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Description
Ronstan Series 75 Top Block for RF72700 Twinspeed SystemProduct Description Ronstan Series 75 Top Block for RF72700 Twinspeed System 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 19. 8 oz. Product Information Two speed mainsheet systems allow both coarse and fine
Product Description
Ronstan Series 75 Top Block for RF72700 Twinspeed System
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 - 19.8 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.
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.
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
4.8 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Perfect suit
Color: Wine Red, Size: X-Large, Color: Wine Red, Size: X-Large
I love the suit it fitted my son perfect
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 5
Omg absolutely stunning!!!
Color: Blue, Size: X-Large, Color: Blue, Size: X-Large
I purchased this suit for my son‘s prom and I must say I know he was going to be the most handsome young man there!!! It fit to size, the quality was good, and the royal blue was popping! I would highly recommend!
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Outfit for prom, worked perfectly!
Color: Blue, Size: Medium
Very nice, no problems!!
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Snazzy!
Color: Wine Red, Size: X-Large
Fit was perfect and everyone gave lots of compliments!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 22, 2026
★★★★★ 5
Great buy!
Color: Black, Size: Small
My husband looked amazing in this! The fabric is gorgeous and it fits true to size.
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Reviewed in the United States on January 27, 2026