TireMath Fit Guide
TireMath Fit Guide
An offline-first tire fitment workbench that lets car owners, off-roaders, and tuners compare tire sizes, calculate speedometer error, analyze wheel offset and backspacing, save vehicle profiles, and export a printable spec sheet.
About TireMath Fit Guide
An offline-first tire fitment workbench that lets car owners, off-roaders, and tuners compare tire sizes, calculate speedometer error, analyze wheel offset and backspacing, save vehicle profiles, and export a printable spec sheet.
Screenshots
TireMath Fit Guide on iPhone and iPad.
Highlights
Size Converter: enter metric (225/45R17) or flot…
Size Converter: enter metric (225/45R17) or flotation (33x12.5R15) tire sizes and instantly see diameter, sidewall height, circumference, revolutions per mile, and section width with millimeter/inch toggle.
Speedometer Error Engine: input current and targ…
Speedometer Error Engine: input current and target tire sizes plus a reference speed to get the exact speedometer vs. actual speed difference and the corrected speedometer reading.
Offset & Backspace Analyzer: set wheel width, of…
Offset & Backspace Analyzer: set wheel width, offset, and optional spacer thickness to compute backspacing and visualize how the wheel face shifts inward or outward from the hub.
3-Column Compare: pin three tire/wheel setups si…
3-Column Compare: pin three tire/wheel setups side by side and compare diameter, width, circumference, clearance delta, and speedometer error in a single scrollable matrix.
Vehicle Garage: save named vehicles with OEM tir…
Vehicle Garage: save named vehicles with OEM tire size, target reference speed, and notes; revisit or edit any saved setup later entirely offline.
Visual Fit Checker: view a simple car silhouette…
Visual Fit Checker: view a simple car silhouette with overlay lines showing ride-height change and wheel-track shift compared to stock, with both stock and new tire outlines.
Privacy first
TireMath Fit Guide does not collect personal data — everything stays on your device, with no third-party tracking or advertising SDKs. Read the full Privacy Policy.
Support
Questions or feedback? Visit Support or email carpenter.seo@88international.link.