(Attention: Standard 9 hole sprockets 24T to 60T in Kit do not work on this alum wheel )29"/700c Aluminum Wheels are Designed mainly for motorized bicycles. light and very durable. 29" /700C Size Wheel;do not need adapter, sprocket only needed; easy install sprocket on mag wheel;<br>(Attention 2: please smear lubrication oil or engine oil on 6pcs screws before fastening sprocket/disc brake rotor on mag wheel in order to prevent damage of screw thread inside of mag wheel from happening. <br>smear lubrication oil or engine oil on the screw thread which connects the flywheel)