Tire Size Compare - TreadSizer

TreadSizer draws two tire sizes on top of each other, so you see at a glance whether a new size fits and how far your speedometer will drift.

Open the app and a comparison is already on screen. Tap size A or B, pick width, aspect ratio and rim, and the result updates.

FEATURES
• Two tires drawn to scale, one over the other
• Diameter difference in mm, inches and percent
• Speedometer error at a chosen speed
• Green, amber or red guideline band
• Garage to save your cars and size pairs
• Share the result as text

FREE AND PRO
Free: the first comparison, the headline numbers, one new size comparison a day and one saved car.
Pro (one-time purchase): unlimited comparisons, wheel offset and width section view, full detail and speedometer tables, unlimited Garage, image export, unit switching.

Results are a guideline based on the metric tire designation. Check with a tire professional before you buy.