Double Roller | Mini 4WD Wiki | Fandom
The double rollers (Japanese: 2ローラー, Nitan Rōrā) are a series of Mini 4WD GradeUp Parts released by Tamiya since June 20, 2009. The double rollers, as their names suggests, is a set of rollers with two different, integrate rollers with different diameters, usually 1mm apart. In Mini 4WD racing, having a set of roller on top of the bottom rollers on the front will improve the car ...