Words to Describe gearset

How gearset often is described ("________ gearset")

• progressive
• secondary
• single
• simple
• reduction
• forward
• parallel
• differential
• real
• additional
• speed
• conventional
• internal
• bevel
• auxiliary
• enveloping
• nonhunting
• front
• helical
• planetary
• formative
• overdrive
• rear
• locking
• typical
• selective
• final
• ideal