2025 Buick Regal Bolt Pattern & Tire Size
The 2025 Buick Regal OEM tire size, bolt pattern, and wheel specifications are listed below. All data is based on industry-standard OEM reference specifications.
The 2025 Buick Regal has a 5x115 bolt pattern, an OEM tire size of 235/50R18, and a 70.3mm center bore.
Other years of the Buick Regal
2025 Buick Regal Engine & Trim Levels
Detailed tire and wheel breakdown for the 2025 Buick Regal
Tire geometry â 235/50R18
The 235/50R18 fitted to the 2025 Buick Regal has a section width of 235mm and an aspect ratio of 50%, mounted on a 18-inch rim. That gives a sidewall height of 117.5mm (4.63") and an overall outside diameter of 692.2mm (27.25"). At highway speed this tire completes roughly 460 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 2025 Buick Regal while keeping the speedometer accurate, target a 245/43R19 (plus-one). For a softer ride or winter setup, a 225/58R17 (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 2025 Buick Regal uses a 5x115 bolt pattern with a 70.3mm hub bore. Safe rim width range for the OEM tire is 7.5J â 8.5J, and offsets in the ET35 â ET45 window will clear suspension and fender without rubbing on most setups.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 2025 Buick Regal 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%.
OEM Wheel & Tire Specs
Frequently Asked Questions
What tire size does the 2025 Buick Regal TourX use?
The 2025 Buick Regal TourX uses 235/50R18 tires as standard equipment.
What is the bolt pattern of the 2025 Buick Regal?
The 2025 Buick Regal has a 5x115 bolt pattern with a center bore of 70.3mm.
What is the wheel offset of the 2025 Buick Regal?
The 2025 Buick Regal has a wheel offset of ET40.
Other Vehicles with 5x115 Bolt Pattern
The following vehicles share the same 5x115 bolt pattern as the 2025 Buick Regal, making wheel interchangeability possible (verify offset and center bore before swapping).