Adjustable cup-and-cone bottom brackets use 2 different fitting styles on the non-drive side, and you need the right wrench profile to engage either one without rounding it off. Park Tool's HCW-11 Adjustable Cup Wrench is a double-ended tool that covers both. One end fits the raised 16mm wrench flats commonly found on adjusting cups, and the opposite end features 2 prongs approximately 23mm apart (center-to-center) for cups with recessed slots. If you're servicing loose-ball bottom brackets and aren't sure which fitting style you'll encounter, this handles both in one tool.

These fittings are common on older bicycles and less expensive bicycles including department store bikes , which means the HCW-11 tends to live in the drawer you open when a vintage road bike or a big-box store bike comes in for a bearing overhaul. The 16mm end works like a standard open-end wrench, engaging the raised flats on the adjusting cup so you can thread it in or out and dial bearing preload. The pronged end drops into the recessed slots found on cups that don't have external flats, giving you the leverage to break them free without damaging the cup face.

The wrench is heat-treated and nickel plated , so it holds up to repeated use without the jaws spreading or the prongs deforming under load. If you're working alongside the HCW-5 lockring wrench during a cup-and-cone bottom bracket service, the HCW-11 handles the adjusting cup while the HCW-5 handles the lockring. The 2 tools together cover the full non-drive-side procedure on adjustable bottom brackets.