Decoding TWG Wheel Part Numbers
Wheel part numbers stack six fields into one string — brand, diameter, width, bolt pattern, finish, and offset — built around the example 8015-2937M18.
Format Breakdown:
A wheel number packs six fields into 8015-2937M18, in this order.
1. Brand - A single character
2. Diameter - 1 or more digits
3. (dash)
4. Width - Usually 1 digit, sometimes 2 for a half-inch size
5. Bolt Pattern Code - Always 2 digits (except 101/102 for 4-lug SXS fitments) - Look it upon the Bolt Pattern Codes tab
6. Finish Code - 1–4 letters
7. Offset - Optional, 2 digits (3 for dually wheels)
Brand, width, and finish are all variable-length, so don’t assume a fixed number of characters per field — read the diagram below alongside the tables, and when a specific SKU’s split looks ambiguous, confirm it against the product record rather than guessing