Trek Bike Madone 2008 Bottom Bracket Bearing KIT 6309 the 6004ZZENR outer diameter is

the 6004ZZENR outer diameter is 42mm

NJ314MC3BNLS Nachi Cylindrical Roller Bearing

💡 Why use flanged sealed bearings in RC and hobby builds

✅ Max speed with oil: 13

Automatically locks in reverse to stop backdrive

Trek Bike Madone 2008 Bottom Bracket Bearing KIT 6309 the 6004ZZENR outer diameter isBall Bearings for Trek Bike Madone 2008 Bottom Bracket Closures: Rubber Sealed Closure Side: Double Sided Seals Lubrication: Low Friction Grease Material: Corrosion Resistant Chrome Steel Balls: High Chromium Steel 52100 SAE Steel Balls Cage: Low Friction Steel Precision: ABEC 1 Quality Brand: VXB Quantity: Set of two Bearings