Speed Selector designs and manufactures mechanical variable speed pulleys, sheaves, and accessories in the USA. They offer a wide range of standard drive packages and custom-designed pulleys with a capacity up to 125 HP and a 10:1 output speed ratio. Speed Selector specializes in producing pulleys that outlast competitor brands with proprietary coatings, including aluminum pulleys that outlast cast-iron alternatives. They provide instant shipment of in-stock pulleys and crossovers, with a commitment to quick turnaround times for custom parts and prototype components. Additionally, they offer customer support through phone contact and email.