Product Detail Ready to run/crawl out of the box 4WD High-quality composite plastic and metals 27T electric motor 20T pinion paired with an 87T spur gear gives you a quick rock racer ratio, or install the included 14T pinion for a slower rock crawling ratio. . The "Scorpion Rock Racer 1/10 Rock Crawler RTR" is best product for you. We recommended Scorpion Rock Racer 1/10 Rock Crawler RTR