I modified the wheels on my toyota estima (Lucida) van with the above size of tyres. I inflated the tyres to 39 PSI but they look under inflated especially the front. I inflated them to 45 PSI and the rear looks OK but front still looks a bit underinflated. The tyres are allowed a max of 50 PSI. Is it alright to inflate the front tyres to the max PSI indicated?