Synchro Double Block

Balanced Performance for Modern Rigs

The Lewmar Synchro Block Double is engineered to deliver smooth, efficient load handling in performance-focused sailing systems where precision and reliability are essential. Designed for racing yachts and fast cruising vessels alike, it offers controlled mechanical advantage with responsive, low-friction operation, supporting condifent sail trimming under load.

Double-Sheave Configuration

The twin-sheave layout provides increased mechanical advantage while maintaining a compact, efficient footprint. Even load distribution across both sheaves improves system efficiency and reduces handling effort, making the block well suited to control cascades, trimming systems, and other applications where progressive adjustment and consistent performance are required.

Advanced Synchro Bearing Technology

As part of Lewmar’s Synchro range, the block incorporates precision bearing technology designed to minimise friction under load. This advanced engineering delivers smoother rope movement, faster response, and reduced effort during repeated trimming and easing, particularly valuable in high-workload sailing environments.

Marine-Grade Composite Construction

Manufactured from durable, marine-grade materials, the Synchro Block Double is built to withstand sustained loads, saltwater exposure, and frequent cycling. Robust side plates and carefully profiled sheaves ensure dimensional stability, resistance to wear and reliable long-term operation in demanding onboard conditions.

Smooth, Consistent Operation

Optimised sheave geometry promotes clean rope alignment and efficient load transfer, delivering predictable, low-friction performance throughout the working range. Reduced energy loss not only improves sail-handling efficiency but also helps protect running rigging from unnecessary wear over extended use.

Installation & Application

Well-suited to performance sailing applications including control lines, fine-tune systems, and deck-level lead arrangements, the Lewmar Synchro Block Double integrates seamlessly into modern rig and deck layouts. Its balance of power, refinement, and durability makes it a professional-grade solution backed by Lewmar’s long-standing expertise in sail-handling hardware.