Automotive
PCD Fitment
Convert bolt patterns, analyze wheel fitment, and avoid dangerous mismatches.
A professional PCD calculator for converting bolt patterns, matching aftermarket wheels, measuring stud distances, and performing full fitment analysis with hub ring, offset, and vibration risk checks.
What It's Great For
Common scenarios where PCD Fitment shines
Checking aftermarket wheels
Verify that a set of aftermarket wheels will fit your car without adapters, hub rings, or clearance issues before you buy.
Measuring bolt pattern from a hub
Physically measure the distance between wheel studs and let the app compute the PCD and identify the correct bolt pattern.
Converting between metric and imperial
Quickly convert a 5x114.3 bolt pattern to its inch equivalent (5x4.5) or vice-versa for cross-region part sourcing.
Selecting the right hub rings
Determine if your aftermarket wheels need hub-centric rings and calculate the exact inner/outer diameters required.
Avoiding vibration risks
Get a vibration risk score based on PCD delta, adapter thickness, and stud count before mounting a near-match wheel.
Features
What PCD Fitment can do for you
Flexible Pattern Parsing
Accepts bolt patterns in formats like 5x114.3, 5x4.5, and 5 4 1/2, automatically detecting units.
Instant Conversion
Convert PCD between millimeters and inches with a single input, including exact, near-match, and incompatible classification.
Physical Measurement Wizard
Enter a stud-to-stud distance and lug count; the engine calculates PCD and identifies the closest known pattern with confidence scoring.
Full Fitment Analysis
Select a vehicle, enter aftermarket wheel specs, and get a report: pattern match, hub ring requirement, adapter analysis, offset/backspacing, and vibration risk.
Built-in Vehicle Database
Browse factory bolt patterns, center bores, torque specs, and lug seat types for hundreds of vehicles.
Hub Ring & Offset Tools
Calculate required hub-centric ring dimensions and convert between offset (ET) and backspacing.
All Features
- Pattern parsing from free-text input
- Automatic metric-imperial conversion
- Near-match detection with ambiguity warnings
- Hub ring calculator
- Offset to backspacing converter
- Adapter thickness and safety analysis
- Vibration risk scoring
- Vehicle database with factory specs
- Measurement wizard for physical studs
- Demo datasets for quick learning
- History of recent conversions
- Export results as CSV
- Garage profiles for saved vehicles
Integrate
Connect programmatically via the public API or MCP server
https://pcdfitment.codecide.net/api Use this base URL for API requests.
Interactive API Docs →https://pcdfitment.codecide.net/mcp Add this URL to your MCP client (Claude, Cursor, etc.)
View MCP docs →Professional services
Made to fit.
If PCD Fitment is almost what you need, we can close the gap. Branding, data, integrations, infrastructure, or deeper customizations.
No commitment. We'll figure out what makes sense.
PCD Fitment is free to use under the MIT license.
PCD Fitment is provided for estimation and educational purposes only. We make no warranty about the accuracy, completeness, or fitness of its results. Always verify outputs before applying them to designs, decisions, or safety-critical work.