for tire size wut does 33x12.50x18 mean?a person asked wut the biggest size tire he could have with an 18 tireisnt the size 18?
33 is 33 tall 12.5 is 12.5 wide 18 is 18 diameter the biggest you can have on !8 is the diameter but height and width could be bigger or smaller.like a 4x4's 18 tire is going to be bigger than a cars 18 tire because of the (profile) side wall.
The biggest size tire is about the car or truck is being put on. If, say, a Toyota Pickup can take a 31 tire without being lifted, it doesn't matter what the rim size is (the 18 in your question) it is the overall height of the tire that matters. A car that can take 31 regularly, it can take a 33 when it has a 2 inch lift. The 12.50 is width at the widest point of the bow out in the sidewall, not the actual tread width.
well the diameter isnt the only thing that matters u need to match the width of your old tires and then you can move up on the outside diameter of the tires making the tread thicker
