Leech trim lines for mainsail

The leech trim lines are specially designed for the mainsail and allow for precise leech trimming. With six self-adhesive trim lines made of high-quality ripstop nylon, you get reliable control over the sail shape.

Product features

• 6 trim threads - Complete set for mainsail leech
• Self-adhesive - Easy installation without sewing
• RIPSTOP nylon - Tear-resistant, durable material
• Bright red - Optimally visible on white sails
• Lightweight - Does not affect the sail shape
• Weatherproof - UV-resistant and saltwater-resistant

Available versions

Specifically for the leech

Leech control: The trim lines are attached to the leech (rear edge) of the mainsail and show the airflow at this critical point.

Optimal trimming: By observing the trim lines, you can optimally adjust the tension of the leech and thus perfect the sail shape.

Twist control: The threads help you to control and adjust the twist of the sail.

RIPSTOP nylon material

Tear-resistant: RIPSTOP nylon is a special fabric with a reinforced grid structure that prevents further tearing.

Lightweight and robust: The material is extremely lightweight, yet very resistant to mechanical stress.

Weatherproof: UV-resistant and saltwater-resistant for long durability in maritime use.

Self-adhesive mounting

No sewing required: The trim threads are self-adhesive and can be installed without a sailmaker.

Easy application: Clean the area on the sail, peel off the protective film and stick on the trim thread.

Strong adhesion: The adhesive adheres reliably to sailcloth and holds even in strong winds.

Red color for optimal visibility

Highly visible: The bright red color is optimally visible on white sails.

Easy to read: Clearly visible even from a distance and from the cockpit.

Tried and tested color: Red is the classic color for leech trim threads.

Application areas

• Mainsail trim on racing yachts
• Leech control on cruising yachts
• Twist optimization at all wind speeds
• Replacement for traditional sewn trimming threads
• Retrofitting new sails
• Sailing schools for training purposes

Advantages at a glance

Specifically for mainsails: Optimized for leech control.

Easy installation: Self-adhesive - no sewing required.

Durable: RIPSTOP nylon is tear-resistant and weatherproof.

Clearly visible: Bright red color for optimal readability.

💡 Tip

Thoroughly clean the area on the leech with alcohol or acetone before applying the trim lines – this ensures optimal adhesion. Press the trim lines firmly into place after application and allow the adhesive to cure for at least 24 hours before hoisting the sail. The optimal application temperature is 15-25°C. Position the six trim lines evenly spaced along the leech – typically at intervals of approximately 1-1.5 meters. The lowest trim lines should start roughly at the level of the first reef. Observe the lines while sailing: ideally, they should point horizontally aft about 50% of the time and flutter slightly upwards the other 50% of the time. If they constantly flutter upwards, the leech is too loose – tighten the outhaul. If they constantly point inwards, the leech is too tight.

⚠️ Important

The trim lines must be glued onto clean, dry sailcloth . Moisture, dirt, or salt will impair adhesion. The adhesive requires 24-72 hours to reach its full strength – do not hoist the sail during this time. Adhesion may be limited on very old or porous sailcloth. Regularly check the trim lines for a secure hold, especially after intensive sailing trips. Adhesive strength may be reduced at temperatures below 10°C (50°F). The trim lines are specifically designed for the leech of the mainsail – other solutions are available for headsails. Ripstop nylon is UV-resistant but may fade after years of intense sun exposure – this does not affect its function. To avoid damage, do not glue the trim lines too close to the batten ends.

Ideal for

• Racing sailors for precise mainsail trimming
• Cruising sailboats for better sail control
• Sailing schools for training purposes
• Retrofitting new mainsails
• Replacement for worn-out traditional trimming threads
• Anyone who values ​​optimal twist and sail shape

Scope of delivery

You will receive a complete set of 6 self-adhesive leech trim threads made of ripstop nylon in bright red.

Quality for precise sail trimming

The leech trim threads combine sophisticated design with robust materials - for reliable performance and optimal sail control in all weather conditions.