The machine didn't just pop onto the scene as is. Tractors are primarily pulling machines. The addition of 4x4 is new. so are loaders and other attachments. If you are looking for a pure loader machine, you will find articulated loaders hae the same sized wheels front and rear. That brings us to another reason for smaller front tires, so that they can steer. your cut angle would have to drop off dramatically if the fronts were the same size as the rears. Artiulated loaders/dozers don't worry about cut angle so much as they steer by articulating. Skid steers steer by skidding. The thing most like tractors that steer life tractors witht he same sized wheels front and rear have small tires front and rear; thinking toolcats and tellehandlers here. Some of the newer backhoes are getting close to the same sized front and rear, but while the fronts are a bit bigger than they used to be, the rears are much smaller than they used to be.
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