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These are the ultimate FTC wheel sprockets. We had drive motors powering our rear wheels, and free-spinning omni wheels in the front. For extra traction, we linked the rear and front wheels with these 24-tooth Ninja Star Sprockets and #25 chain, BRILLIANT! The only gotcha was finding the right spacers to space between wheels and sprockets so the chain didn't rub up against anything. That would be a great product suggestion, if you're listening...