First off the word is TYRE mmmmmkkkkaaaayyy
Vulcan rider is correct the manual tyre pressure only applies to the original tyre. other tyres fitted though the same profile may require a different pressure +/- a few PSI from the original. The pressure moulded onto the TYRE sidewall is MAX pressure it is designed to operate too.
Usually the tyre manufacture has a website that will give the correct tyre pressure for the most common types of car and THAT is the figure you should use.
TYRE pressures are extremely important and over pressure is just as bad as under pressure but for different reasons