Reserve Tank

The Reserve Tank (リザーブタンク) is a Bike type Extreme Gear that appeared in Sonic Riders: Zero Gravity and Sonic Free Riders. It cannot accumulate Gravity Points (GP)/Air, but instead carries three additional storage tanks to replenish itself when it is about to run out of fuel.

Sonic Riders: Zero Gravity
The Reserve Tank made its first appearance in Sonic Riders: Zero Gravity. It can be purchased in the shop for 3,960 rings.

In Sonic Riders: Zero Gravity, the Reserve Tank resembles more or less a standard motorcycle. It carries little covering for its structure, and most of it is colored grey and white. Most noticeably, however, it has three white GP storage tanks with yellow stripes mounted on its rear, which is used to storage extra GP.

Unlike most other Extreme Gears in Sonic Riders: Zero Gravity, the Reserve Tank cannot accumulate GP by any means, be it either by performing tricks, smashing through obstacles, obtaining GP from Item Boxes or performing Meteor Burst during a Gravity Dive. Instead, the Reserve Tank carries three identical Gear Parts unique to itself, called Tank that, when activating one of them, will automatically refill the Reserve Tank's GP gauge completely once. This allows the players to refill the Reserve Tank's GP gauge up to three times during a race. Every time one of the Reserve Tank's Gear Parts is activated, one of the GP storage tanks on the back of the Reserve Tank falls off, signifying that one of the tanks have been used.

Gear Parts

 * Tank: Fully restores the Reserve Tank's GP gauge.
 * Tank: Fully restores the Reserve Tank's GP gauge.
 * Tank: Fully restores the Reserve Tank's GP gauge.

Sonic Free Riders
The Reserve Tank reappeared later in Sonic Free Riders. Because the Extreme Gears run on Air in this game, the Reserve Tank's storage tanks had been rebuilt to contain Air rather than GP.

In Sonic Free Riders, the Reserve Tank retains much of the same design that Sonic Riders: Zero Gravity. However, it did receive pale amethyst colored plates across its structure, making it resemble more of a sport bike, while its storage tanks on its rear are recolored green.

Like in Sonic Riders: Zero Gravity, the Reserve Tank is unable to accumulate Air, be it either by performing tricks, smashing through obstacles, or obtaining Air from Item Boxes, and instead relies on refilling its Air tank through the three additional Air storage tanks that it carries around, allowing it to completely restore its Air tank up to three times during a race. However, in this game, whenever the Reserve Tank runs out of Air, it automatically uses one of its extra Air storage tanks to refill itself (which is signified by one of the tanks falling off), rather than the players do it manually, until it runs out of storage tanks.