This calculator estimates the Ramp Travel Index (RTI) without having access to a "real" ramp.
Since this is based on math we can use a formula to estimate your RTI. The trick is to get one tire off the ground while the other three remain touching the ground. Then measure from the bottom of the lifted tire to ground. I've seen forklifts being used, climbing up a steep rock face, even climbing stairs. I suppose you could climb different things and use the calculator to find the RTIs. Then take the average of all. In any event, if you're curious I've provided a calculator that will get you an idea of your RTI. Anything above a 500 is great, there are a few rigs out there that can do perfect 1000's or better. How will you do?
RTI = Tire Height/sin(20*PI/180)/Wheelbase*1000
Inches Traveled = Tire Height/sin(20*PI/180)
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