OneUp Components 4 Bolt Chainring - 104 BCD - Round - Black - 12 Speed Shimano - 30T YGroup_7033823821869 then hardened and tempered so

then hardened and tempered so you know it's got your back

Ergonomic multi-zone patterning for vibration damping and palm support

Whatever happened

cup and cone bearings

Da Bomb managed to reduce greatly friction

OneUp Components 4 Bolt Chainring - 104 BCD - Round - Black - 12 Speed Shimano - 30T YGroup_7033823821869 then hardened and tempered soUpgrade or complete your drivetrain with a OneUp Components 4 Bolt Chainring. These chainrings are easy to fit and will suit a range of 4 bolt cranks in a handful of BCD's. Choose from standard round chainrings or try out an Oval ring for better traction. Made from a high grade 7075 T6 aluminium these chainrings use a Narrow Wide tooth profile that eliminates chain drop with a perfect mesh between the chain and ring. Compatible with 9, 10, 11 and 12