Tbh, most people get it wrong. Tire codes in the usa like 205/55r17 96R pack a ton of info into a small space. Sure, most people can match those, but knowing w

Tbh, most people get it wrong. Tire codes in the usa like 205/55r17 96R pack a ton of info into a small space. Sure, most people can match those, but knowing which you can adjust is helpful. 205 is the approx width of the tread in mm 55 is the height of the tire, expressed as a ratio reletive to the width r usually meant Radial type tire, but has just become part of the standard notation iirc. 17 is the inner diameter in Inches 96 is the Load rating expressed as non linearly scaling variable, needing a chart,in this case 1565lbs. R is the speed rating, which is usually, but not always in alphabetical order due to weird grandfathered codes. In this case, it means the tire is safe to speeds up to 106mph. While not hard, it is complex. You can run a taller(sometimes) or shorter(usually) sidewall, or wider(often) or narrower(almost always) tread (within reason), but you can not under rate the load, use a different inner diameter, or signifigantly slower speed rating.