18T and 19T counter gear set for GALM gear drive set and XEX chassis. The smallest counter gear that can be used was 20T, but new designed of P-S gears enabled to use of 18T and 19T counter gears. It will be able to use 2.84 for 19T and 3.00 for 18T low gear ratio. The gear ratio can be set up for low-traction surfaces, technical track, and large acceleration track. And when using a low-turn motor such as our FTS Ver.3 motor 6.5T, it is easier to control the acceleration at low speeds with a lower gear ratio. * Note: P-S stands for Profile-Shifted.