Wheel Bolt Pattern Comparator
Compare wheel bolt patterns by lug count and pitch circle diameter (PCD). Convert mm to inches and check whether two patterns match.
Compare bolt count and pitch diameter.
Wheel Bolt Pattern Comparator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Wheel Bolt Pattern Comparator Works?
The Wheel Bolt Pattern Comparator works by comparing the lug count and the pitch circle diameter (PCD) of the hub and the wheel. The tool uses 3 steps.
Enter the hub pattern
Type the vehicle pattern, for example 5x114.3.
Enter the wheel pattern
Type the wheel pattern, for example 5x4.5 in.
Read the match
The comparator converts 4.5 in to 114.3 mm and returns Match. A 5x112 wheel on a 5x114.3 hub returns No match with a 2.3 mm (0.09 in) PCD gap.
Wheel Bolt Pattern Comparator Formula
The Wheel Bolt Pattern Comparator matches 2 patterns when n_hub = n_wheel and PCD_hub = PCD_wheel. A measured stud spacing converts to PCD with PCD = s ÷ sin(180° ÷ n).
n₁ = n₂ and PCD₁ = PCD₂PCD = s ÷ sin(180° ÷ n)PCD_mm = PCD_in × 25.4- n
- Number of lugs
- PCD
- Pitch circle diameter through stud centers (mm)
- s
- Center-to-center distance between adjacent studs (mm)
Worked example
On a 5-lug hub, adjacent studs measure 67.2 mm (2.65 in) apart. The PCD is 67.2 ÷ sin(36°) = 114.3 mm (4.5 in), so the pattern is 5x114.3.
Wheel Bolt Pattern Comparator Conversion Table
The Wheel Bolt Pattern Comparator conversion table lists 10 common bolt patterns in metric and imperial notation with the adjacent stud spacing used to identify each pattern.
| Metric | Imperial | Adjacent stud spacing | Stud circle radius |
|---|---|---|---|
| 4x100 | 4x3.94" | 70.7 mm | 50.00 mm |
| 4x108 | 4x4.25" | 76.4 mm | 54.00 mm |
| 5x100 | 5x3.94" | 58.8 mm | 50.00 mm |
| 5x108 | 5x4.25" | 63.5 mm | 54.00 mm |
| 5x112 | 5x4.41" | 65.8 mm | 56.00 mm |
| 5x114.3 | 5x4.50" | 67.2 mm | 57.15 mm |
| 5x120 | 5x4.72" | 70.5 mm | 60.00 mm |
| 5x127 | 5x5.00" | 74.6 mm | 63.50 mm |
| 6x139.7 | 6x5.50" | 69.8 mm | 69.85 mm |
| 8x165.1 | 8x6.50" | 63.2 mm | 82.55 mm |
What is Wheel Bolt Pattern Comparator?
A Wheel Bolt Pattern Comparator is a tool that checks whether a wheel's lug pattern matches a vehicle's hub. A bolt pattern has 2 parts: the number of lugs and the pitch circle diameter.
Close patterns do not interchange. A 5x112 wheel on a 5x114.3 hub misses by 2.3 mm, which loads the studs sideways. Wobble bolts and adapters exist for that gap, and each one adds a part to check.
Odd lug counts such as 5 have no stud directly opposite another stud, so PCD is measured from the spacing of adjacent studs or with a pattern gauge.
What are the uses of Wheel Bolt Pattern Comparator?
There are 4 main uses of the Wheel Bolt Pattern Comparator, including used wheel buying and pattern identification.
Used wheel buying
Confirm a used wheel fits before paying.
Pattern identification
Identify an unmarked hub from a stud measurement.
Unit conversion
Translate 5x4.5 in into 5x114.3 mm.
Adapter planning
Find the gap an adapter needs to bridge.
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