Beta RR 390 4 T Race [2025-2026] - Piston Kit

PROX piston kit for Beta RR 390 4 T Race

The PROX piston kit is intended for the Beta RR 390 4 T Race built in 2025-2026. The forged aluminum piston combines the specified standard compression with a technical design designed for this application.

Technical features

• Material: aluminum
• Piston Type: Forged
• Piston compression: standard
• Diameter Ø: 87,960 mm
• Letter oversize: A
• Oversize: STD
• Compression ratio: 12.5:1
• Stroke: 4T
• Specificity: Flat with hollow

Vehicle assignment

The piston kit fits the Beta RR 390 4 T Race in the full year range 2025-2026. The product description lists the piston set for models with fuel injection from 2016.

Kit contents

The set contains the piston, piston rings, piston pin and circlips. The kit therefore includes the components listed for replacement in the piston area.

The combination of forged aluminum design, a diameter of 87,960 mm and the compression ratio of 12.5:1 makes targeted selection based on the technical engine data easier. Before ordering, the vehicle model and year of manufacture should be compared with the specified assignment.