37" maxxis creepy crawlers @ 4psi. I have redlined the 3rz in double low and never broken a thing.
I have been running them a couple years now on 39 inch bfg red label crawlers and about 5 psi with no breaks at all and i have used it plenty hard they are worth the cost
Thats a true testament if they are standing up to red label 39's
![Driving :driving:](https://board.marlincrawler.com/Smileys/marlin/driving.gif)