33"
My Ranger is a 88 2.9 auto with factory gearing and 33" Baja Claws. No worries off road, tires work great and haven't run out of horse power yet and haven't broken anything.... well, I DID brake a right front axle AND my T-case when I slid head-long into an erosion ditch that ran across the trail but on the whole I don't abuse it.
On the highway it's a bit lethargic, takes a while to get up to speed and seems to labor a bit.
I wouldn't use pure off road tires for every day driving because everything suffers, fuel mileage, tire ware, strain on the drive line and so on. Since my truck is mostly a toy and I don't drive it long distances (trailer it to far away trails) I have no problem with it.