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Description
Ronstan Series 75 Ratchet & Ball Bearing Blocks 3:1 Coarse & 6:1 FineProduct Description Ronstan Series 75 Ratchet & Ball Bearing Blocks 3: 1 Coarse & 6: 1 Fine Rope Not Included Features Coarse and and fine tuning purchase system Unrivaled 18: 1 holding power Dual sided On Off switch Low friction ball bearing system Lightweight Cheek cut outs for easy bearing maintenance Sheave 3 + 2 in. Max. Rope 3 8 in. Max. Cable in Pin in. M. W. L. 1760 lb. B. L. 3750 lb. Weight 49. 9 oz. Product Information Two speed mainsheet
Product Description
Ronstan Series 75 Ratchet & Ball Bearing Blocks 3:1 Coarse & 6:1 Fine
Rope Not Included
Features
Coarse and and fine tuning purchase system
Unrivaled 18:1 holding power
Dual sided On-Off switch
Low friction ball bearing system
Lightweight
Cheek cut-outs for easy bearing maintenance
Sheave Ø - 3 + 2 in.
Max. Rope Ø - 3/8 in.
Max. Cable Ø - in
Pin Ø - in.
M.W.L. - 1760 lb.
B. L. - 3750 lb.
Weight - 49.9 oz.
Product Information
Two-speed mainsheet systems allow both coarse and fine tuning in a single purchase system. The system allows fine tuning of the mainsheet when sailing upwind by using one of the sheet tails and keeping the other cleated. Using both the sheets at once allows the trimmer to blow off the main quickly when rounding the top mark and trim on quickly when hardening up after rounding the bottom mark. When fitting to traveler cars, ensure adequate support for the bottom block and use stand-up spring kit RF324-1 or RF324-2. (Refer to traveler section for more information).
Applications
Mainsheets on sportsboats and keel boats to 12m (40ft)
Mainsheets on sportsboats and keelboats to 12m (40')
Max. mainsail area, END boom sheeting = 38sq m (409 sq ft)
Max. mainsail area, MID boom sheeting = 23sq m (248 sq ft)
Materials
Carbon Black Acetal ball bearings
U.V. stabilized Acetal sheaves, alloy ratchet sheaves
Alloy cheeks
Torlon® ratchet pawl
Adjustable cleat arms
Features
Product Information
Two-speed mainsheet systems allow both coarse and fine tuning in a single purchase system. The system allows fine tuning of the mainsheet when sailing upwind by using one of the sheet tails and keeping the other cleated. Using both the sheets at once allows the trimmer to blow off the main quickly when rounding the top mark and trim on quickly when hardening up after rounding the bottom mark. When fitting to traveler cars, ensure adequate support for the bottom block and use stand-up spring kit RF324-1 or RF324-2. (Refer to traveler section for more information).
Applications
Materials
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Nice backpack
Color: Aa-black, Size: 14 Inch
Good quality backpack. Use it everyday for work and it’s very spacious.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 21, 2026
★★★★★ 5
Cute, functional bag that’s very stylish
Color: A-pinkish Grey, Size: 14 Inch
This little bag is so cute and fictional. It’s the perfect size and the color is gorgeous. Matches my style really well. It also is a smaller size that fits many things which is really hard to find. It’s always usually a bigger bag so I absolutely love this one and highly recommend it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 10, 2025
★★★★★ 3
Its ok
Color: Black, Size: 16 Inch
I ended up returning it as it wasn't quite what I needed. I actually thought the bag abd design were ok. Its not worth the price is paid either.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 13, 2026
★★★★★ 5
Feels great to wear!
Size: XX-Large, Color: Light Khaki
Love the feel of the fabric. Gives you room to breath and isn't tight feeling. I got the XXL and it fits perfect. I like the fact that this shirt can be either formal or everyday wear. It just all depends on what pants or shorts you want to wear with it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 27, 2026
★★★★★ 5
Great purchase for the price!
Size: Small, Color: Light Khaki
Very comfortable, color matched what was advertized, size fitted well. Overall a great purchase for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2026
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