Ronstan 8:1 4:1 Only Lower Two-Speed Mainsheet Blocks

Ronstan 8:1 4:1 Only Lower Two-Speed Mainsheet Blocks

20 in stock

Ronstan Two-Speed Lower Mainsheet Blocks are key components for optimizing variable-mechanical-advantage systems. Designed specifically to work with upper blocks, they enable configurations that alternate between trimming speed and power. A spring-loaded articulated base keeps the unit upright, ensuring perfect line alignment and preventing the system from striking the deck. They are the ideal technical solution for sailors who want to customize their mainsheet system for durability, low weight, and flawless mechanical response under load.

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At Saildeck Gear, we specialize in technical rigging, blocks, winches, and deck hardware for boats between 30 and 60 feet. We know that every boat is different: working loads, mast dimensions, the type of maneuver, and how you use your boat—cruising, racing, or charter—all affect what you actually need.

That’s why we don’t publish a fixed price on the product page: we prefer to speak with you first.

Tell us which product you’re interested in and which boat you’ll be installing it on, and we’ll prepare a quote tailored to your setup, including technical advice and with no obligation.

If you have any questions about compatibility, measurements, or which part is right for your rig, you can also contact us here. We normally respond within 24–48 hours.

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