4-Trak tyre pressures?



I've got 265/70/R15 tyres on my trak (just bought it) and on the door it says the pressures on the front should be 29psi and the back 26psi - but for smaller tyres - is it OK to run these tyres at these pressures, the trak seems to handle OK but I don't want to wear tyres prematurely.

Thanks in advance for any replies.