What is the bolt pattern on a 1963 Chevy Impala?
The 1963 Chevrolet Impala uses a 5-lug bolt pattern on 4.75 inches (5x4.75).
Bolt pattern specifics
The essential mounting specifications you’ll need to match wheels or adapters for the 1963 Impala are listed below.
- Bolt pattern: 5 on 4.75 inches (5x4.75 in, 120.65 mm circle)
- Center bore: 2.75 inches (69.9 mm)
- Lug nut size: typically 1/2-20 UNF
- General compatibility: shared across most GM passenger cars of the mid-1960s
With these numbers in hand, you can assess whether a wheel model will seat properly and center correctly on the hub.
Measuring and verifying on your car
If you're unsure or dealing with a non-stock setup, verify the bolt pattern on your specific vehicle before buying wheels. This helps prevent misfits and potential safety issues.
Step-by-step check
Here are practical steps to confirm the bolt pattern on your Impala:
- Count the lug holes: five evenly spaced around the hub.
- Measure the bolt circle diameter by drawing a circle through the centers of opposite lug holes; you should see about 4.75 inches (120.65 mm).
- Check the center bore: typical for this era is about 2.75 inches (69.85 mm).
If you’re mounting aftermarket wheels with a different hub bore or offset, consider hub-centric rings or adapters to maintain proper alignment and safety.
Compatibility notes and modernization considerations
The 5x4.75 pattern is common not only on the Impala but across many GM makes from the same period. When upgrading to modern wheels, you may encounter different center bores or offsets, making adapters or new hubs necessary. Always verify backspacing, offset, and load rating before committing to a wheel change.
Bottom line: for a 1963 Chevy Impala, plan around a 5x4.75 bolt pattern, a 2.75-inch center bore, and standard GM lug hardware to ensure proper fitment and safety.
Summary: The 1963 Impala uses a 5-on-4.75-inch bolt pattern, with a 2.75-inch center bore and typical 1/2-20 lug nuts. This pattern was standard for GM mid-1960s passenger cars, guiding wheel choices for restoration and upgrades alike.
