2017 Opel Astra Ultimate
The 2017 Opel Astra Ultimate tire size and wheel specifications below reflect standard OEM reference fitment data for this trim level.
Detailed tire and wheel breakdown for the 2017 Opel Astra
Tire geometry â 225/40R18
The 225/40R18 fitted to the 2017 Opel Astra has a section width of 225mm and an aspect ratio of 40%, mounted on a 18-inch rim. That gives a sidewall height of 90.0mm (3.54") and an overall outside diameter of 637.2mm (25.09"). At highway speed this tire completes roughly 500 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 2017 Opel Astra while keeping the speedometer accurate, target a 235/33R19 (plus-one). For a softer ride or winter setup, a 215/48R17 (minus-one) keeps the overall diameter within Âą3% of stock, which is the industry tolerance for ABS and stability control to stay calibrated.
Wheel fitment specs
The 2017 Opel Astra uses a 5x105 bolt pattern with a 56.6mm hub bore. Safe rim width range for the OEM tire is 7.0J â 8.0J, and offsets in the ET39 â ET49 window will clear suspension and fender without rubbing on most setups.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 2017 Opel Astra is printed on the driver-side door jamb sticker â always defer to that value, not to the maximum pressure printed on the tire sidewall. Check pressure monthly and before long trips; under-inflation by 20% can reduce tread life by 25%.
Fitment Specifications
| Engine & Trim | Tire Size | Rim Size | Offset (ET) |
|---|---|---|---|
| Ultimate | 225/40R18 | 18" x 7.5 | ET44 |
Frequently Asked Questions
What tire size does the 2017 Opel Astra Ultimate use?
The 2017 Opel Astra Ultimate uses 225/40R18 tires as standard equipment.
What is the bolt pattern of the 2017 Opel Astra Ultimate?
The 2017 Opel Astra Ultimate has a 5x105 bolt pattern with a center bore of 56.6mm.
What is the wheel offset of the 2017 Opel Astra Ultimate?
The 2017 Opel Astra Ultimate has a wheel offset of ETET44.