Your tractor's original equipment is often not the most suitable. For cost reasons, manufacturers often fit them with the cheapest option. So, you have the choice to change the size of your tractor driving wheel tyres. Just remember there are a few rules you must respect. The tractor's balance must be respected, this is the synchronisation between the front and rear tyres.
Here's how to calculate the balance of your tractor:
((Front bearing circumference x front axle mechanical ratio) - (Rear bearing circumference) / Rear bearing circumference) x 100.
This value must always remain below 3%, or you risk increasing your fuel consumption and your tractor's transmission will wear out faster.