# CarSpecsHQ

> Tire size dimensions (inches and mm), equivalent sizes within ±3%, plus/minus sizing and speedometer error for 1113 US tire sizes and 3275 size pairs. Computed from the size code with standard geometry: sidewall = width × aspect/100; diameter = rim + 2 × sidewall; revs/mile = 63,360 ÷ (π × diameter).

- [All sizes as JSON](https://carspecshq.com/api/sizes.json)
- [Tire size calculator](https://carspecshq.com/tire-size-calculator/)
- [Metric ↔ inch chart](https://carspecshq.com/tire-size-conversion/)
- Size pages: https://carspecshq.com/tire-size/<width>-<aspect>r<rim>/ (e.g. https://carspecshq.com/tire-size/265-70r17/)
- Comparison pages: https://carspecshq.com/compare/<size-a>-vs-<size-b>/ (smaller diameter first)
- [13" wheels](https://carspecshq.com/rim/13-inch/)
- [14" wheels](https://carspecshq.com/rim/14-inch/)
- [15" wheels](https://carspecshq.com/rim/15-inch/)
- [16" wheels](https://carspecshq.com/rim/16-inch/)
- [16.5" wheels](https://carspecshq.com/rim/16.5-inch/)
- [17" wheels](https://carspecshq.com/rim/17-inch/)
- [17.5" wheels](https://carspecshq.com/rim/17.5-inch/)
- [18" wheels](https://carspecshq.com/rim/18-inch/)
- [19" wheels](https://carspecshq.com/rim/19-inch/)
- [19.5" wheels](https://carspecshq.com/rim/19.5-inch/)
- [20" wheels](https://carspecshq.com/rim/20-inch/)
- [21" wheels](https://carspecshq.com/rim/21-inch/)
- [22" wheels](https://carspecshq.com/rim/22-inch/)
- [23" wheels](https://carspecshq.com/rim/23-inch/)
- [24" wheels](https://carspecshq.com/rim/24-inch/)
- [26" wheels](https://carspecshq.com/rim/26-inch/)