The best replacement for pulley is sheave.

The best alternatives to pulley are rated as following:
★★★★★  sheave
★  gear
★  belt tensioner
★  shiv
★  pulley
★  tensioner pulley
★  tensioner
★  double pulley
★  belt squealing
★  lever
★  harmonic balancer
★  movable pulley
★  overdrive pulley
★  stock pulley
  sprocket
  belt
  moveable pulley
  bad belt
  wheel and axle
  large pulley

Your alternative for pulley is not listed? Suggest!
Speaking about pulley, one probably shouldn't forget about moment of inertia.

Other search terms related to pulley and their ratings are:
★★★★★ moment of inertia
★ motor
You have in mind a companion for pulley and it is not yet here? Propose!



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pulley
sheave
gear