5×4.75 to mm – Bolt Pattern Conversion Guide
The term 5×4.75 to mm is commonly used in automotive discussions when converting wheel bolt patterns from inches to
The term 5×4.75 to mm is commonly used in automotive discussions when converting wheel bolt patterns from inches to millimeters. The 5×4.75 bolt pattern means there are 5 lug holes and the distance between opposite lug holes is 4.75 inches.
To understand how this fits with metric measurements and which vehicles it works with, this guide explains all the essential details in simple words.
What Is 5×4.75 in mm?
To convert 4.75 inches to millimeters, multiply by 25.4, because one inch equals 25.4 millimeters.
4.75 inches x 25.4 = 120.65 mm
So, the 5×4.75 bolt pattern equals 5×120.65 mm. In many car manuals and wheel specifications, this may be written as:
5×120.65 mm
5 on 120.65
5×4.75″ (inch format)
This means the wheel has five bolt holes, and the diameter of the bolt circle is 120.65 millimeters.
Why Convert 5×4.75 to mm?
Most older American cars use inches, while many modern vehicles and wheels use millimeters. If you’re shopping for wheels, spacers, or adapters online, knowing both formats helps avoid mistakes.
Reasons to convert:
- Matching aftermarket wheels
- Checking fitment for wheel spacers or adapters
- Finding compatible vehicles
- Importing/exporting wheels across countries
- Understanding technical documents or catalogs
Common Vehicles with 5×4.75 (5×120.65 mm) Bolt Pattern
This bolt pattern is very common among classic American cars, especially from Chevrolet and GM (General Motors). Here are some examples:
Classic Cars
- Chevrolet Bel Air
- Chevrolet Camaro (1967–1981)
- Chevrolet Chevelle
- Chevrolet Corvette (up to 1982)
- Chevrolet El Camino
- Chevrolet Impala
- Chevrolet Nova
- Pontiac Firebird
- Pontiac GTO
- Oldsmobile Cutlass
- Buick Regal (RWD models)
These vehicles often came with wheels that use the 5×4.75 bolt circle. When replacing with aftermarket or modern wheels, knowing the mm equivalent ensures you get the perfect fit.
5×4.75 vs 5×120 – Are They the Same?
No, 5×4.75 (120.65 mm) and 5×120 mm are not exactly the same, even though they are very close. The difference is only 0.65 mm, but that gap can matter depending on the hub-centric vs lug-centric fitment of your wheels.
- Hub-centric wheels center on the hub, so exact match is important.
- Lug-centric wheels center using the lugs, allowing for a small difference.
Some people use 5×120 wheels on 5×120.65 vehicles, especially with lug-centric spacers or adapters. But it’s not ideal without proper checking.
Can You Use 5×120 Wheels on a 5×4.75 Vehicle?
Yes, sometimes, but it depends on how the wheel is mounted. The difference between 120 mm and 120.65 mm may sound small, but it can affect the:
- Bolt hole alignment
- Wheel stud stress
- Vibration during driving
To make them work safely:
- Use conversion adapters
- Choose lug-centric wheels
- Avoid in racing or high-speed use
For everyday street driving, many car enthusiasts use 5×120 wheels on 5×4.75 cars by using conversion adapters or resizing lugs, but always measure carefully.
Measuring the 5×4.75 Bolt Pattern
If you’re not sure of your bolt pattern, measure it. Here’s how:
For 5-Lug Wheels:
- Choose one lug hole.
- Measure from the center of that lug to the furthest lug hole center, skipping one lug.
The result for 5×4.75 should be 4.75 inches, or 120.65 mm.
Make sure you’re using accurate tools. It’s best to use digital calipers or a bolt pattern gauge.
Wheels and Accessories for 5×4.75 Bolt Pattern
If you’re looking for accessories or replacements, these are some parts that usually match the 5×120.65 mm (5×4.75) pattern:
- Custom alloy rims
- Wheel spacers and adapters
- Hub rings
- Center caps
- Lug nuts and bolts
- Disc brake kits (with matching rotor pattern)
When buying, double-check the specifications and confirm with the seller or a fitment guide.
Converting to Other Bolt Patterns
Sometimes car owners want to change from 5×4.75 to a more common metric size, like 5×120 mm, or vice versa. Here’s how:
Use Wheel Adapters:
Adapters bolt onto your existing studs and provide a new bolt pattern on the outside.
Example:
- Convert 5×4.75 (120.65 mm) to 5×120
- Convert 5×4.75 to 5×114.3
- Convert 5×4.75 to 5×5 (127 mm)
Adapters come in thicknesses ranging from 15mm to 50mm. Always check for proper torque settings and thread engagement.
Importance of Proper Fitment
Using the wrong bolt pattern or mismatched parts can lead to:
- Unsafe wheel fit
- Loose or broken studs
- Uneven tire wear
- Vibration and noise
- Suspension damage
Always verify:
- Bolt pattern
- Hub bore size
- Offset (ET value)
- Wheel width and diameter
- Stud size and thread pitch
A safe fit depends on matching all these specs, not just bolt pattern.
Popular Wheel Brands Offering 5×4.75 Fitments
Many aftermarket wheel manufacturers offer options for this bolt pattern. Some top brands include:
- American Racing
- Cragar
- Vision Wheels
- Weld Racing
- US Mags
- Ridler
- Wheel Vintiques
- Rocket Racing Wheels
These brands design for muscle cars, hot rods, and classic trucks—many of which use the 5×4.75 pattern.
Summary of 5×4.75 to mm
Here is a simple breakdown:
| Format | Value |
|---|---|
| Inch Format | 5×4.75″ |
| Metric Format | 5×120.65 mm |
| Lug Count | 5 |
| Circle Diameter | 120.65 mm |
This bolt pattern is most common on classic GM cars, especially older Chevrolets and Pontiacs. If you’re working on such a vehicle, or buying wheels, spacers, or adapters, use the 120.65 mm format when needed for international or metric-based brands.
