It is more difficult to steer with big tires, they are smaller so they are managable, also the weight on a tractor and traction is needed in the rear
A "mechanical front wheel drive" tractor has front-wheel-assist which means that not only the rear drive wheels pull the tractor ahead, but the front wheels also pull the tractor.
If the tractor trailers has duels only. You have 18 weels. (10 on front 8 on back) If the tractor trailers has super singles only, you got 10 wheels (6 wheels on the front and 4 on the back) If the trailer has super singles only, you have 14 wheels, (tractor has 10 wheels and trailer has 4) If your tractor has super singles only you looking at having, 14 wheels (6 wheels on the front 8 on the back)
with your eyes
When you turn the front wheels, they skid sideways as they turn. The skidding wears rubber off the tire.
A tractor weight is either put on the wheels as wheel weights or as suitcase weights in the front of the tractor. they add stability and traction.
The prefix "semi-" means "half", and the standard tractor-trailer articulated vehicle is called a "semi" because of the trailers they pull. A "full" trailer has wheels in the front and back, like a railway car, and connects to the tractor from the front. A "semi-trailer" (or, essentially, "half-trailer") only has wheels in the back, and the front sits over the back wheels of the tractor pulling it.
They are broader for better traction.
tractors are meant to be on uneasy grounds plus there are meant to pull things and balance and stability
its to do with gearing think about having small wheels on the back they.d never push the big wheels
The front wheel(s) are only for steering and holding the front end up. The back wheels supply the power and must have traction. Making them big lets them carry big tires which keeps the tractor from getting stuck in muddy fields and keeps them from slipping so easily. The big lugs on the tires also help in that regard.
assuming we are talking about a rear wheel drive vehicle, the smaller wheels weigh less and provide the least resistance.
When you turn the front wheels, they skid sideways as they turn. The skidding wears rubber off the tire.