2009 Chevrolet Corvette Base
The 2009 Chevrolet Corvette Base tire size and wheel specifications below reflect standard OEM reference fitment data for this trim level.
Detailed tire and wheel breakdown for the 2009 Chevrolet Corvette
Tire geometry â 245/40R18
The 245/40R18 fitted to the 2009 Chevrolet Corvette has a section width of 245mm and an aspect ratio of 40%, mounted on a 18-inch rim. That gives a sidewall height of 98.0mm (3.86") and an overall outside diameter of 653.2mm (25.72"). At highway speed this tire completes roughly 487 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 2009 Chevrolet Corvette while keeping the speedometer accurate, target a 255/33R19 (plus-one). For a softer ride or winter setup, a 235/47R17 (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 2009 Chevrolet Corvette uses a 5x120.65 bolt pattern with a 70.3mm hub bore. Safe rim width range for the OEM tire is 8.0J â 9.0J, and offsets in the ET51 â ET61 window will clear suspension and fender without rubbing on most setups.
Staggered setup notes
The 2009 Chevrolet Corvette ships staggered: 245/40R18 up front and 285/35R19 on the rear. That is a 285mm vs 245mm width difference â do not rotate front-to-rear, and replace tires in axle pairs to keep ABS and traction control balanced.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 2009 Chevrolet Corvette 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) |
|---|---|---|---|
| Base | 245/40R18 Rear: 285/35R19 | 18" x 8.5 | ET56 |
Frequently Asked Questions
What tire size does the 2009 Chevrolet Corvette Base use?
The 2009 Chevrolet Corvette Base uses 245/40R18 tires as standard equipment.
What is the bolt pattern of the 2009 Chevrolet Corvette Base?
The 2009 Chevrolet Corvette Base has a 5x120.65 bolt pattern with a center bore of 70.3mm.
What is the wheel offset of the 2009 Chevrolet Corvette Base?
The 2009 Chevrolet Corvette Base has a wheel offset of ETET56.