1998 Pontiac Grand Prix Bolt Pattern & Tire Size
The 1998 Pontiac Grand Prix OEM tire size, bolt pattern, and wheel specifications are listed below. All data is based on industry-standard OEM reference specifications.
The 1998 Pontiac Grand Prix has a 5x115 bolt pattern, an OEM tire size of 225/60R16, and a 70.3mm center bore.
Other years of the Pontiac Grand Prix
1998 Pontiac Grand Prix Engine & Trim Levels
Detailed tire and wheel breakdown for the 1998 Pontiac Grand Prix
Tire geometry â 225/60R16
The 225/60R16 fitted to the 1998 Pontiac Grand Prix has a section width of 225mm and an aspect ratio of 60%, mounted on a 16-inch rim. That gives a sidewall height of 135.0mm (5.31") and an overall outside diameter of 676.4mm (26.63"). At highway speed this tire completes roughly 471 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 1998 Pontiac Grand Prix while keeping the speedometer accurate, target a 235/52R17 (plus-one). For a softer ride or winter setup, a 215/69R15 (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 1998 Pontiac Grand Prix uses a 5x115 bolt pattern with a 70.3mm hub bore. Safe rim width range for the OEM tire is 6.0J â 7.0J, and offsets in the ET37 â ET47 window will clear suspension and fender without rubbing on most setups.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 1998 Pontiac Grand Prix 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 1998 Pontiac Grand Prix GTP use?
The 1998 Pontiac Grand Prix GTP uses 225/60R16 tires as standard equipment.
What is the bolt pattern of the 1998 Pontiac Grand Prix?
The 1998 Pontiac Grand Prix has a 5x115 bolt pattern with a center bore of 70.3mm.
What is the wheel offset of the 1998 Pontiac Grand Prix?
The 1998 Pontiac Grand Prix has a wheel offset of ET42.
Other Vehicles with 5x115 Bolt Pattern
The following vehicles share the same 5x115 bolt pattern as the 1998 Pontiac Grand Prix, making wheel interchangeability possible (verify offset and center bore before swapping).