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How do I read a tire sidewall code like 205/55R16 91W?

Read it in order: 205 is section width in millimeters, 55 is the aspect ratio (sidewall height as a percent of width), R means radial, and 16 is the wheel diameter in inches. The trailing 91W is the load index (91 maps to a set maximum load) and speed rating (W is 168 mph). Matching or exceeding your factory load index and speed rating keeps a heavier or faster JDM car within spec.

Next: plan the move

Found the car. Understand the handover.

Before making promises about collection, coordinate the inspection, paperwork, seller release and transport. Give each part of the purchase its own check.