Jul 01, 2014· You do not have a 33.5 inch tires. Period. I have 33x12.50's, meaning my tires are 33 inches tall. If I put 5 people in my jeep and the tires "weigh down", I still have 33 inch tires. If I air down the tires to 15 PSI, then sure - they will be shorter if I measure them, but they are still a 33 inch tire. 295/70-18 converts to exactly 34.3 inches.