BPitmoto - CGSP301686 - Sprocket 25H - 78 Tooth, Rear - Cag ReviewbP PP Pitmoto - CGSP301686 - Sprocket 25H - 78 Tooth, Rear - Cag PRear 78 tooth sprocket for 47cc or 49cc mini pocket bikes, pocket quads and other applications.Most stock models come with a 60 tooth sprocket. The 78 tooth sprocket will increase your low end torque. Specifications: Size: #25H Teeth: 78 Bolt Spacing: 1.