1. What is Portal Gear Ratio?

Portal gear ratio refers to the gear reduction provided by portal axle gearboxes. SuperATV portals are aftermarket gear reduction systems that increase ground clearance and torque.

2. How Does the Calculator Work?

The calculator uses the portal ratio formula:

Where:

• Vehicle Gear Ratio — Your vehicle's stock or modified gear ratio
• Portal Ratio — The reduction ratio of your portal gearboxes (typically 1.6:1, 2.0:1, etc.)

Explanation: The portal gearboxes multiply your vehicle's existing gear ratio, increasing torque and reducing speed at each wheel.

3. Importance of Portal Gear Ratio

Details: Understanding your final drive ratio helps predict performance changes, select proper tires, and maintain appropriate gearing for your application.

4. Using the Calculator

Tips: Enter your vehicle's gear ratio and your portal gear ratio. Common portal ratios are 1.6:1 or 2.0:1 for SuperATV systems.

5. Frequently Asked Questions (FAQ)

Q1: What are typical portal gear ratios?
A: SuperATV offers 1.6:1 and 2.0:1 ratios, with other manufacturers offering different options.

Q2: How does portal ratio affect performance?
A: Higher ratios increase torque and crawling ability but reduce top speed. Lower ratios offer less reduction for faster applications.

Q3: Can I combine portals with gear reduction?
A: Yes, portals multiply your existing gear ratio, so they work with stock or re-geared differentials.

Q4: How does ratio affect tire size?
A: Higher ratios can compensate for larger tires by maintaining similar final drive ratios to stock.

Q5: What's the best ratio for my application?
A: Depends on your vehicle, tire size, and intended use. Rock crawlers typically prefer higher ratios than trail riders.