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Description
Ronstan Series 75 Ratchet and Ball Bearing Block w/ 4:1 Coarse & 8:1 FineProduct Description Ronstan Series 75 Ratchet and Ball Bearing Block w 4: 1 Coarse & 8: 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. 2430 lb. B. L. 5070 lb. Weight 53. 8 oz. Product Information Two speed mainsheet
Product Description
Ronstan Series 75 Ratchet and Ball Bearing Block w/ 4:1 Coarse & 8:1 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. - 2430 lb.
B. L. - 5070 lb.
Weight - 53.8 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. (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 = 42sq m (452 sq ft)
Max. mainsail area, MID boom sheeting = 27sq m (290 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
4.8 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Holds up really well under an extreme chewer
Size: Dumbbell
My dog is only 18 lbs , he can chew through anything. This little not so little chew toy has held up really well and keeps him occupied... although the blue rubbery part does break off in little tiny pieces it is not breaking off in big chunks, it has lasted more than 2 months at this point. He has been able to put some dents and dings in the plastic Center, but again considering he destroys everything in a matter of moments I'm very pleased with this. Quality is good, and he likes to carry it around the house... also found out if he turns it it makes a funny little noise which keeps them entertained. Perfect size for my dogs. The wait is Hefty enough that he knows he's carrying it but not so big and weighted that he doesn't enjoy it.
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Reviewed in the United States on August 12, 2025
★★★★★ 1
Won’t buy again
Size: Tripod, Size: Tripod
It started out great. But then it came apart and my puppy almost swallowed the piece that makes noise. Otherwise, it’s been a good brand of bones. Just not this particular one. The end unscrews and came apart. Not great!
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Reviewed in the United States on January 20, 2026
★★★★★ 3
Inside has liquid and dog got to it in just 2 days
Size: Tripod
Dog chewed up in few days and got the liquid inside open. They did love chewing he toy but I worried about it coming apart in pieces. So for my dog value for money isn't there if gets apart so quickly
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Reviewed in the United States on June 16, 2025
★★★★★ 4
Not for super aggressive chewers
Size: Tripod
Had high hopes, but our super-chewer somehow manages to UNSCREW the ends of the toy. Had to throw it out so she wouldn’t choke
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Reviewed in the United States on August 24, 2025
★★★★★ 5
Excelente
Size: Dumbbell
Mi perro lo ama
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Reviewed in the United States on April 10, 2026