STRONGLIGHT Bottom Bracket Dust Cap 23mm 49D 1950 Super Compétition Dural Forgé CP6

There are components you only notice once they are missing. A 23 mm STRONGLIGHT 49D dust cap belongs to that discreet category: screwed onto the crank arm, it closes the spindle area and, on period-correct builds, carries a visible catalogue reference. This one is marked 49D, from the Super Compétition range — the STRONGLIGHT line aimed at high-end cranksets — and. The part retains its full 23 mm diameter, and the oxidation check is negative: no corrosion is present. The photos are part of the description.

A STRONGLIGHT cap with a French origin

Country of origin: France. That detail alone places the piece within a precise industrial lineage, the kind French component makers built their reputation on during the second half of the twentieth century. Material is aluminium, as specified. A faint trace of storage or of past use can never be fully excluded, which is the normal lot of any part that has spent decades in circulation; what matters is that no oxidation is recorded.

Key specifications

• Country of origin: FRANCE
• Oxidation: No
• Material: Aluminium
• Manufacturer part number: 0000
• Dust cap diameter: 23 mm

Where it fits in a restoration

Rebuilding a crankset is rarely about one piece, and these capping parts work alongside the rest of the drivetrain. If you are putting together the front end of a vintage road or touring bike, our pedal components cover the matching ground. A Peugeot 46T vintage chainset, 170 mm, 14x1.25 French thread pairs naturally with original French crankset furniture of this type, while the Shimano DURA ACE vintage front derailleur in Duralumin and steel suits the same Eroica-era builds.

One cap or a pair — the diameter is what decides. At 23 mm, this is the reference to keep in mind when cross-checking a crankset before fitting.