The Senzo Pro Rear Sprocket (Half-Tooth) is a precision-engineered 219-pitch sprocket designed to give go-kart racers a "micro-adjustment" option for their gear ratios. It allows for 0.5-step gearing increments, which is often the difference between staying perfectly in an engine’s power band or falling out of it during a race. Key Technical Details The "Half-Tooth" Concept: Despite the name, it does not feature a physically "half-sized" tooth. Instead, the teeth are re-profiled and spaced with different geometry. This forces a standard 219-pitch chain to seat slightly differently in the valleys, which effectively shifts the rolling diameter—and thus the gear ratio—by exactly half of a tooth.
