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Mechanical & Drives

Pulley size for a required speed

Driven pulley diameter needed for a target speed.

rpm
rpm
mm

Calculating…

How it's calculated

D2 = D1 × n1 ÷ n2

Use pitch diameters for V-belt pulleys. If the driven pulley comes out very large, a smaller driver pulley may be possible, but keep it above the belt maker's minimum diameter for the belt section.