Samox 323ASS Chainring Set - 50/39/30t 130/74 BCD Aluminum Outer Ring Steel Middle/Inner Ring BLKSamox 323ASS Chainring Set 50 39 30t 130 74 BCD Aluminum Outer Ring Steel Middle Inner Ring Black. Samox chainring sets for use with various cycling disciplines. Chainring bolts sold separately TECH SPECS Color Black Ring Position Type Outer Ring Position Type Middle Ring Position Type Inner Tooth Count 50 Tooth Count 39 Tooth Count 30 Round or Oval Round Drivetrain Speeds 9 Drivetrain Speeds 10 Chainring BCD 130 Chainring BCD 74 Material Aluminum