Step 1: Defining Each Term
- Ground Clearance: The height between the lowest point of the tractor and the ground.
- Track: Distance between the two wheels on the same axle.
- Wheelbase: Distance between the front and rear wheels, measured at ground contact.
- Turning Space: The area required for the tractor to make a turn.
Step 2: Conclusion
The wheelbase is the correct term for the horizontal distance between the front and rear wheels.