Description and materials - High quality BONZ Expert screw-on sprocket. - Made from heat-treated steel to resist big amounts of power. - Standard 1,37" x 34 tpi thread, suitable for all rear hubs and cranks. - 7.5mm wide base ensures a good number of threads on the hub/crank. - Suitable for all 1/8 and 3/32 chains. - 12, 14 or 15 teeth options available. Dimensions - 12, 14 and 15 teeth - Base width: 7.5mm Finishes - Matt anodised black Weight - 22g (12T) and 46g (15T)