D&D Global 1245K9 Micro-V Serpentine Belt - K Section, 9 Ribs, 1245mm 5VX so a T20US belt runs

so a T20US belt runs only on T20US pulleys

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Pitch Profile 8M Pitch 8 mm Tooth Profile Modified Curved (GT) Tooth Location Single Side Number of Teeth 180 Width 36mm Length 1440 mm Material Polyurethane Reinforcement Carbon Cord Color White/Gray Temperature Range -20°F to 158°F

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Is 20/3V580 the same as other brands' 20/3V580

D&D Global 1245K9 Micro-V Serpentine Belt - K Section, 9 Ribs, 1245mm 5VX so a T20US belt runsThe D&D Global 1245K9 is a Micro V (multi ribbed) belt with Micro V ribbed K section dimensions, manufactured by D&D Global. Micro V belts deliver smooth, quiet operation with high power capacity in a compact cross section, ideal for serpentine and multi accessory drive systems. Constructed with Neoprene body compound and aramid (kevlar) tensile members for reliable power transmission and long service life. Specifications Belt Section K Belt Type