The 26 x 1.75 size is the normal I.S.O. 559 mm size used on most mountain bikes; the 26 x 1 3/4 (I.S.O. 571 mm) is not interchangeable with any normal tire of similar width, although its bead circumference is the same as the “650C” size used on some high performance 26″ wheel bicycles. Sometime… Continue reading No hands: The rise and fall of the Schwinn Bicycles Company: an American institution, Judith Crown & Glenn Coleman, Henry Holt&Co This is my personal blog