Guides
What the numbers on a sidewall and a wheel actually mean, worked from geometry. No vehicle lookups, no invented specifications.
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Fitment notes, October 17, 2026
5x114.3 vs 5x115: Why 0.7 mm Makes Them Different
5x114.3 vs 5x115 compared from geometry: the 0.35 mm error at every stud, what it does to a tapered lug seat, and how to tell which pattern you have.
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Guides, October 17, 2026
Bolt Pattern Guide: How to Measure 4, 5, 6 and 8 Lug
A bolt pattern guide from first principles: what PCD means, how to measure 4-, 5-, 6- and 8-lug hubs, and why a near-match like 5x114.3 is unsafe.
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Guides, October 17, 2026
Tire Size Meaning: Every Number and Letter Explained
Tire size meaning, field by field: service type, width, aspect ratio, construction, rim, load index and speed rating, with cited reference tables.
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Guides, October 17, 2026
Wheel Offset vs Backspacing: One Measurement, Two Ends
Wheel offset vs backspacing explained with the conversion formula, why a width is always required, and how each one changes inner and outer clearance.