Yes, its a 4x4...and I think they're R1 agricultural tires...albeit from the late 90s.
Then, find out and tell me what the size of the front tires are.
When you consider any vehicle with 4 wheels, regardless if it is 4 wheel or two wheel drive, there are some very basic physics to when it travels.
When you turn a corner, the inside wheels travel a shorter distance than the outside wheels otherwise the vehicle would just go straight.
To compensate for the different lengths of travel on an inside vs and outside wheel, the axle with those 2 wheels on it will have a differential gear absorbing the different length paths taken.
The one 4 wheel vehicle where this differential is not used is on the Quads which are like ATVs' but 2 wheel drive. But to turn them on pavement requires the operator to shift his/her weight to the outside of the turn so the inside wheel can slip. Go carts same story, Their frames are made to flex so the inside rear wheel can lift off the ground so they can turn a corner.
Back to tractors.
When turning a corner, the rear axle tires travel a shorter path than the front axle tires. That is why you see the rear tires of cars and trucks going over curbs when they turn. You can see the different paths if you drive through a puddle and then make a turn on dry pavement.
On cars and modern light trucks which are equipped with All wheel drive, a system which is always driving all the wheels, there is a third differential absorbing or compensating for the different lengths of travel of the front and rear axles.
A tractor does not have this third differential as it is not intended to be doing heavy work on pavement. When it is going to be driven on pavement it must be in two wheel drive or it is very hard to steer and damaging to the drive line.
The designers of the 4x4 tractors take the different path lengths into consideration by having the front axle geared to travel a small percentage further than the rear axle. It might be 5% approximately. When I wanted different tread tires and therefor needed different wheels, Kubota has done the homework and sized the alternative front and rear wheels to have this same difference in travel.
That is why you cannot stick any wheel on a 4x4 tractor just because it will fit on the studs. It could be totally wrong for the required ratio between the front and rear travel distance.
Dave M7040
