Three numbers on a sidewall.
Here is the shape they make.
Every size drawn to its real proportions, with what fits in its place, how far the speedometer drifts if you change — and the 736 deaths and 3,163 injuries drivers have reported to federal regulators, size by size.
The sidewall is the part nobody pictures
All three of these are drawn at the same scale. The middle number in a size is a percentage of the width, not a height — which is why a 275 can end up with less rubber between the rim and the road than a 195.
Most complained-about sizes
Ranked by how many complaints US drivers filed. A common size collects more simply by being common — read them against each other.