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2027 Corvette Grand Sport X Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Corvette Grand Sport X wheels? This page gives the 2027 Corvette Grand Sport X bolt pattern (5x120), centre bore, factory rim size and the offset range for aftermarket and forged Corvette Grand Sport X rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2027 Corvette Grand Sport X uses a 5x120 bolt pattern with a 66.9 mm centre bore and M12x1.5 lug nuts. Factory wheels: F 20x10.0J ET40 / R 21x13.0J ET50. For aftermarket wheels, 20x10.5J ET35 front / 21x13.5J ET45 rear sits flush and 21x10.5J ET30 front / 22x13.5J ET40 rear is the most aggressive fit.
Forged wheels for the 2027 Corvette Grand Sport X — drilled 5x120 with a 66.9 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Corvette Grand Sport X (2027): 5x120 bolt pattern, 66.9mm center bore. Factory wheels: F 20x10.0J ET40 / R 21x13.0J ET50. Reference fitment ranges.
Bolt Pattern5x120
Wheel Bolt/NutM12x1.5 Nut
Center Bore66.9mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2027
Category5-Lug Coupe/Convertible
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 25, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F 20x10.0J ET40 / R 21x13.0J ET50 |
| Flush Fitment | F 20x10.5J ET35 / R 21x13.5J ET45 |
| Maximum Aggressive | F 21x10.5J ET30 / R 22x13.5J ET40 |
Forged Wheel Designs for the Corvette Grand Sport X
Every design below is forged to order, so it can be machined to the Corvette Grand Sport X's 5x120 bolt pattern and 66.9 mm center bore, with the width and offset calculated for your setup.
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How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
Coupes and performance platforms are where rotational mass shows up fastest — in acceleration, in braking, and in how quickly the chassis changes direction. Forging lets us build to the same strength spec as the factory wheel at a meaningfully lower rotational weight, which is where the performance gain actually comes from, not just the visual one.
The Corvette Grand Sport X runs a 5x120 bolt pattern, 66.9mm center bore, and a F 20x10.0J ET40 / R 21x13.0J ET50 wheel from the factory. Our Flush Fitment reference is F 20x10.5J ET35 / R 21x13.5J ET45, which tucks the tire under the fender lip on a stock-height Corvette Grand Sport X. Our Maximum Aggressive reference is F 21x10.5J ET30 / R 22x13.5J ET40 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Chevrolet Corvette Grand Sport X OE Wheel Specs
The 2027 Chevrolet Corvette Grand Sport X (Coupe/Convertible) uses a 5x120 bolt pattern with a 66.9mm center bore. Factory wheels are F 20x10.0J ET40 / R 21x13.0J ET50.
Why the factory spec works for most owners:
- Keeps unsprung weight low to preserve the factory handling balance
- Matches the wider, performance-oriented tire sizing typical of this platform
- Maintains clearance for the factory brake package and suspension geometry
- Balances grip with ride comfort for daily and spirited driving
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Corvette Grand Sport X (2027) we drill the 5x120 pattern and cut the centre bore to 66.9mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Offset and Backspacing: Factory Wheel vs Options
Backspacing ≈ width/2 + ET/25.4 + 0.5 in. "Inward" means closer to the suspension; "outward" means closer to the fender lip.
| Setup | Size | ET | Backspacing | Inward vs OE | Outward vs OE |
|---|---|---|---|---|---|
| Factory (OE) | 20x10J | ET40 | 7.07 in (180 mm) | — | — |
| Flush | 20x10.5J | ET35 | 7.13 in (181 mm) | +1 mm | +11 mm |
| Maximum | 21x10.5J | ET30 | 6.93 in (176 mm) | −4 mm | +16 mm |
Vehicles With the Same Hub as the Corvette Grand Sport X (5x120, 66.9 mm Bore)
In our database, 161 other vehicle entries from 10 makes use exactly the same 5x120 bolt pattern and 66.9 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
5x120 is used by 10.3% of the vehicle pages in our English fitment guide (670 of 6,503); 24.2% of those also use a 66.9 mm center bore.
Hub-Centric Rings for a 66.9 mm Center Bore
A wheel with a center bore larger than 66.9 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 67.1 mm | 67.1 → 66.9 mm |
| 70.1 mm | 70.1 → 66.9 mm |
| 70.5 mm | 70.5 → 66.9 mm |
| 71.6 mm | 71.6 → 66.9 mm |
| 73.1 mm | 73.1 → 66.9 mm |
ANKUSI forged wheels are bored to exactly 66.9 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Corvette Grand Sport X use?
The 2027 Corvette Grand Sport X uses a 5x120 bolt pattern.
How many lug bolts does the Corvette Grand Sport X use?
The Corvette Grand Sport X uses a 5-lug bolt pattern (5x120), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Corvette Grand Sport X?
The Corvette Grand Sport X's center bore is 66.9mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Corvette Grand Sport X?
Factory wheels on the Corvette Grand Sport X are F 20x10.0J ET40 / R 21x13.0J ET50.
What is the biggest wheel size I can fit on my Corvette Grand Sport X without rubbing?
The most aggressive fitment we recommend without fender work is F 21x10.5J ET30 / R 22x13.5J ET40. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Corvette Grand Sport X?
For a flush look with minimal to no rubbing, we recommend F 20x10.5J ET35 / R 21x13.5J ET45 as a starting point on a stock or mildly lowered Corvette Grand Sport X.
Do I need wheel spacers for my Corvette Grand Sport X?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Corvette Grand Sport X?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 7.13" backspacing up front and 9.02" in the rear.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Corvette Grand Sport X?
Yes — the Corvette Grand Sport X's factory and our recommended flush/max fitments already use staggered sizing (different width front and rear), and ANKUSI can forge matching staggered sets to your target offsets.
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M12x1.5, conical-seat lug nut.
Factory Torque Spec: 136 Nm (100 ft-lb). Covers most Chevrolet passenger cars and crossovers on M12 studs.
TPMS: TPMS (Tire Pressure Monitoring System) has been federally mandated on all new light vehicles sold in the US since the 2008 model year. If your wheels use OE-style sensors, have them transferred or cloned to the new wheels at installation.
Tire Pressure: Always set tire pressure to the value on your vehicle's tire placard (driver's doorjamb or glovebox), not the max PSI printed on the tire sidewall — this is trim- and tire-size-specific and stays the same reference point when you switch to a different wheel and tire combination.
Reference data compiled from published OEM service specifications and cross-checked against independent repair sources; always confirm against your owner's manual or door-jamb placard before installation.
Sources and Last Update
Data checked against: avtoreference.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 20x10 wheels · 20 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.