PARK TOOL BOTTOM BRACKET LOCKRING WRENCH CUP-AND-CONE HCW-5

The Park Tool HCW-5 is a double-ended wrench dedicated to the notched lockrings of adjustable cup-and-cone bottom brackets. This Park Tool HCW-5 bottom bracket lockring wrench lets you tighten and loosen the lockring that secures the adjustment of the left-hand cup, a key step for a smooth bottom bracket with no play.

The two ends have different profiles to suit the most common lockrings. One side has a single hook that engages most notched lockrings with an outside diameter from 43 to 46 mm; the other has a three-hook profile for 3-notch lockrings with a maximum outside diameter of 46 mm and a minor diameter, measured at the bottom of the notches, of 40 mm. The three-point grip spreads the load and reduces the risk of the wrench slipping when the lockring is very tight. The tool is heat-treated and nickel-plated to resist wear and corrosion, even with daily use.

Park Tool HCW-5 wrench compatibility

• Adjustable cup-and-cone bottom brackets with a notched lockring
• Single-hook end: lockrings with 43-46 mm outside diameter
• Three-hook end: 3-notch lockrings, 46 mm maximum outside diameter and 40 mm minor diameter
• Not suitable for fixed-gear hub lockrings: for these Park Tool recommends the HCW-17

Why choose the Park Tool HCW-5

• Two profiles in a single wrench to cover the most common lockrings
• Three-hook end for a more secure grip on tight lockrings
• Heat treatment and nickel plating for long service life
• Essential for anyone restoring or maintaining bikes with a traditional bottom bracket

For careful adjustment of cup-and-cone bottom brackets, the Park Tool HCW-5 bottom bracket lockring wrench is the dedicated tool that avoids damaging notches and finishes.