CST AD-R9
EU tyre label for every size: 19 sizes of this summer tyre compared with the rest of the market
The CST AD-R9 is a summer tyre for passenger cars. Its supplier has registered it in the EU product database (EPREL) in 19 sizes (34 registrations including load and speed variants), for 18″ to 20″ rims.
Wet grip is rated A in every size, fuel efficiency C and external rolling noise 71–72 dB.
On the EU market since January 2020; the earliest production week registered is 01/2020.
How it compares in its sizes
We compared each size with all other summer tyres of the same size and class in EPREL (19 sizes had at least four rivals). A size scores when its label is at least as good as 75% of them.
Strongest point: wet grip.
What the label means on the road (225/40ZR18)
Example: the 225/40ZR18 size, compared with the 528 other summer tyres registered in this size.
Wet braking from 80 km/h
≈34 m with class A, against ≈37 m for the most common class in this size (B).
Fuel efficiency
Class C, the most common class in this size: no difference to the typical tyre.
Rolling noise
71 dB against a median of 71 dB in this size.
Estimates from the class ranges in Regulation (EU) 2020/740. A label class is a range, so a real tyre can sit anywhere inside it. Every 3 dB doubles the sound energy.
All 19 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 |
|---|---|---|---|---|---|---|
| 18″ rims | ||||||
| 215/40ZR18 | 89Y XL | A100% | C94% | 71 dBB67% | — | 01/2020 |
| 225/40ZR18 | 92W RF · 92Y RF · 92Y RF | A100% | C92% | 71 dBB75% | — | 01/2020 |
| 225/45ZR18 | 95W RF · 95Y RF · 95Y RF | A100% | C90% | 71 dBB76% | — | 01/2020 |
| 235/45ZR18 | 98W RF · 98Y RF · 98Y RF | A100% | C83% | 71 dBB75% | — | 01/2020 |
| 245/35 R18 | 92Y RF | A100% | C97% | 71 dBB77% | — | 01/2024 |
| 245/40ZR18 | 97W XL | A100% | C89% | 71 dBB78% | — | 01/2020 |
| 245/40ZR18 | 97Y RF · 97Y RF | A100% | C89% | 71 dBB78% | — | 01/2020 |
| 245/45ZR18 | 100W RF · 100Y RF · 100Y RF | A100% | C88% | 71 dBB78% | — | 01/2020 |
| 245/50ZR18 | 104Y RF · 104Y RF | A100% | C89% | 71 dBB72% | — | 01/2020 |
| 19″ rims | ||||||
| 225/40ZR19 | 93Y XL | A100% | C91% | 71 dBB70% | — | 01/2020 |
| 225/45ZR19 | 92W · 96Y RF | A100% | C84% | 71 dBB67% | — | 01/2020 |
| 235/35R19 | 91Y RF | A100% | C92% | 71 dBB64% | — | 01/2020 |
| 245/40ZR19 | 98Y RF · 98Y RF | A100% | C88% | 71 dBB78% | — | 01/2020 |
| 245/45ZR19 | 102Y RF · 104Y RF | A100% | C84% | 71 dBB75% | — | 01/2020 |
| 255/35R19 | 96Y RF | A100% | C83% | 72 dBB63% | — | 01/2020 |
| 255/40ZR19 | 100Y RF · 100Y RF | A100% | C88% | 71 dBB87% | — | 01/2020 |
| 20″ rims | ||||||
| 245/40ZR20 | 99Y XL | A100% | C87% | 71 dBB75% | — | 01/2020 |
| 255/35R20 | 97Y RF | A100% | C89% | 72 dBB70% | — | 01/2020 |
| 255/40R20 | 101Y RF | A100% | C37% | 72 dBB52% | — | 01/2020 |
| 275/35R20 | 102Y RF | A100% | C74% | 72 dBB70% | — | 01/2020 |
Best-labelled summer tyres in 225/40ZR18
Other tyres on sale in the same size, sorted by wet grip, then noise, then fuel efficiency.
All tyres in 225/40 ZR18, ranked by label →
- Petlas Prestige SportA C 68 dB
- Starmaxx Dynamix SportA C 68 dB
- Pirelli PzeroA D 68 dB
- Sailun Atrezzo ZSR2A B 69 dB
- Rauffan Avantar R7A C 69 dB
- Sicuro Velos Sport S5A C 69 dB
Questions
Is the CST AD-R9 a quiet tyre?
Its declared rolling noise ranges from 71 dB to 72 dB (median 71 dB). In 42% of the sizes we could compare, it is at least as quiet as three quarters of same-size rivals.
How good is the CST AD-R9 in the wet?
Its wet grip class is A. In 100% of compared sizes that is at least as good as three quarters of same-size rivals.
Is the CST AD-R9 suitable for snow?
No size carries the 3PMSF symbol, so it is not certified for severe snow. In countries with winter tyre rules it does not count as a winter tyre.
When was the CST AD-R9 launched?
It has been on the EU market since January 2020. The earliest production week in its registrations is 01/2020; the DOT code on the sidewall shows the week and year of your tyre.
More from CST
Source: EPREL, the European Commission’s product registry for energy labelling — 34 registrations, data as of 23 October 2026. Suppliers have updated 19 of these registrations since first publication. Label values are the supplier’s declaration.