Speedometer Worm Gear Cover Plate - BGM ORIGINAL - Vespa V50, PV125, ET3

BGM ORIGINAL Speedometer Worm Gear Cover Plate – Galvanized Steel for Vespa V50, PV125, and ET3

Small part, important function: The BGM ORIGINAL cover and retaining plate secures the speedometer cable housing to the front wheel speedometer drive. It ensures that the speedometer cable sits correctly in its housing and that the rotational movement of the speedometer drive can be reliably transmitted.

The plate is made of galvanized steel. The protective zinc coating reduces susceptibility to corrosion and ensures a durable surface. Thanks to its universal mounting options for 13.5 and 17 mm hole spacing, it is suitable for various versions of the classic Vespa small-frame models.

The advantages at a glance

• Galvanized steel: Sturdy construction with a protective zinc coating
• Two hole spacings: Compatible with 13.5 mm and 17 mm
• Universal use: For Vespa V50, 50N, PV125, ET3, and other compatible small-frame models
• Secure fastening: Holds the speedometer cable housing in its intended position
• Ideal for restoration: High-quality replacement for damaged or rusted original metal plates

Why the Retaining Plate Is Important

The mechanical speedometer on the classic Vespa is driven by a mechanism on the front wheel. The speedometer worm gear transmits the rotational motion to the flexible speedometer cable, which relays it to the speedometer in the handlebars.

For this to work reliably, the outer sheath of the speedometer cable must sit securely in its housing. This is precisely the role of the retaining plate.

If the bracket is missing or severely bent, the speedometer cable sheath may lose its proper fit. This can interfere with the inner speedometer cable’s engagement and cause the speed display to fail.

The BGM ORIGINAL retaining plate, made of galvanized steel, restores the intended mounting and offers a durable solution thanks to its protective surface coating.

One design for two mounting distances

Classic Vespa small-frame models feature different mounting hole spacings.

The BGM ORIGINAL mounting plate is designed so that it can be used for both variants:

• Hole spacing 13.5 mm
• Hole spacing: 17 mm

This eliminates the need to search for different mounting plates for the various models.

Galvanized steel with a protective finish

The mounting plate is located near the front wheel and is regularly exposed to splashing water, dirt, and moisture.

The galvanized steel construction provides excellent protection against corrosion. The zinc coating forms a protective surface and reduces susceptibility to rust compared to untreated steel.

This makes the BGM ORIGINAL mounting plate suitable both for repairs on vehicles used in everyday life and for the professional restoration of classic Vespa models.

Technical Specifications

Compatible Vehicles

For classic Vespa Smallframe models with the appropriate mounting, specifically:

• Vespa 50 / 50N / 50L / 50R
• Vespa 50 Special
• Vespa V90
• Vespa 125 Primavera (PV125)
• Vespa 125 ET3
• Other small-frame models with a compatible speedometer shaft mount and a 13.5 or 17 mm hole spacing

Installation Instructions

The mounting bracket is installed at the lower end of the speedometer cable near the front swingarm.

• Insert the speedometer cable sleeve completely and correctly into the designated mount.
• Make sure that the square section of the inner speedometer cable engages cleanly with the speedometer drive.
• Position the mounting plate with the correct hole spacing and secure it.
• Check that the speedometer cable sleeve is securely seated and cannot slip out of the housing.
• Check the condition of the speedometer cable and the associated rubber connector.

Tip: If the speedometer is no longer working, it’s worth checking not only the mounting but also the speedometer cable and the speedometer worm gear for damage or wear.

OEM Equivalent Numbers

Piaggio: 057938, 55273, 57938

The OEM numbers are provided for comparison purposes only and do not indicate the part’s origin.

Package Contents

• 1 × BGM ORIGINAL speedometer worm cover plate made of galvanized steel

Mounting screws and other speedometer drive components are not included.

Frequently Asked Questions (FAQ)

What is the cover plate used for?

The plate secures the outer speedometer cable sleeve to the front wheel’s speedometer drive and prevents it from shifting out of position.

What do the hole spacings of 13.5 and 17 mm mean?

Classic Vespa small-frame models have different mounting dimensions. The BGM ORIGINAL plate offers mounting options suitable for both versions.

Can the plate rust?

The mounting plate is made of galvanized steel. The protective zinc coating significantly reduces susceptibility to corrosion compared to untreated steel. However, rust may still form if the coating is damaged or after prolonged exposure to moisture and road salt.

Will a new mounting plate fix a malfunctioning speedometer?

If the speedometer cable sheath is no longer properly secured, a new retaining plate can resolve the issue. However, if the speedometer cable, the speedometer worm gear, or other parts of the drive mechanism are damaged, these must be inspected separately and replaced if necessary.