Overview
For stores selling wheels and tires, X-Cart provides a specialized fitment system that goes beyond standard Make/Model/Year compatibility. This is sometimes called the "third kind of fitment" because it adds wheel/tire specification matching on top of regular vehicle fitment.
How it works
Unlike standard fitments (which map products to Make/Model/Year/Submodel combinations), wheel & tire fitment works through attribute-based filtering. The process has two steps:
Step 1: Vehicle selection → Attribute matching
When a customer selects their vehicle, the system looks up that vehicle's wheel/tire specifications (imported from AutoSync). These specs determine which products are compatible:
For wheels
Specification | Description | Example | How It's Used |
Bolt Pattern | Number of bolts × bolt circle diameter (mm) | 6×135 | Must match exactly — if the car has 6 bolts at 135mm spacing, only wheels with 6×135 bolt pattern are shown |
Center Bore | Hub center hole diameter (mm) | 87.1mm | Wheel bore must be ≥ car's bore — a wheel with 87.1mm bore fits a car with 87.1mm rod, but a wheel with 80mm bore would not |
Niche | Vehicle market segment | Truck Ford Lincoln | Wheels must match the vehicle's niche, or have no niche specified (meaning universal) |
Vehicle Type | Vehicle category | Truck, SUV, Car | Additional filter — wheels marked "Truck" won't show for a sedan |
For tires
Specification | Description | Example |
Section Width | Tire width in mm | 265 |
Aspect Ratio | Height-to-width ratio (%) | 70 |
Rim Diameter | Wheel diameter in inches | 17 |
Load Rating | Maximum load capacity index | 121 |
Step 2: Size selection
After the vehicle attributes filter the initial product list, the customer chooses their specific wheel/tire size from the OE fitment options (see below). This applies additional diameter, width, and offset filters.
Technical note: Wheel and tire products are marked as "Regular Product" in the fitment type system (not "Vehicle-Specific"), because their compatibility is determined through product attributes and filters rather than through direct Make/Model/Year/Submodel fitment entries. This can be confusing, but it reflects the attribute-based nature of wheel/tire fitment.
OE Fitment categories
The wheel & tire fitment system organizes specifications into three categories:
Original (OE) Fitment
The factory-installed wheel and tire specifications. These are the exact specs the vehicle came with from the manufacturer.
Optional Fitment
Alternative wheel/tire sizes that the vehicle manufacturer officially supports. These are options that were available from the factory (e.g., a sport package with larger wheels).
Plus Size Fitment
Aftermarket-approved larger wheel/tire combinations. Plus sizing increases wheel diameter while maintaining the same overall tire diameter:
Plus 1 — 1 inch larger wheels (e.g., from 17" to 18")
Plus 2 — 2 inches larger (e.g., from 17" to 19")
Plus 3 — 3 inches larger (e.g., from 17" to 20")
Important: The Plus Size section is collapsed by default on the storefront because these sizes are not recommended by the vehicle manufacturer. Customers can expand it manually if they want to explore aftermarket upgrade options.
Upgrade note: If you are upgrading an existing store to the version that supports Plus Size fitments, you will need to re-import your vehicles from AutoSync to pull in the Plus Size data.
Data source
Wheel and tire fitment data comes from AutoSync, which provides detailed vehicle wheel/tire specifications including:
Bolt circle / bolt pattern
Center bore (front and rear, if different)
Staggered fitment support (different front/rear sizes)
Load ratings and speed ratings
Niche and vehicle type classification
OE, Optional, and Plus Size specifications
Other integrations (WheelPros, ATD, ASAP Network) can also provide wheel/tire product data with the relevant attributes, but the vehicle-side specifications (bolt pattern, bore, OE sizes) primarily come from AutoSync.
Category setup for Wheel & Tire fitment
To enable the wheel/tire fitment flow for a category, configure these settings in the category admin:
"Select Your Vehicle" popup — Set to Enabled. Enables the vehicle selection prompt when a customer enters the category.
"Your Vehicle Fitment Info" block — Set to Enabled. Displays the selected vehicle's specifications.
Wheel & Tire Size filter — Set to:
Tire Size filter — for categories containing tire products,
Wheel Size filter — for categories containing wheel products.
Example:
In X-Cart Admin area, go to Catalog > Categories.
Navigate through the category structure to the category you require (for example, Categories > Wheels & Tires > Wheels) and open the category details.
On the Info tab, scroll down the page.
There you will find the settings you require.
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Customer experience
The full wheel & tire shopping flow:
Customer navigates to a wheel or tire category (e.g., "Truck Wheels")
Pop-up appears: "Select Your Vehicle" — cascading Make → Model → Year → Submodel selector (or pick from My Garage)
First-level filtering applies automatically:
For wheels: bolt pattern, center bore, niche, and vehicle type filters are set based on the selected vehicle
For tires: section width, aspect ratio, and rim diameter filters are set
Products incompatible with the vehicle are hidden immediately
"Select Your Wheel/Tire Size" pop-up appears showing OE fitment options:
Original sizes: factory-installed specifications (e.g., 17×7.5 with offset +44)
Optional sizes: manufacturer-approved alternatives
Plus Size (collapsed by default): aftermarket upgrade sizes — may require vehicle modifications (lift kit, fender trimming, etc.)
Second-level filtering applies: diameter, width, and offset filters are set based on the chosen size
Customer browses filtered results — only wheels/tires compatible with both their vehicle and chosen size are displayed
Can't find answers you're looking for?
Email us at support@x-cart.com. We will be happy to help!
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