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 solid 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 Stay "The chassis shaft is cut, and aluminum shaft black countersunk screws are used. Carbon fiber provides stable prevention of sagging." Shaft Hole Reamed "There are individual differences in shaft holes, and some holes may not fit 620 bearings, so they have been expanded with a 6mm reamer." Spur Gear Clearance Modification "The gear covers have been shaved to prevent the spur gear from contacting them." 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 both front and rear are reinforced with black instant glue." Bumper Cut "I haven't touched the post-processing after cutting the bumper. It's best to adjust it when installing AT or anchor systems." Normal Terminal Voltage Adjusted "If the normal terminals are well-polished, they will conduct electricity efficiently and last longer than gold terminals, which get scratched. 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 doesn't 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's a chassis that bottoms out quite a bit, so gear clearance is necessary. The voltage increase changes the speed by 1000 RPM, so consider increasing the voltage, securely fix the motor, and use a chassis with solid suspension and damping. The switch sticks out, so please cut it to your preference. Thank you very much.