5x8.75 10x8.75 To 10x285.75 For GM C40, C50, C60, C70, C80 Wheel Adapters
These wheel adapters are designed to install large semi-truck wheels with a bolt pattern of 10x285.75 mm or 10x11.25". If your 10-lug wheels don’t have a notched center bore, these adapters are essential for a hassle-free installation.
Some vehicles are equipped with stud thread pitches of either 5/8" or 11/16". Please select the appropriate size from the options above.
Made to Order: This product is made to order and may take up to 7 business days to ship.
Custom Sizes: Need a custom size or thickness? Call us at (310) 763-1437.
MADE IN THE USA
1.5" Thick is the most common thickness for this conversion.
Features
- Made out of 6061 T-6 aluminum billet bars
- Allows you to put 10x285.75 wheels on your truck
- Compatible with both Alcoa and aftermarket wheels
- Hub and wheel centric, ensuring no vibration even at high speeds
- Engineered for extreme-duty vehicles, safe for heavy-duty towing
- Proven to support towing capacities of up to 36,000 lbs with our adapters
- Includes all necessary mounting hardware
Specifications
- Vehicle Bolt Pattern: Front 5x8.75" | Rear 10x8.75"
- Wheel Bolt Pattern: 10x285.75 MM
- Wheel Bore: 220.1 MM
- Thread Pitch: 22x1.5
- Thickness: Select Above
- Front Wheel Lip: 0.50"
- Rear Wheel Lip: 1.50"
- Material: Billet Aluminum 6061 T-6
- Hardware: 10.9 Grade
- Finish: Raw Aluminum
- Torque Specs: Factory specifications recommended
Vehicle Compatibility
New wheels being installed must have a 10x285.75 MM bolt pattern.
| Year | Make | Model | Bolt Pattern |
|---|---|---|---|
| Old Models | Chevy | GMC | C40, C50, C60, C70, C80 | Front : 5x8.75" |
| Old Models | Chevy | GMC | C40, C50, C60, C70, C80 | Rear: 10x8.75" |
Frequently Asked Questions
What Is the difference between aluminum and steel?
The main distinction between aluminum and steel is the weight, which impacts the rotating mass. Our billet 6061 T-6 aluminum adapters have a tensile strength of 45,000 PSI, compared to 53,700 PSI for steel. However, our billet aluminum adapters are twice as thick as steel ones, resulting in nearly double the combined PSI strength. A 1.5" aluminum adapter weighs approximately 30 lbs, while a 1.5" steel adapter can weigh up to 70 lbs, adding unnecessary rotating mass. For reference, even heavy-duty vehicles like Big Rigs, which carry over 70,000 lbs, are equipped with aluminum wheels. While we offer both steel and aluminum adapters, choosing the right one depends on your comfort level and specific application needs.
Why Is the 1.5" thick adapter the standard size for aluminum?
A 1.5" thickness is the standard choice because thinner adapters would require either notching the wheel or using the reverse stud method, both of which can be complicated. A 1.5" thick adapter eliminates these challenges. With a 222.25mm bolt pattern and a 220.1 mm hub bore, anything less than 1.5" thick won't provide the needed clearance to hide the wheel adapter mounting lug nuts.
What Is the maximum towing capacity?
Our adapters have been rigorously tested for towing capacities up to 36,000 lbs, specifically on a 2022 Ford F-450, which has a towing capacity of 37,000 lbs. The adapters performed flawlessly under the load, with no issues.
Can I purchase replacement studs?
Yes, we offer replacement studs in various lengths if you ever need to replace a damaged one.