Stupid Wheel/Tire question

I'm looking to get new tires. The tread on mine have MAYBE 10k left. This will be the first set I have to buy for my truck as it came with new tires already. I have 33x12.5R18 Toyo Open Country M/Ts on 18x12 Fuel Mavericks (at least I think thats the dimension of the wheels. Truck came with them). I'm looking online and I can't find the correct size tire when I put in the dimensions. 33x12.5R18 converts to 318/60/R18 but no website carries that. They have 315s or 320s or 325s. How much of a difference would these make?

 

If a 35 in tire converts to a 318 and only size available is a 315 then it’s 3mm smaller in width...320 is 2mm it’s not much.

 

There's a tire size calc you can Google that will show your current size directly behind your new tire size. You should be able to find it by just searching "tire size compare" in Google search.

 

= 33.6x12R18 = 33.4x12.8R18

 

Check customwheeloffset.com also if you can take your wheel off there should be a stamp of size somewhere inside wheel on the backside

 

Tire sizes are rounded to the nearest 5. They’re never exact. Just get the closest size and you’ll be ok. Those 33’s aren’t exactly 33x12.5 neither. And they’re not stock size neither so you don’t have to be exact. Overall diameter is more important. But personally I wouldn’t get wider than 315’s, that’s pushing the width limit of your wheels.