This flexible chassis has been significantly modified from the jig-built flexible chassis. The specifications are as follows: Bridging Construction "The front and rear units are connected with aftermarket straight carbon fiber that has been split, increasing the strength of the center chassis and preventing cracks." Underside Raised with Liner "When using 23mm tires, the bottom of the chassis will hit the ground upon landing, so raising the chassis bottom is essential. A liner is inserted to raise the bottom by about 1mm and polished." Battery Coverless "The battery is held in place with a rubber liner for weight reduction." Damping Rubber "Provides solid damping to keep jumps low and landings smooth. Black spring with one coil cut, essential for 3D courses." Aftermarket Carbon Fiber Stay "The chassis shaft is cut, and aluminum shafts with black countersunk screws are used. Carbon fiber provides stable prevention of sagging." Axle Hole Reamer Applied "There are individual differences in axle holes, and some holes may not fit 620 bearings, so they have been expanded with a 6mm reamer." Spur Gear Clearance Processing "The gear covers are shaved to prevent the spur gear from contacting the front and rear gear covers." Front and Rear Bumpers Raised 1.5mm with Reinforcement "Raising the bottom is essential for bank through when attaching brake stays. Also, because the base becomes weaker by raising it, carbon fiber reinforcement is applied from the inside and reinforced with black instant glue on both front and rear." Bumper Cut "The post-processing after cutting the bumper has not been touched. It is recommended that you adjust it when installing AT or anchor systems." Normal Terminal Voltage Adjusted "If the normal terminals are well-polished, they will have good electrical conductivity and can be used longer than gold terminals, which get scratched. Each voltage is also increased with the brakes." Normal Gear Cover Screwed "The normal gear covers often come loose, so they are screwed in place. Also, the motor is supported, and the voltage does not escape. This is also essential." Counter Gear POM Support "The counter gear is supported by POM with a low-friction plastic bearing set, which is expected to increase torque with low friction. 520 bearing installation is recommended." The chassis is designed to be durable and stable. It is a chassis that bottoms out quite a bit, so gear clearance is also necessary. The voltage increase can change the speed by 1000 RPM, so consider increasing the voltage, securely fix the motor, and use a chassis with solid suspension and good damping. The switch protrudes, so please cut it to your preference. Thank you very much.