TREK KNOCK BLOCK HEADSET BEARINGS
Available in Steel, Stainless Steel, Hybrid Ceramic, Black Oxide or Superlight SL Alloy
Black Oxide is a great alternative to Stainless Steel
Upper bearing –Â MH-P03K (30.15x41x6.5 – 36/45)
Lower bearing –Â ACB518K (40×51.8×8 – 36/45)
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