Hankook Smart Flex AH51
EU tyre label for every size: 9 sizes of this 3PMSF-marked tyre compared with the rest of the market
The Hankook Smart Flex AH51 is a 3PMSF-marked tyre for trucks and buses. Its supplier has registered it in the EU product database (EPREL) in 9 sizes (28 registrations including load and speed variants), for 22.5″ rims.
Wet grip is rated B–C depending on size, fuel efficiency B–C and external rolling noise 69–72 dB. 27 of 28 registrations carry the three-peak mountain snowflake (3PMSF) for severe snow.
The label depends on the size. Sorted by wet grip, then fuel efficiency, then noise, the best-labelled size on sale is 355/50 R22.5 (Wet grip B · Fuel efficiency B · 70 dB), the weakest 275/70 R22.5 (Wet grip C · Fuel efficiency C · 72 dB).
On the EU market since May 2021; the earliest production week registered is 01/2018.
How it compares in its sizes
We compared each size with all other winter and 3PMSF tyres of the same size and class in EPREL (9 sizes had at least four rivals). A size scores when its label is at least as good as 75% of them.
Strongest point: fuel efficiency.
All 9 sizes
The small figure under each class is the share of same-size, same-season tyres this size matches or beats (“–” when fewer than five tyres share the size).
| Size | Load / speed | Wet | Fuel | Noise | Snow / ice | Production from |
|---|---|---|---|---|---|---|
| 22.5″ rims | ||||||
| 12R22.5C3 | 152/149L | B98% | C100% | 69 dBA99% | 3PMSF | 14/2025 |
| 275/70R22.5C3 | 148/145M · 148/145M | C49% | C93% | 72 dBA59% | 3PMSF | 20/2024 |
| 295/80R22.5C3 | 154/149M · 154/149M · 154/149M | B92% | C93% | 72 dBA75% | 3PMSF | 01/2022 |
| 315/60R22.5C3 | 154/148L · 154/148L · 154/148L | B91% | C79% | 72 dBA74% | 3PMSF | 01/2022 |
| 315/70R22.5C3 | 156/150L · 156/150L · 156/150L | B92% | C84% | 72 dBA80% | 3PMSF | 01/2018 |
| 315/80R22.5C3 | 156/150L (150M) · 156/150L · 156/150L (150M) | B92% | C93% | 72 dBA80% | 3PMSF | 37/2020 |
| 315/80R22.5C3 | 158/150L (150M) | B92% | B99% | 72 dBB80% | 3PMSF | 30/2026 |
| 355/50R22.5C3 | 156K · 156K · 156K | B97% | B95% | 70 dBA95% | 3PMSF | 20/2023 |
| 385/55R22.5C3 | 160/158K (158L) · 160K (L) · 160K (L) | B89% | B94% | 70 dBA94% | 3PMSF | 35/2022 |
| 385/65R22.5C3 | 160K (L) · 160K (L) · 164K · 164K · 164K | B91% | B97% | 70 dBA92% | 3PMSF | 37/2020 |
| 385/65R22.5C3 | 160K (L) | B91% | B97% | 70 dBA92% | — | 01/2026 |
Questions
Is the Hankook Smart Flex AH51 a quiet tyre?
Its declared rolling noise ranges from 69 dB to 72 dB (median 72 dB). In 78% of the sizes we could compare, it is at least as quiet as three quarters of same-size rivals.
How good is the Hankook Smart Flex AH51 in the wet?
Its wet grip class is B–C. In 89% of compared sizes that is at least as good as three quarters of same-size rivals.
Is the Hankook Smart Flex AH51 suitable for snow?
27 of 28 registrations carry the 3PMSF symbol, which means the tyre passed the EU severe-snow test. Check the exact size in the table.
When was the Hankook Smart Flex AH51 launched?
It has been on the EU market since May 2021. The earliest production week in its registrations is 01/2018; the DOT code on the sidewall shows the week and year of your tyre.
More from Hankook
Source: EPREL, the European Commission’s product registry for energy labelling — 28 registrations, data as of 25 October 2026. Suppliers have updated 16 of these registrations since first publication. Label values are the supplier’s declaration.