The best replacement for gear ratio is tire size.

The best alternatives to gear ratio are rated as following:
★★★★★  tire size
★★★★★  rpm
★★★★  torque
★★  gas mileage
★  mechanical advantage
★  axle ratio
★  fuel economy
★  lower gear ratio
★  low gear ratio
  higher gear ratio
  tire height
  fuel mileage
  final drive
  3.73
  engine rpm
  decrease ratio
  4.1 ratio

Your alternative for gear ratio is not listed? Suggest!
Speaking about gear ratio, one probably shouldn't forget about worm gear.

Other search terms related to gear ratio and their ratings are:
★★★★★ worm gear
★★★ rpm
You have in mind a companion for gear ratio and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gear ratio in all years. Click on graph for more.
gear ratio
tire size
rpm