1. Vintage Sailing Hardware & Gear Offered
  2. sku: 3510487356871722
  3. RONSTAN RF187

RONSTAN RF187 Fiddle Jam Blocks

Rf187 Ronstan Pair Of Fiddle V-jam Blocks Used

( Brand: Ronstan ), ( Manufacturer Part Number: RF187 ), ( Part Type: Block )

Review RONSTAN Pair Of Fiddle V jam Blocks Used

The Ronstan RF187 Fiddle V-Jam Blocks are versatile and high-performing sailing accessories designed to provide efficient and secure jamming of sails. These blocks are an essential component for those seeking to optimize their sail trim, particularly in dinghies, keelboats, and other types of sailing vessels.

Crafted from premium-grade materials, these Fiddle V-Jam Blocks feature a durable and corrosion-resistant construction that can withstand the rigors of frequent use and exposure to the marine environment. The V-shape design of these blocks allows for easy and efficient jamming of sails, making it an ideal choice for competitive sailors and recreational sailors alike.

The Ronstan RF187 Fiddle V-Jam Blocks are designed to accommodate lines with a diameter ranging from 3 to 8mm (1/8 to 5/16 inches), making them a versatile option for a wide range of applications. The blocks are also fitted with large, ergonomic handles that provide a comfortable grip and allow for easy and efficient line handling.

The self-aligning bearings used in these blocks ensure smooth and efficient operation, even when subjected to heavy loads and high-speed sailing conditions. The blocks also feature a unique "fiddle" design that helps to keep the line in place, reducing the need for constant re-threading and improving overall sailing efficiency.

Overall, the Ronstan RF187 Fiddle V-Jam Blocks represent an excellent investment for any sailing enthusiast seeking to enhance their sailing experience and optimize their sail trim. With their durable construction, efficient design, and versatile application, these blocks are sure to provide years of reliable and high-performing service on the water.

The Ronstan RF187 Fiddle V-Jam blocks are a popular choice among sailors due to their unique design and functionality. Here are some pros and cons to help you make an informed decision before purchasing.

Pros:

1. Self-Gating: The V-Jam design of these blocks allows the sheet to self-gate, reducing the need for constant adjustment and improving the overall efficiency of your sail trim.

2. Durability: Ronstan blocks are known for their high-quality construction and durability. The RF187 blocks are no exception, with their anodized aluminum body and stainless steel sheaves.

3. Smooth Operation: The bearings used in these blocks ensure a smooth and easy operation, even under heavy load.

4. Versatile: These blocks can be used in a variety of sailing applications, from dinghies to keelboats.

5. Affordable: Compared to other high-performance blocks, the RF187 Fiddle V-Jam blocks are relatively affordable.

Cons:

1. Size: These blocks are larger than traditional fiddle blocks, taking up more space on your boat.

2. Weight: Due to their size and construction materials, these blocks are heavier than traditional blocks.

3. Installation: Installing these blocks may require some additional effort and expertise, as they use a unique mounting system.

4. Limited Applications: While these blocks can be used in a variety of applications, they may not be suitable for extreme conditions or very heavy loads.

Conclusion:

The Ronstan RF187 Fiddle V-Jam blocks offer a unique and effective solution for sail trim, with their self-gating design and smooth operation. However, they come with some trade-offs, such as size, weight, and installation requirements. If you're looking for a high-performance block that can improve your sail trim and are willing to accept these trade-offs, then the RF187 Fiddle V-Jam blocks may be a good investment for you.

Recommendation:

If you're in the market for high-performance sailing blocks and are interested in the features offered by the Ronstan RF187 Fiddle V-Jam blocks, I would recommend giving them a try. However, be sure to consider their size, weight, and installation requirements before making your purchase, and make sure they are the right fit for your specific sailing application.

Details:

Good condition used part. Pair of 2 Ronstan RF187 Fiddle V-Jam Blocks used. Hollow rivets accept fixing screws, shackles or can be used as a Becket for extra purchase.

From Ronstan: Stainless steel cheeks and Acetyl sheaves ensure a long service life with virtually no maintenance. Compare to $45.97 each for new parts from dealers. Maximum line: 5-16 in.

part #: rf187 prices

  • $45.00-$49.80

specifications sailgrinch:

  • brand: Ronstan
  • mpn: Rf187
  • part type: Block

seller sailgrinch:

  • # reviews: 712
  • rating: 100.0%
  • city: Madison, Alabama

payments sailgrinch:

  • credit card: Diners-club
  • wallet: Apple-pay
  • other

shipping sailgrinch:

  • cost: $5.00
  • class: Economy, Standard
  • service: Economy, Standard
  • type: Fixed
  • transit: 6-12 Days

offer sailgrinch:

  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • best offers: True
  • quantity: 1
  • started: January 17, 2026

returns sailgrinch:

  • policy: No Returns

general sailgrinch:

  • condition: Used
  • Boat Parts > Sailing Hardware Gear > Other Sailing Hardware Gear
part type: block,
category: boat parts > sailing hardware gear, sku: 3510487356871722,

Ronstan RF187 Is Similar To:

sailgrinch logo
2 offers $45.00–$49.80 USD
  • Offer #1: $45.00 price + $5.00 shipping estimate = $50.00* total. Maximum line: 5-16 in. Good condition used part.+$5.00 shipping
  • Offer #2: $49.80 price + $0.00 shipping estimate = $49.80* total. HARKEN Single Bullet w/Becket for Wire. Ronstan Series 29 Fiddle Block With Vee Jam Part Number - RON- RON-.FREE SHIPPING

Copyright © sailgrinch.com