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 (typically 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 |
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.
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.
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.
Viewing vehicle fitment data (Admin area)
Each imported vehicle has a Vehicle Info page where you can see all its imported wheel & tire fitment data:
Go to Catalog > Vehicles & Fitments > Find Vehicle.
Search for the vehicle and click through to its Submodel.
Open the Vehicle Info tab.
The page shows:
General — Vehicle Type (e.g., Truck).
Configurations — Body Type & Number of Doors, BedType & Length [inch] (the same additional fitment selectors described in Additional fitment selectors (Part 3)).
Wheel Data — Lug Count, Bolt Circle, Bore.
Tire Data — Tire Vehicle Type Tag, Load Rating.
Fitments — one table per fitment category this vehicle actually has data for (OE Sizes, Optional Sizes, Plus Sizes). Each table lists Rim, Tire, Offset, and Offset range for every matching size.
Example: for a 2015 CHEVROLET Silverado 2500 HD High Country, the OE Sizes table lists two rows — 18"x8" wheels with 275/70R18 tires (Offset 50 mm, Offset range 20-45 mm), and 17"x7.5" wheels with 245/70R17 tires (Offset 50 mm, Offset range 20-50 mm).
Note: Not every vehicle has data for all three fitment categories — this example vehicle has OE Sizes and Plus Sizes, but no Optional Sizes.
Category setup for Wheel & Tire fitment
To enable the wheel/tire fitment flow for a category, configure the following settings on that category's Info tab in the Admin area:
"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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Verifying the CloudSearch&Filters filters used by wheel & tire fitment
The vehicle-based filtering described above (Step 1 and Step 2) relies on a fixed set of Cloud Search & Filters (CS&F) attribute filters. These are created automatically when the Wheel & Tire Fitment add-on is set up, so in most cases you don’t need to configure anything — but if fitment filtering isn’t narrowing down products as expected, check that all of the following filters exist in Store > Search & Filters > Filters and are enabled:
Filter | Tag | Used for |
Lug Count | Wheels | Wheel fitment (Step 1) |
Bolt Circle [mm] | Wheels | Wheel fitment (Step 1) |
Bore [mm] | Wheels | Wheel fitment (Step 1) |
Niche | Wheels | Wheel fitment (Step 1) |
Vehicle Type | Wheels, Tires | Wheel and tire fitment (Step 1) |
Offset [mm] | Wheels | Wheel fitment (Step 1) and size selection (Step 2) |
Diameter [inch] | Wheels, Tires | Wheel size selection (Step 2) |
Width [inch] | Wheels | Wheel size selection (Step 2) |
Section Width [mm] | Tires | Tire fitment (Step 1) |
Aspect Ratio | Tires | Tire fitment (Step 1) |
Rim Diameter [inch] | Tires | Tire fitment (Step 1) |
If a filter is missing, renamed, or disabled, the corresponding matching step is silently skipped — the storefront won’t show an error, it just won’t narrow down products by that attribute.
Bore [mm] and Offset [mm] may need one additional manual step: by default, they use the Checkboxes display mode, which can list dozens of individual values. For a cleaner customer experience, set Display mode to Range for these two filters — this shows them as a min–max slider instead of a long checkbox list. See Additional fitment selectors (Part 3) for more on filter display modes.
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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