There are a lot of bikes designed for 650c/571 mm tires, but until recently, only very narrow widths have been available in this size. The Terry Tellus is the first 650c tire offered in a 28mm width. The Tellus PT improves on the original Tellus by adding PT protection technology which provides a nearly impenetrable layer of tire protection -- three times more puncture resistance than a Kevlar belted tire of the same approximate weight. - Max inflation pressure: 107 psi - Weight: 317.5g (11.2-ounce) - ETRTO: 28-571