Micro-V AT® Belts Listed by NumberListed by Number. Showing Belt Numbers with Corresponding. Nominal Outside Lengths, Top Widths and Angles. Belt. Length. Length Top Width Top Width.GATES Belt size, length, width for GATES belts by part number.GATES BELTS SIZES - Length and Width ; 36, 1210, 21 ; 37, 1220, 22 ; 38, 1230, 23 ; 39, 1240, 24 ; 40, 1245, 24.5 
564853d1440696792-belts-gates-belt-chart-number.pdfMicro-V® Belts. Listed by Number. Showing Our Belt Numbers with Corresponding. Nominal Outside Lengths, Top Widths and Angles. Our. Length. Top Width.Automotive Micro-V Belts - GatesAUTOMOTIVE MICRO-V BELTS ; Outside Circumference (in). 20 -- 21.7 (4); 21.7 -- 23.4 (4) ; Outside Circumference (mm). 508 -- 561.2 (4); 561.2 -- 614.4 (8)