been looking in the astra owners manual about tyre pressures and it says for a coupe z20let
with 215/40/17 tyres its 39 front and 36 rear? thats up to three persons
with 205/50/16 tyres its 36 front and 33 rear?
am i right in thinking this is abit accessive?
had a little search and people seem to be putting 32 front and 28 rear.
now i have standard 888 alloys with 235/40/17 so what would the presure be?
the car had 32psi when i brought it but had quite bad wear on the outer edges of the tyres, suggesting more pressure needed?
how would i go about finding out what pressure i need?