Gear Part

Gear Parts are special and technical mods (modifications) of Extreme Gear debuting in Sonic Riders: Zero Gravity and later carried on into Sonic Free Riders which plays an important role in the gameplay of these two racing games. The Gear Parts of a Gear are 'programmed' into the Gear which when activated, provides/upgrades various characteristics to/of the Gear while in a race which ranges from upgrading the basic attributes of the Gear (Dash/Acceleration, Limit/Top Speed, Power/Durability or Cornering/Turn) to additional abilities such as the ability to grind on rails.

Sonic Riders: Zero Gravity
As this game debuted the content of Gear Parts, most of the Extreme Gear obtained in Sonic Riders: Zero Gravity have a maximum of 3 Gear Parts installed into the Gear. While in a race, the Gear Parts will remain inactive until the character acquires and trades a specific number of Rings for activating each of those Gear Part. The Gear is covered by an orange-colored void indicating that the Gear is modified with that Gear Part in effect.

By the player's will, he/she does not need to activate all of the Gear Parts in order so for example, if the character has enough Rings for activating a 'Max Speed UP' Gear Part but wants to save Rings for the 'Air-Ride' Gear Part which obviously costs more Rings, he/she may save the number of Rings for that 'Air-Ride' Gear Part instead of spending the Rings for the current Gear Part. Note that some Gear Parts of a Gear may require a high number of Rings and some Gear Parts of a Gear must have a previous Gear Part activated beforehand.