Technical Sources & Standards
The primary standards organizations, regulatory agencies, and technical references that define the dimensional models and formulas used on TireCalculator.net.
Primary Standards Organizations
The Tire and Rim Association, Inc. (TRA)
us-tra.org ↗The standardizing body for tire, rim, valve, and allied parts manufacturers in the United States. Referenced for dimensional standards, approved rim widths, measuring rim conventions, and load inflation tables for passenger (P-metric), light truck (LT-metric), and flotation tires.
European Tyre and Rim Technical Organisation (ETRTO)
etrto.org ↗The European authority for pneumatic tires, rims, and valves. Referenced for metric tire geometry (ISO-metric), theoretical rolling circumference conventions, design dimensions, and operational growth boundaries.
National Highway Traffic Safety Administration (NHTSA)
nhtsa.gov/equipment/tires ↗Federal Motor Vehicle Safety Standards (FMVSS) establishing tire labeling, load capacity, and identification requirements for motor vehicles in the United States, referenced where regulatory definitions apply.
International Organization for Standardization (ISO 5751)
iso.org ↗International standard for motorcycle tires and rims (metric series). Referenced for motorcycle tire dimensional designation rules, nominal section widths, aspect ratios, and the standardized M/C rim-contour compatibility requirement.
Secondary Technical References
Manufacturer Load & Inflation Application Manuals
Published technical manuals from tire manufacturers—including the Toyo Tires Tire Replacement Manual, Goodyear Light Truck & RV Load Tables, and Continental Technical Databook—referenced for discrete load-at-pressure lookup steps and replacement sizing guidelines.
Tire Rack Technical Education Resources
tirerack.com ↗Secondary technical articles explaining nominal tire sizing calculations, measuring rim effects, speedometer error dynamics, and manufacturer-published revolutions-per-mile data.
Traction Devices & Winter Equipment Standards
Peerless Industrial Group / Security Chain Company (SCC)
peerlesschain.com ↗Manufacturer application guides, product specifications, and live web database referenced for verified tire-size to product-family (Super Z6, Auto-Trac) part-number mappings, product-specific Class S status claims, published directional operating-clearance specifications, and operating speed limits.
SAE International (SAE J1232)
Standardized clearance classification criteria establishing restricted wheel-well clearance envelopes (commonly referenced as Class S) for passenger cars and light-duty vehicles.
National Association of Chain Manufacturers (NACM)
Technical specifications and safety reference guidelines for welded and weldless chain hardware and traction applications.
Commercial Vehicle Safety Alliance (CVSA) & State DOTs
cvsa.org ↗North American commercial motor vehicle safety criteria and official state departments of transportation (e.g. CDOT, Caltrans, WSDOT, ODOT). Referenced for statutory mountain pass chain mandates, seasonal carry corridors, minimum link dimensions, drive axle chain placements, and trailer drag chain compliance.
Manufacturer Technical Data
When specific vehicle or tire fitment questions arise, individual manufacturer data sheets provide exact rolling revolutions per mile, approved rim width ranges, and maximum inflation pressures. Always verify vehicle-specific requirements against the vehicle manufacturer's tire placard located on the driver-side door jamb.