Cadillac STS tire and wheel sizes
The Cadillac STS was approved in Switzerland between 2005 and 2010 with tires from 255/45R17 to 275/40R19 on 17″, 18″, 19″ wheels. The most common sizes are 255/45R18, 235/50R17, 255/45R17. Some versions use different sizes front and rear (staggered fitment).
Sizes differ by engine, trim and market. Confirm with the tire placard (usually on the driver's door jamb), the owner's manual or the vehicle registration papers before buying tires or wheels.
Most common sizes
Cadillac STS (2005–2010) type GMX295
11 approved versions, e.g. STS 4.6-V8Aut.AWD, STS 3.6 - V6 Aut., STS 4.6 - V8 Aut., STS-V 4.4-V8 Aut..
| Tire size | Axle | Load / speed | Rim and offset | Versions |
|---|---|---|---|---|
| 235/50R17 | Front | 95V | 7.5Jx17 ET51 | 11 |
| 255/45R17 | Rear | 98V | 8Jx17 ET51 | 11 |
| 255/45R18 | Front & rear | 99Y | 8Jx18 ET51, 8.5Jx18 ET42/51 | 11 |
| 235/50R18 | Front | 97W | 8Jx18 ET51 | 11 |
| 255/45R18 | Front | 99Y | 8.5Jx18 ET51 | 7 |
| 255/45R18 | Rear | 99W | 8Jx18 ET51 | 11 |
| 275/40R19 | Rear | 101Y | 9.5Jx19 ET56 | 7 |
How to read this table
Rim and offset uses the European notation: 7Jx17 ET45 is a 7-inch wide, 17-inch diameter wheel with a 45 mm offset. "Versions" is how many approved versions list that size — a rough guide to how common it is. Load / speed is the most frequent service description (for example 91V) among them; your car may require a higher one.
Showing 11 of 11 approvals: rare special versions are left out to keep the page readable. Records were read from the German-language text and checked against the French text; 100 % matched exactly.
Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.