to customize the performance of the vehicle to the particular track. Higher specification motors can be used to replace the standard FA-130 type motor. There are three specifications that characterize all motors: RPM, torque, and power-consumption. RPM is the speed the motor provides, and the torque its strength. A higher RPM means higher maximum speed, higher torque gives more acceleration and allows the car to better withstand the difficulties of climbing slopes or running through turns. Gears can also be replaced with sets with different ratios. Common ratios include (3.5:1), (3.7:1), (4:1), (4.2:1), (5:1), and "Special" (ratio varies but are usually 6.4:1). The higher the ratio, the better the acceleration rate and torque; the lower the ratio, the better the maximum speed. In a standard car, the left and right wheels are on a fixed axle. Special one-way wheels can be added to allowed the left and right wheels to rotate at different speeds acting as a differential, to allow for improved cornering performance. In addition, upgrade parts such as bumper width extensions, stabilizers, and brakes can be added that aid in the car's performance through corners, banked turns, elevation changes, and jumps. See also Dash! Yonkuro - A popular manga/anime based on Mini 4WD Bakusō Kyōdai Let's & Go!! - A popular manga/anime based on Mini 4WD Racer Mini Yonku: Japan Cup - A Famicom video game References External links Toy cars and trucks Tamiya Corporation 1980s toys 1990s toys 2000s toys 2010s toys