📖 Overview
Calculate wheel fitment movement by comparing width offset and spacer combinations.
The tool reports outer poke change and inner clearance delta in millimeters.
This makes suspension and fender risk easier to assess before mounting.
Use it to plan clean fitment without relying on guesswork from forum posts.
🧪 Example Scenarios
Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.
| Input | Base Case | Higher Pressure Case |
|---|---|---|
| Current Wheel Width (in) | 8 | 9.2 |
| Current Offset (mm) | 35 | 40.25 |
| New Wheel Width (in) | 9 | 10.35 |
| New Offset (mm) | 28 | 32.2 |
| Spacer Thickness (mm) | 5 | 5.75 |
⚙️ How It Works
This calculator applies a direct math model based on the inputs above.
Quick Reference
| Input | Example Value |
|---|---|
| Current Wheel Width (in) | 8 |
| Current Offset (mm) | 35 |
| New Wheel Width (in) | 9 |
| New Offset (mm) | 28 |
| Spacer Thickness (mm) | 5 |
When To Use This
- Use this tool when you need a fast decision during active planning or execution.
- Use this before committing money, time, or tradeoffs that are hard to reverse.
- Use this to compare options using the same assumptions across scenarios.
Edge Cases To Watch
- Results can be misleading if key inputs are missing, stale, or unrealistic.
- Very small or very large values may amplify rounding effects and interpretation risk.
- If assumptions change mid-decision, recalculate before acting.
Practical Tips
Frequently Asked Questions
❓ Is this output exact?
It is a fast estimate based on provided inputs and model assumptions.
❓ Can I compare different scenarios?
Yes, this tool is designed for quick side-by-side checks.