Belt Length and Pulley Speed

V-belt length, driven RPM, and belt speed from pulley diameters and centers.

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Formula and source

V-belt length L = 2C + (π/2)(D + d) + (D − d)² / (4C). Driven RPM via diameter ratio. Belt speed (fpm) = π × D × RPM / 12.

Gates / Goodyear / Bando manufacturer drive-design manuals by name.

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