The technical data of the front sprocket JTF1332: Material: SCM420 chromoly steel alloyHub Teeth : 13 Hub Diameter: 26mm Hub Diameter: 30mm Thickness: 14,5mm 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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