Much attention will be given to their performance. In addition to microcomputer components, mechanical components of the vehicle play an important part. Factors affecting the performance include the number of tires, the materials used and the vehicle weight. Larger tires on the rear provide a better grip and easier maneuvering at curves, while smaller and lighter tires allow faster rotation by the motor, which are advantageous at straight roads, but provide a poor grip. The mechanical components are often refined with advanced technology that is no inferior to those in real vehicles.
Some cars adopt suspension systems and have special steering motors.
The battery capacity is also one of the determinants of performance. As the weight and the voltage of fully-charged batteries and used batteries slightly differ, much though must be given to how many batteries should be exchanged after a trial run or upon rerun. In the Japan Micom Rally, two cars will run in each race. They will eventually intersect at the interchange. As they will run on the same course with half a lap between them, one of the cars will appear to be chasing the other.