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 offers a clearly defined technical design for repairing the 4T engine.

Technical features

• Material: aluminum
• Piston Type: Forged
• Piston compression: standard
• Diameter Ø (mm): 87,970
• Letter oversize: B
• Oversize: +0.01
• Compression ratio: 12.5:1
• Stroke: 4T

Matching vehicle assignment

The piston kit fits the Beta RR 390 4 T Race in the full year range 2025-2026. The assignment supports the selection of the appropriate piston for this specific motorcycle model.

Scope of delivery

The kit includes pistons, rings, piston pins and circlips. The scope of delivery therefore includes the components for piston replacement listed in the product set.

Selection guide

When making the selection, the diameter of 87,970 mm, the oversize letter B, the oversize specification +0.01 and the compression ratio 12.5:1 should be taken into account in particular. The standard piston compression and the forged aluminum piston design complete the technical characteristics of this PROX kit.