About 2 bar Chris, maybe even a bit less, depends on wether you have inner tubes or not.
I have always put a wee nit more air in the tubeless ones I have on the car.
Onne van der S. MMOCno 60520 Moderator
2dr 1971 White DAF 55 (with hopefully a 1600cc engine soon)
2dr 1973 Bergina (DAF 44)
2dr Estate 1975 DAF 46 in red
2dr saloon 1972 DAF 44 in Mimosa