Bicycle flywheel is a part of the bicycle tool. The durable tool of circle bicycle flywheel is a special collection of the finest "shop quality" tools. Just about everything needed to perform most repair and maintenance tasks， from brake adjustments to headset overhauls， on the majority of current model bikes is in this best bicycle kit. The durable tool of bicycle flywheel will be your best choice to maintenance your bicycle.                                    Features             Incorporates shift ramps and specially contoured tooth profiles<br> Improved chain control to provide a fast and precise shift<br> Plated sprockets for smooth performance and improved durability<br> Drilled out sprockets for weight savings over previous model<br> 11，13，15，18，21，24，28，32 cogs<br> Shimano DEORE， XT， LX， ALIVIO， ACERA，105，TIAGRA，SORA or SRAM 8 speed compatible<br>                                                            Specifications             Diameter    59.06" / 150cm    <br> Color     Silver    <br> Weight     11.67oz / 331g    <br>                                                             Package Includes            1 x NEW 2010 SHIMANO CS HG61 9 SPEED 11T-32CASSETTE<br>