The technical data of the front sprocket JTF 712: Material: SCM420 chromoly steel alloy Hub Teeth : 6 with 4mm Hub Diameter: 14mm Hub Diameter: 17mm 2 opposite mounting holes, center hole, center hole 28mm distance All sprockets are made of C45 or C49 steel and have OEM quality. We only use sprockets made by top brand manufacturers JT ( Jomthai ), Maxum-Tech ( made by JT ), Supersprox or Esjot. A first-class sprocket and pinion should always be installed with a first-class chain. Therefore, we combine our sprockets only with the chains of the Japanese original equipment manufacturer RK and DID.
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