[. . . ] Goat Crawler ESC Recommendations Losi's® 1/10Scale Comp Crawler Race RollerTM uses wormdrive transmission gears. [. . . ] We recommend using profile 3, or Servo mode, with your Goat 2S ESC in your wormdrive crawler to combat this issue. Low gear reduction, which is associated with wormdrive transmissions, results in a wheel speed that may be lower than if you used a standardtransmission vehicle, especially if using an 18. 5 or 21. 5turn brushless motor. If more wheel speed is required, Novak's Crawler 13. 5T Brushless Motor is a great option to increase wheel speed and retain all of the advantages of the wormdrive transmission and Goat 2S ESC software. Novak's Goat 3S ESC is preset to the wormdrive profile by default (Profile 2), so you should not experience any heating issues associated with running the hill hold brakes with your wormdrive crawler. Instead of using Novak's Crawler 13. 5T with 2S LiPo to gain wheel speed, you may opt to use a 3S LiPo battery pack. With the added power and wheel speed provided by the 3S Li Po pack, we do not recommend using the Crawler 13. 5T Motor in conjunction with a wormdrive crawler. [. . . ] When using a 3S LiPo pack, it is necessary to use the included 3 Amp HighVoltage Universal BEC to ensure proper operation. [. . . ]