KTM 250 XC-W SIX Days [2026] - cast pistons

PROX cast piston for KTM 250 XC-W SIX Days 2026

The PROX cast piston is tailored to the KTM 250 XC-W SIX Days from 2026. The cast aluminum version is suitable for use in 2T engines and offers a clearly defined selection of piston diameter, oversize and compression.

Function and execution

PROX pistons are made from a special alloy that helps minimize friction. PROX's careful development work supports a reliable piston design. The curved piston has a MoS2 coating on the skirt.

Technical data

• Material: aluminum
• Piston Type: Cast
• Piston compression: standard
• Diameter Ø: 66.34 mm
• Letter oversize: B
• Oversize: +0.01
• Stroke: 2T
• Specificity: Domed piston / MoS2 coating of the skirt

Vehicle assignment

The cast piston is intended for the KTM 250 XC-W SIX Days, built in 2026. The selection should be made based on the specified diameter of 66.34 mm, the oversize letter B and the oversize information +0.01.