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 split HG Tamiya multi-reinforced carbon, increasing the strength of the center chassis and preventing cracks." Underside Raised Liner Included "To prevent the chassis bottom from hitting the ground when using 23mm tires, raising the chassis bottom is essential. A liner is installed to raise the bottom by about 1mm and polished." Battery Cover Removed "Rubber liners are used to hold down the batteries for weight reduction." Damping Rubber "Provides solid damping to keep jumps low and landings smooth. Black springs are pre-cut by one coil, essential for 3D courses." HG Tamiya Rear Roller Carbon Stay "The chassis shaft is cut, and aluminum shaft black countersunk screws are used. Carbon provides stable support to prevent sagging." Axle Hole Reaming Completed "Axle holes vary in size, and some may not fit 620 bearings. These holes have been expanded using a 6mm reamer." Spur Gear Clearance Modification "The gear covers have been shaved to prevent the spur gear from contacting them." Front and Rear Bumper 1.5mm Bottom-Up Reinforcement "Raising the bottom is essential for installing brake stays and for bank through. Also, because the base becomes weaker by raising it, carbon reinforcement is applied from the inside, and both front and rear are reinforced with black instant glue." Bumper Cut "The post-processing after cutting the bumpers has not been done. It is recommended to adjust them when installing AT or anchor systems." Normal Terminal Voltage Adjusted "If the normal terminals are well-polished, they will have good electrical conductivity and last longer than gold terminals, which get scratched. Each voltage has also been increased with brakes." Normal Gear Cover Screw Fastening "The normal gear covers often come loose, so they are secured with screws. This also supports the motor and prevents voltage leakage. 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 due to 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 must be made 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.