Do I need 160 PSI or is 150 PSI enough?

For cars, SUVs, motorcycles, and bicycles, 100–120 PSI is plenty. The 150–160 PSI ratings matter mainly for high-pressure road bike tires, light-truck/RV tires, and heavy-duty applications. Reviewers note most inflators slow dramatically above 60 PSI, so headroom matters more than peak spec.