Decision Tools & Data

A PCD filter is a fast way to shrink a donor-wheel list. It is not a fitment verdict. PCD–pitch circle diameter–describes the diameter of the circle passing through the wheel’s bol...

A donor wheel is suitable for a target vehicle only if it clears the vehicle’s mechanical constraints and provides acceptable geometry for the intended tire and use. Compare the tw...

Define the decision before comparing numbers A wheel comparison should answer a specific question: does this wheel meet the vehicle’s basic mounting requirements, and is its geomet...

A compatibility database is a shortlist, not a purchase guarantee. Before ordering a wheel, turn each listed donor into a set of checks you can verify against your vehicle, the whe...

A forum statement such as “these wheels fit” is a useful lead, not a fitment decision. The claim may refer to a different brake package, tire size, suspension setup, or even a whee...

Metric and inch bolt-pattern listings often describe the same nominal PCD in different units. They can also make different patterns look interchangeable after rounding. Before buyi...

Define the decision you need to make Comparing two tire sizes by overall diameter answers one specific question: How much will the tire’s nominal outside diameter change from one s...

Backspacing can be converted to offset, but only if the wheel width and measurement basis are known. The basic calculation is straightforward; the fitment decision is not. Offset d...

Define the decision before trusting the listing A “fits many cars” claim is not proof of fitment. It may mean only that the wheel has a common bolt pattern, or that the seller has ...

Seller-provided wheel specifications are useful only if they are complete, internally consistent, and matched to the correct vehicle fitment requirements. Before treating a listing...