Spec Explained: eg. 16X1.5-2.25 AV, E-READY Size 16 X 1.5-2.25 AV E-READY Explanation Diameter Compatible Width Valve Type (and Length) Extra thickness for extra durability and heavy load Unit Inch Inch mm ETRTO: Size ETRTO 26x1.50-1.75 38/45-559 26x1.75-2.35 45/61-559 26x1(3/8) 37-590 Valve Explained: Type Name Length AV American Valve / Schrader Valve 35 mm AV48 American Valve / Schrader Valve 48 mm FV French Valve / Presta Valve 33 mm FV48 French Valve / Presta Valve 48 mm FV60 French Valve / Presta Valve 60 mm FV80 French Valve / Presta Valve 80 mm 因應產品特殊性，所有內胎一經開啟及由原包裝取出後，將不接受退貨及換貨。
