1. OEM front Tiron brand 23x8.50x12 R4 4 ply which remained because it was right for the job....fat tire for it's size and low aspect ratio (maybe 50) which reduces squirming of the sidewall during loader operations. Runs fine on 30# of air.
2. Rear Carlisle 8-16 R1 6 ply and installation of 4 inch spacer shown in 4 and 5.....4x8" dia schedule 40 steel pipe, シ" steel plates on both sides. Added spacer for stability before I started diddling with tires. Selected 4" as that put the outside of my OEM R4s inside my 5' mower I use with this tractor.
3. OEM tire (12x16.5 R4 6 ply) sitting on top of 33x 12.5-16 showing OD identical. Turf required a new wheel diameter as there were no 16.5 tires available....had to go to 16x6 wheel.
The Carlisle R1 is 6 ply but typical to R1s, the sidewall is soft. Being narrow and soft, I can run 10# of air, maintain the tire to rim seal...which is hard to do on new, shiny, slick, painted wheels with tubeless tires and have a reasonably soft ride.