255/35R21 is a tire size notation. It describes geometry but does not establish the load, speed, tire class, wheel approval or fit of a particular replacement.
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How to read this size
- Nominal width: 255 mm
- Aspect ratio: 35 %
- Wheel diameter: 21.0 in
- Calculated nominal diameter: 711.9 mm
Calculated nominal diameter is an arithmetic estimate from the size code; actual product measurements vary.
Before ordering tires
Read the driver-door tire placard. Match the installed wheel, axle, tire class, load index, speed rating and any OE marking. The size alone cannot approve a replacement SKU. Tire-sidewall maximum pressure is not your vehicle’s cold inflation pressure.
Vehicles recorded with this size
| Model year and vehicle | Trim / option | Axle | Service |
|---|---|---|---|
| 2025 Tesla Model Y | 2025+ refreshed 21-inch configuration | front | Not documented |
Exact product variants in research
| Tire line | Manufacturer part number | Service |
|---|---|---|
| Hankook iON evo AS | 1033169 | 98W |
Explore 255/35R21 tires on Amazon
Amazon search results may mix tire classes, load and speed ratings, OE markings and package quantities. Match the full requirement on your actual vehicle before ordering.
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Search 255/35R21 tires on AmazonCompare sizes with the tire size calculator. It is an educational geometry comparison, not a fitment ruling.
Sources and scope
- Tesla — Model Y 2025+ US service manual — Replacement Tire Information (checked 2026-11-01)
- Hankook Tire America — iON evo AS US size specifications (checked 2026-11-01)
- Tesla — Model Y Wheels and Tires — live North America manual (checked 2026-11-01)
Research checked November 2, 2026. A source-observed size is not final product fitment. Confirm the actual vehicle and current manufacturer guidance.