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 then polished." Battery Cover Removed "The battery is held in place with a rubber liner for weight reduction." Damping Rubber "It provides strong damping to keep jumps low and landings smooth. The black spring is pre-cut by one coil, which is essential for 3D courses." Aftermarket Carbon Fiber Stays "The chassis shaft is cut, and aluminum shafts with black countersunk screws are used. Carbon fiber provides stable prevention of drooping." Axle Hole Reaming Completed "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 the 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 easily. Each voltage is also increased with brakes." Normal Gear Cover Screw Fastening "The normal gear covers often come loose, so they are fastened with screws. 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 from 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 processing must be done without going through. The voltage increase can change the speed by 1000 RPM, so the voltage increase is considered, the motor is firmly fixed, and the chassis has a solid suspension and good damping. The switch protrudes, so please cut it to your liking. Thank you very much.