Designed mainly for motorized bicycles;do not need adapter, sprocket only needed;<br>Magnesium Wheels excluding chain drive Sprocket<br>Light and very durable. 29"/700c Size Wheel;<br>Axles included;easy intall sprocket on mag wheel,<br>Attention: Standard 9 hole sprockets 24T to 60T in Kit do not work on this magnesium wheel, buyer need drill 6 holes in middle to make sprocket fit on the magnesium wheel or buyer buy our multifunctional sprocket which fits well on our magnesium wheel<br>Easy intall sprocket on mag wheel