Schwinn 700c X 28mm Comfort/Hybrid Tire With Kevlar Tire dimensions: 700c X 38mm which equals 28" X 1-1/2" Traction pattern suited for road and trail riding Built-in flat resistant layer for greater on/off road protection Ultra durable steel bead construction The tire diameter is 700c which equates to 28 inches.The tire width is 38mm which equates to 1-1/2".