RTI (Ramp Travel Index) Calculator





 

Introduction

The Ramp Travel Index (RTI) is a measurement that quantifies a vehicle’s ability to flex its suspension while maintaining tire contact with the ground on uneven terrain. Essentially, it tells you how well your vehicle can handle obstacles such as rocks, tree roots, and steep inclines without lifting its wheels off the ground. A higher RTI score indicates superior off-road capability.

Formula:

The RTI is calculated using a straightforward formula:

RTI = (Rear wheel height raised / Wheelbase) x 100

Where:

  • Rear wheel height raised: This is the height the rear wheel reaches when the vehicle is driven up a ramp until one of its wheels starts to lift off the ground.
  • Wheelbase: The distance between the centers of the front and rear wheels of the vehicle.

How to Use?

Using an RTI Calculator is relatively simple:

  1. Find a suitable testing location: Look for a safe and controlled environment with a ramp or incline. Ensure the area is free from obstacles and hazards.
  2. Measure the rear wheel height raised: Drive the vehicle up the ramp or incline until one of the rear wheels begins to lift off the ground. Measure the height of the raised wheel from the ground.
  3. Measure the wheelbase: Measure the distance between the centers of the front and rear wheels of the vehicle.
  4. Input the data: In the RTI calculator, input the measured rear wheel height raised and the vehicle’s wheelbase.
  5. Calculate RTI: The calculator will provide you with the Ramp Travel Index score, expressed as a percentage.
  6. Interpret the results: A higher RTI score indicates better off-road capability. It means your vehicle can maintain contact with the ground on steeper inclines and over larger obstacles.

Example:

Let’s illustrate the concept of RTI with an example:

Suppose you have a Jeep Wrangler with a rear wheel height raised of 28 inches and a wheelbase of 95 inches.

Using the RTI formula:

RTI = (28 / 95) x 100 RTI = 29.47 (rounded to the nearest hundredth)

So, in this example, your Jeep Wrangler has an RTI score of approximately 29.47%.

FAQs?

Q1: What is a good RTI score?

A1: A good RTI score depends on your off-roading needs and preferences. Generally, an RTI score above 50% is considered excellent, indicating exceptional off-road capability.

Q2: Can you improve your vehicle’s RTI score?

A2: Yes, you can enhance your vehicle’s RTI score by modifying its suspension, adding larger tires, and using other off-road accessories.

Q3: Are there limitations to using RTI as a measure of off-road capability?

A3: Yes, RTI provides a useful benchmark, but it doesn’t account for other factors like approach and departure angles, ground clearance, and the driver’s skill. It’s best used in conjunction with other off-road metrics.

Conclusion:

The RTI (Ramp Travel Index) Calculator is an essential tool for off-road enthusiasts and professionals looking to evaluate a vehicle’s performance on rugged terrain accurately. By measuring how well your vehicle can flex its suspension while maintaining tire contact with the ground, you can make informed decisions about its off-road capabilities. Keep in mind that while RTI is a valuable metric, it should be considered alongside other factors like ground clearance, approach and departure angles, and driver skill to ensure a safe and enjoyable off-roading experience.

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