon 4 to 6 lines on the treads spanning across each tire, push the car enough to do a couple of revs, then check how the lines vanish.
If the center of the lines wear first, then it is too much, if the sides, then too low.
Adjust pressure a couple of psi as required, then retest.
Repeat until you are satisfied with "wear" pattern.
this test may point to camber issues too.