Simple conversion solution for the rear wheel with 10-inch SIP Pordoi Rim (Zip rim type).

The design of the rear Brake Drum on Vespas remained virtually unchanged for decades. Even when the PX received a disc brake update at the front with a star-shaped "Brake Drum", the rear remained untouched and therefore visually inconsistent. SIP now enables an upgrade for the familiar brake drum world.

• Conversion of classic Smallframe - Vespas to SIP Pordoi 10" rim ET30 (type "Zip rim")
• Precise CNC manufacturing: smooth running, high-strength, lightweight
• For smallframe and largeframe > rear <

What we call the "Wheel Hub" on the front Disc Brake is called the Drum Brake Seating and Brake Drum on the rear wheel. Both parts together replace the standard rear Brake Drum. This changes the bolt circle for mounting the wheel from the typical Vespa ring rims with 5 x 220 mm Screws to 5 x 86 mm as on modern Vespas and ZIP, ET4/ET4 vehicles. This means that the desired rims of the newer design and in the dimensions 2.50-10" ET30 5/86 can be fitted.

The SIP PORDOI rims are the eye-catcher par excellence. But rims from CRIMAZ or KR Automation also look good. Unfortunately, the wide Spokes of the POLINI Rim hit the outer edge of the Brake Drum; if you are brave, you can fix this collision with a Dremel.

The Drum Brake Seating Smallframe fits the following Models:

• Vespa 50-125/PV/ET3
• Vespa PK/S/XL/XL2/FL

The conversion requires the following parts:

• Drum Brake Seating SIP part no. 24277410
• Brake Drum SIP part no. 24277400
• Rim offset ET30, bolt circle 5/86mm, center hole Ø 46mm for PIAGGIO ZIP II/SP/ZIP 2000/Vespa ET2/ET4 50-150 Models, preferably the SIP Pordoi Rim 6505

Quality and production

The parts are CNC machined with high precision. The Brake Drum is made of a special free-cutting steel whose good braking effect has already been proven in the SIP CNC Brake Drums for the Wideframe models in 8, 9 and 10 inches. The surface is black nitrided. The SIP logo is milled into the surface.

Track alignment and wheel contact point

The conversion in combination with a 2.50x10 ET30 5/86 Rim results in a wheel contact point offset of a few millimeters compared to an original rim. The offset is similar if a standard ring rim with 2.10" Width is replaced by a wider 2.50 x 10 inch ring rim. It is recognized that the effect of this small offset is hardly noticeable. We also recommend converting the front wheel to the ZIP Rim to restore the alignment of the front and rear wheels.

Conclusion: A simple and modern update for the classic Vespa models.