Last updated: September 13, 2026
FitmentCompass is built to help drivers research tire sizes, wheel specifications, vehicle fitment, compatibility, and related automotive information with greater clarity.
This page explains how we research, review, calculate, organize, and update the information published on FitmentCompass.
Our Editorial Approach
Our goal is to make technical tire and wheel information easier to understand without oversimplifying important fitment details.
We focus on practical questions drivers commonly have, including factory tire sizes, alternative tire sizes, wheel dimensions, bolt patterns, offsets, backspacing, tire pressure, speedometer differences, and general vehicle compatibility.
We aim to separate factual specifications, calculated results, editorial interpretation, and product recommendations so readers can understand what each type of information represents.
How We Research Fitment Information
When researching tire, wheel, and vehicle fitment information, we may consult multiple sources depending on the topic and availability of reliable data.
Sources may include:
- Vehicle manufacturer specifications and owner’s manuals.
- Tire and wheel manufacturer documentation.
- Official product specifications and technical data.
- Retailer and distributor fitment information.
- Published vehicle specification databases.
- Industry standards and commonly accepted tire and wheel formulas.
- Other reputable automotive reference sources when primary information is unavailable.
When possible, we prefer manufacturer or other primary-source information for important specifications. When information differs between sources, we may compare multiple references before publishing or updating a page.
Vehicle Fitment Can Vary
Vehicle fitment is not always determined by year, make, and model alone. Different trims and configurations can use different tires, wheels, brakes, suspension components, and factory options.
Factors that may affect fitment include:
- Model year
- Make and model
- Trim level
- Engine and drivetrain
- Brake package
- Factory wheel package
- Suspension configuration
- Regional or market differences
- Aftermarket modifications
For this reason, FitmentCompass information should be used as a research resource rather than as a substitute for final compatibility verification.
How Our Calculators Work
FitmentCompass calculators use established mathematical formulas to compare tire dimensions and related measurements.
Depending on the tool, calculated values may include tire diameter, sidewall height, circumference, revolutions per mile, width differences, speedometer changes, and other measurements.
Calculator results may be rounded for readability. Small differences can therefore occur when compared with manufacturer-published measurements, which may also vary based on tire construction, wheel width, inflation pressure, load, and measurement methods.
A mathematical comparison does not by itself confirm that a tire or wheel will physically fit a particular vehicle.
Research-Based Content and Hands-On Testing
Not every product or fitment guide on FitmentCompass is based on hands-on testing.
When content is created through research, we may evaluate manufacturer specifications, technical documentation, product features, compatibility information, warranty details, retailer information, and other relevant sources.
We do not claim that we personally tested, installed, drove with, or physically inspected a product unless that actually occurred.
If hands-on testing is performed in the future, we aim to describe what was tested and how the evaluation was conducted.
Product Comparisons and Recommendations
When FitmentCompass compares or recommends tires, wheels, tools, accessories, or other products, we aim to evaluate factors that are relevant to the intended use rather than relying on a single specification or retailer ranking.
Depending on the product category, factors may include:
- Manufacturer specifications
- Vehicle compatibility
- Construction and materials
- Performance characteristics
- Load and speed ratings where applicable
- Warranty coverage
- Available sizes and configurations
- Ease of installation or use
- Price and overall value
- Verified customer feedback when useful
The importance of each factor can vary by product type and intended use.
Affiliate Relationships and Editorial Independence
FitmentCompass may earn commissions from qualifying purchases made through affiliate links.
Affiliate availability does not determine the factual tire, wheel, or vehicle specifications we publish. We aim to keep editorial decisions separate from affiliate compensation.
A product does not automatically receive a recommendation simply because an affiliate program is available, and the presence of an affiliate link should not be interpreted as a guarantee of fitment or suitability.
How We Handle Conflicting Information
Automotive specifications are sometimes reported differently across manufacturers, retailers, databases, and other sources.
When we identify conflicting information, we may review additional sources, prioritize primary documentation where available, and avoid presenting uncertain information as definitive.
Some fitment questions cannot be resolved accurately without inspecting the exact vehicle configuration. In those cases, we may recommend additional verification rather than presenting an unsupported conclusion.
Corrections and Updates
Vehicle specifications, product information, retailer listings, and available fitment data can change over time. We may review and update existing pages when newer or more reliable information becomes available.
If we discover a meaningful factual error, we aim to correct it as soon as reasonably practical.
Readers can report possible errors through our Contact page. When submitting a fitment correction, including the vehicle year, make, model, trim, relevant specification, and page URL can help us investigate the issue.
Safety and Final Verification
Tire and wheel fitment can affect vehicle safety, braking, handling, load capacity, clearance, and other important characteristics.
Before purchasing or installing tires, wheels, spacers, suspension components, or related parts, confirm critical specifications with the vehicle manufacturer, product manufacturer, retailer, or a qualified tire and wheel professional.
Important items to verify may include tire size, load rating, speed rating, wheel width, wheel diameter, bolt pattern, center bore, offset, brake clearance, suspension clearance, and recommended tire pressure.
Our Commitment to Useful Information
Our aim is not simply to publish large amounts of specification data. We want FitmentCompass to help readers understand what the numbers mean, how different specifications relate to one another, and which details require additional verification.
As the site grows, we expect to continue improving our research methods, calculators, fitment resources, and editorial standards.