Ronstan RF20175 Pivoting Lead Block with Cleat – 20mm Ball Bearing Pulley

The Ronstan RF20175 Pivoting Lead Block with Cleat is a compact, high-performance all-in-one control system combining a 20mm ball bearing pulley, pivoting base, and integrated cam cleat—perfect for modern sailing setups.

Designed for efficiency, the RF20175 features a low-friction 20mm ball bearing sheave, ensuring smooth and responsive line movement even under load. The pivoting base automatically aligns with the load direction, improving performance and reducing friction in dynamic sailing conditions.

The integrated Ronstan C-Cleat™ with Fast Track fairlead provides fast, secure rope locking and easy release from any angle, making it ideal for frequently adjusted control lines.

Built from UV-stabilised acetal and 316 stainless steel components, this block is designed for long-term durability and corrosion resistance in harsh marine environments.

With its compact footprint and versatile design, the RF20175 is widely used on dinghies, catamarans, and small keelboats, where space is limited but performance is critical.

Key Features

• 20mm ball bearing sheave – smooth, low-friction performance
• Pivoting lead base – self-aligns under load for efficiency
• Integrated cam cleat (C-Cleat™) – fast and secure line control
• Fast Track fairlead – easy cleating and releasing from any angle
• Compact all-in-one unit – saves space and simplifies rigging
• Durable construction – stainless steel + UV-stabilised materials
• Versatile mounting – suitable for deck or mast installations

Specifications

• Brand: Ronstan
• Model: RF20175
• Product Type: Pivoting lead block with cleat
• Sheave Diameter: 20mm
• Max Rope Diameter: 2–6mm
• Maximum Working Load: 150kg
• Breaking Load: 300kg
• Cleat Load Limit: Approx. 125kg
• Weight: ~79g
• Materials:
  • Acetal sheave
  • 316 stainless steel bearings & housing
• Mounting: 2 x fasteners

Ideal Applications

• Vang systems
• Cunningham and outhaul controls
• Sheet leads and halyards
• Dinghies, skiffs, and catamarans

This unit is ideal when you need combined lead + cleat functionality in a compact, high-performance setup.

Why Buy from Barton Marine NZ?

• Trusted NZ Ronstan supplier
• Fast nationwide delivery
• Genuine high-performance sailing hardware
• Ideal for NZ racing and cruising conditions

Pro Tip 

• Mount within easy reach for quick trimming and release
• Best used on frequently adjusted control lines
• Combine with low-stretch rope for maximum responsiveness