How We Verify Wheel Fitment Data

This page explains where the bolt pattern, center bore and wheel size figures on ankusiwheels.com come from, how we check them, and how we correct mistakes. It covers the vehicle fitment guides, the open wheel fitment dataset, the bolt pattern statistics and the fitment API.

What we publish

Each vehicle fitment guide lists up to four kinds of data:

• Hub data: bolt pattern (PCD), center bore and lug thread. These are factual specifications of the vehicle.
• Factory wheel sizes: the original equipment (OE) wheel diameter, width and offset (ET) for the model and year.
• Flush and maximum references: aftermarket sizes we suggest as starting points. These are engineering estimates, not factory data, and are labelled as references.
• Derived numbers: backspacing and poke, calculated from width and offset with the formula backspacing = width / 2 + offset / 25.4 + 0.5 in (flange allowance).

The two-source rule

A bolt pattern, center bore or factory offset is published or changed only when two independent sources agree. Independent means the two sources do not copy from each other. Mirror sites of the same database count as one source.

Sources we use, roughly in order of preference:

1. Manufacturer documents and official press materials, when they state wheel specifications.
2. Established fitment databases, checked model by model and year by year, for example Wheel-Size.com and avtoreference.com.
3. Specialist fitment references from wheel and parts suppliers, and owner-club technical pages.
4. Owner forum measurements, used only as a third vote to break a tie.

When sources disagree, we do not pick one. The page keeps its current value, the conflict is logged internally, and we look for a third source before changing anything.

Values that differ by 0.1 mm

Some center bores are published as either 71.5 or 71.6 mm, 66.5 or 66.6 mm, or 95.1 or 95.2 mm, depending on the source and how it rounds. We treat these as the same bore. When ordering hub rings or a hub-centric wheel, measure your hub or ask us to confirm.

New and low-volume models

Newly launched models, especially Chinese-market cars, often have only one published source for a few months. Every vehicle guide now shows a data-check line near the specifications: it says whether the bolt pattern and center bore have been confirmed by two independent sources, or are still waiting for a second source. If a guide says it is waiting, measure your hub before ordering. If you own one of these cars and can measure the hub, we would like to hear from you.

How corrections work

1. Anyone can report an error to info@ankusi.com. Please include the vehicle, year and the source or measurement you are relying on.
2. We check the report against two independent sources.
3. If the correction is confirmed, we update every language version of the page and the dataset, and record the change in the dataset changelog with the date and the sources used.
4. The original value is kept in our backups, so any change can be reviewed later.

Versions and the open dataset

The dataset is rebuilt from the live fitment guides and published with a version number. Each release is mirrored on figshare and Zenodo with a permanent DOI, so a paper or article can cite the exact version it used. The data is released under CC BY 4.0.

Limits you should know about

• Fitment data describes the vehicle as built. Aftermarket brakes, suspension and body kits change what fits.
• Factory wheel sizes can vary by trim, market and option package. Check the exact model year and trim.
• Flush and maximum references are starting points. Always test-fit or measure before you order a wheel.

ANKUSI Wheels is a forged wheel manufacturer in Guangzhou, China. We maintain this data because we use it every day to build wheels to order, and we publish it openly so drivers, shops and researchers can use it too.

Source: How ANKUSI Verifies Wheel Fitment Data (ankusiwheels.com)

ANKUSI Wheels. (2026). How ANKUSI Verifies Wheel Fitment Data. Retrieved October 13, 2026, from https://ankusiwheels.com/wheel-data-methodology/

@misc{ankusi2026wheeldatam,
  author = {{ANKUSI Wheels}},
  title = {How ANKUSI Verifies Wheel Fitment Data},
  year = {2026},
  howpublished = {\url{https://ankusiwheels.com/wheel-data-methodology/}},
  note = {Accessed October 13, 2026}
}

<a href="https://ankusiwheels.com/wheel-data-methodology/">How ANKUSI Verifies Wheel Fitment Data</a> (ANKUSI Wheels)