Ronstan Series 55 Ratchet Mount Orbit Block with Fiddle Becket Swivel – High Holding Power and Auto/Manual Modes

Series 55 Ratchet Mount Orbit Block - Fiddle Becket Swivel

Features:

• Up to 20:1 holding power
• Smooth easing of sheets
• High performance cleating

Automatic ratchet block

Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.

* Selected Series 55 models.

Awesome ratchet block holding power

Quite simply, Ronstan Ratchet Orbit Blocks have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitor. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designs have only 8 faces with an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load

Materials:

• Sheave: Anodized Aluminium
• Ball Bearings: High compression strength carbon black Acetal
• Frame/Cheeks: Toughened, glass fiber reinforced Nylon
• Rope Link: UV stabilized, multi-strand impregnated SK75 Dyneema

The Ronstan Series 55 Ratchet Mount Orbit Block with Fiddle Becket Swivel is designed for demanding sailing applications where precision and reliability are essential. Featuring a compact yet durable construction, this high-performance block provides up to 20:1 holding power, ensuring your sheets stay securely in place under load. The robust design includes a sophisticated NC-machined sheave with Generation 2 patented geometry, which offers exceptional grip with 12 straight gripping faces that resist line movement and distribute load evenly, minimizing rope wear.

One of the key advantages of this series is its versatile automatic ratchet mechanism that allows switching between auto and manual engagement modes. In auto mode, the ratchet engages when load is applied and disengages when unloaded, facilitating smooth sheet running and rapid gybing of asymmetric spinnakers. Manual mode provides sailors with full control, enabling the ratchet to be turned on or off as needed—ideal for top sailing performance. This flexibility makes the Ronstan Series 55 an excellent choice for sailors seeking customizable sheet handling solutions.

Constructed from high-quality materials, the sheave is anodized aluminum, providing corrosion resistance and lightweight strength. The ball bearings are made from high compression strength carbon black Acetal, ensuring smooth operation and durability. The frame and cheeks are crafted from toughened, glass fiber reinforced nylon for added resilience, while the UV-stabilized, multi-strand impregnated SK75 Dyneema rope link guarantees reliable, long-lasting performance in harsh marine environments. Whether racing or cruising, this orbit block offers exceptional holding power, smooth easing, and adjustable engagement modes that enhance sailing efficiency and safety.

Features:

• Up to 20:1 holding power for secure sheet control

• Smooth easing of sheets for precise handling

• High performance cleating system for reliable grip

• Automatic ratchet mechanism with selectable auto/manual modes

• Robust construction using anodized aluminum, reinforced nylon, and durable Dyneema rope link