Metalcloak IQ: RTI & CTI Calculator / Converter
RTI & CTI Calculator
Calculate Ramp Travel Index and Corner Travel Index scores
Essential tool for measuring and comparing suspension articulation
inches
ramp incline
inches up ramp
auto-fills wheelbase
RTI Score
0
Ramp Travel Index
Tire Height
0in
Vertical tire height
Flex Rating
Average
Suspension performance
Est. CTI Score
0
Equivalent CTI rating
RTI Ramp Visualization
Performance Analysis
Ramp Angle:
20°
Travel vs Wheelbase:
0%
Suspension Quality:
Good
measurement type
vertical clearance (in)
vertical clearance (in)
vertical clearance (in)
vertical clearance (in)
CTI Score
0
Corner Travel Index
Total Clearance
0in
Sum of tire clearances
CTI Rating
Average
Suspension performance
Est. RTI Equivalent
0
Approximate RTI score
CTI Lift Platform Visualization
CTI Performance Analysis
Method Used:
Four Wheel (Certified)
Average Clearance:
0 in
Suspension Balance:
Good
conversion type
measured RTI
inches up ramp
RTI test angle
Estimated CTI
0
Converted score
Tire Height
0in
Off ground elevation
Travel Distance
0in
Up ramp distance
Conversion Quality
Good
Estimate accuracy
Conversion Visualization
Conversion Analysis
Method:
RTI → CTI
Geometric Relationship:
Height = Distance × sin(angle)
Accuracy Note:
Estimate - actual testing preferred
RTI & CTI Score Guidelines
| RTI Score Range | CTI Equivalent | Suspension Quality | Typical Vehicles |
|---|---|---|---|
| 800+ | 1600+ | Exceptional | Highly modified rock crawlers |
| 600-800 | 1200-1600 | Excellent | Long-arm suspension, coilovers |
| 400-600 | 800-1200 | Good | Quality lift kits, good shocks |
| 250-400 | 500-800 | Average | Basic lift kits, stock plus |
| 150-250 | 300-500 | Poor | Stock or budget modifications |
| Under 150 | Under 300 | Very Poor | Stock vehicles, worn suspension |
Understanding RTI vs CTI
RTI (Ramp Travel Index):
- Formula: RTI = (Travel Distance ÷ Wheelbase) × 1000
- Standard Angle: 20-30 degree ramps depending on event
- Measurement: Distance up ramp until rear tire lifts
- Focus: Articulation and suspension travel
- Range: Typically 100-1000+ points
CTI (Corner Travel Index):
- Formula: CTI = (FPT + RDT + FDT + RPT) × 10 (Four Wheel Method)
- Alternative: CTI = (FPT + RDT) × 10 × 2 (Two Wheel Estimated)
- How Measured: Lift platforms raise opposite corners simultaneously
- Measurement: Vertical clearance from ground to lowest point of lifted tire
- Standard: All tires set to 15 psi for consistent measurement
- Focus: Maximum suspension flex capability at all four corners
- Range: Typically 400-1300+ points
- More Information: What is Corner Travel Index?
CTI vs RTI Key Differences:
- Setup: CTI uses flat lift platforms, RTI uses angled ramps
- Driver Skill: CTI eliminates driver skill as a factor
- Tire Pressure: CTI standardizes at 15 psi, RTI varies
- Wheelbase: CTI is wheelbase-independent, RTI is affected by wheelbase
- Safety: CTI keeps vehicle level and balanced
- Consistency: CTI provides more repeatable measurements
- Calculation: CTI uses simple addition/multiplication
Important Notes:
- Safety First: Always use proper safety equipment when testing
- Ramp Construction: Ensure ramp is stable and properly angled
- Vehicle Limits: Don't exceed safe suspension travel limits
- Measurement Accuracy: Use precise measuring tools for best results
- Comparison: Only compare scores from same ramp angle
- Estimation: CTI conversions are estimates, actual testing preferred