To choose tires for a Prius, go to Toyota.com, and click the Owners link located in the upper right portion of the Web page. Choose your Prius model, and click the Go button. Hover your cursor over the Parts and Service link, and select Genuine Toyota Parts.
Scroll to the bottom of the Web page, and click the Tires image. Enter your ZIP code in the search field, and press Enter. Visit any of the approved retailers listed on the search results page to choose new tires for your Prius. Alternatively, read the tire size and tread on the tire's sidewall or on the driver's side door threshold. The tire specifications printed on the driver's door threshold include the width, aspect ratio and diameter of the correct tire size. Choose new tires that match these specifications.