GManBart
Elite Member
- Joined
- Dec 10, 2012
- Messages
- 4,976
- Location
- Detroit, Michigan
- Tractor
- Massey Ferguson 241, Kubota SVL90-2
R1's and R4's are usually different size so the ratio will be wrong for 4WD.
There is a fair amount of wiggle room there to account for uneven wear, tire pressure differences, etc, but it shouldn't be too hard to get R4s in the correct overall diameter.