Approach angle: Ground clearance in front of or behind vehicle.
Belt Length: Length of a belt between and around two pulleys.
Belt Speed: Speed of belt based on pulley RPMs and diameter.
Pulley RPMs: Pulley RPM based on belt speed and pulley diameter.
2nd Pulley RPMs: RPMs of second pulley connected to a pulley, based on RPM and diameter of primary pulley and diameter of 2nd pulley.
2nd Pulley Diameter: Diameter needed of a second pulley connected to a primary pulley based on primary pulley diameter and RPMs, and desired RPMs of second pulley.