What does 195/65R15 mean?
Decode 195/65R15: section width, aspect ratio, radial construction, rim inches, and approximate overall diameter for upgrade planning.
Decode 195/65R15
195 is nominal section width in millimeters. 65 is the aspect ratio: sidewall height is 65% of 195 mm (about 126.8 mm per side here). R means radial construction. 15 is rim diameter in inches.
Estimated overall diameter
Using the standard geometric model, overall diameter is roughly 634.5 mm. Compare this label to any candidate in the tire size calculator to see diameter and speedometer deltas before you buy.
Common misunderstandings
- The middle number is not sidewall millimeters—it is a percent of width.
- Rim inches are not the tire’s overall height.
- Printed sizes are nominal; molds vary slightly by brand.
Related resources
Read how to read tire size numbers or jump to the FAQ library for deeper articles.
Frequently asked questions
What is 65 in 195/65R15?
What rim fits 195/65R15?
How do I compare 195/65R15 to another tire?
Try the free tire size calculator
Open the interactive tire size calculator to compare diameters, see a wheel size comparison side by side, and review a speedometer difference table before you buy tires or wheels. It works like a quick tire fitment checker for geometry—not a substitute for a professional install bay.