Applicable scope: Global; verify your exact vehicle and local requirements.
Two tires with similar-looking size markings are not automatically suitable substitutes. Width, aspect ratio and rim diameter are part of the designation, while load capacity, speed category, construction and any vehicle-specific approval may matter as much. The correct fitment decision should begin with the vehicle’s original configuration and manufacturer-approved alternatives, not an online assertion that a wheel ‘bolts on’.
Identify the complete original specification
Read the vehicle’s placard, handbook and the existing tire markings, then corroborate them with a professional supplier. If the car has staggered front/rear wheels or different sizes by trim or market, record each position separately. NHTSA describes tire labeling and load capacity and has advised that replacement tires should provide at least the load-carrying capacity specified for the original vehicle application. Do not use that statement to infer that two particular part numbers are interchangeable.
Ask the questions that an online listing misses
Will the replacement meet the relevant load and speed requirements? Does the vehicle require a specific reinforced or run-flat type? Does the proposed wheel size keep appropriate clearance and speedometer behavior? Could the change affect stability or inspection legality? Those answers may require manufacturer documentation and a qualified tire specialist. A tire photograph or seller’s fitment list alone is insufficient proof.
When the tire itself is the problem
NHTSA lists physical damage, irregular wear and advanced age among reasons for concern. A bulge, major cut, repeated pressure loss or exposed cords deserves professional evaluation without continued normal use. Minimum legal tread depths vary by jurisdiction; passing an inspection limit is not the same as ideal wet-weather performance. Keep the invoice with full brand, model, size, load and speed designation so the next owner can understand exactly what was fitted.
A practical ownership decision
If the tire shop proposes a substitute, ask for the full designation in writing before installation rather than just the trade name. The supplier’s recommendation should state the actual vehicle configuration used for the lookup. A receipt containing only ‘four new tires’ is weak evidence for the next owner, insurer or inspector reviewing what was installed.
Safety and verification
This is ownership information, not a vehicle-specific diagnosis, repair authorization or parts compatibility determination. Confirm the exact model, market, service publication and current local rules. For brakes, steering, structural damage, airbags, high-voltage equipment or other safety-critical concerns, use qualified professionals and follow manufacturer emergency instructions.