Did you read that link ?? It makes zero sense,,,it says the first number is the dia of the tire then it says the first number is the height...no matter the rear tire first number is 12....the front first number is 33....33 is BIGGER than 12...but the rear tire is MUCH bigger than the front ...
Tire size on my kubota They measure the rear tire different only two numbers not three Tractor Tire Sizes
Industrial front: 27x8.50-15 (4WD)
Industrial rear: 15-19.5