The best replacement for flywheel is flexplate.

The best alternatives to flywheel are rated as following:
★★★★★  flexplate
★★  soul cycle
★★  rear wheel horsepower
★★  steel
★  flybarre
★  ring gear
★  magnetic resistance
★  starter
★  soulcycle
★  battery ups
★  doom loop
★  taxi magic
★  wp engine
★  magnetic cross trainer
★  heavy flywheel
  dual mass
  steel flywheel
  rear wheel hp
  aluminum
  wheel horsepower
  dual mass flywheel
  resurface
  governor
  rwhp
  aluminum flywheel
  magnetic bike
  28 oz
  chromoly
  flex plate
  wheel hp
  light flywheel
  single mass flywheel
  solid flywheel
  lightened flywheel

Your alternative for flywheel is not listed? Suggest!
Speaking about flywheel, one probably shouldn't forget about clutch.

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



Google Trends

Scale is based on the average worldwide traffic of flywheel in all years. Click on graph for more.
flywheel
flexplate
soul cycle