Ratchet Blocks

Two Speed Mainsheet Systems


  •  Coarse and and fine tuning purchase system
  •  Unrivalled 18:1 holding power
  •  Dual sided On-Off switch
  •  Low friction ball bearing system
  •  Lightweight
  •  Cheek cut-outs for easy bearing maintenance

  Product No. Desc. Sheave ØMax. Rope ØMax. Cable ØPin ØM.W.L.B. L.Weight Price RRP
 RF72700 RF72700 3:1 coarse, 6:1 fine, Ratchet and Ball Bearing 75 + 5010--80017001490 $ 1,265.00
 RF72700B RF72700B Bottom blocks for RF72700 two-speed system 75 + 5010--8001700950 $ 764.12
 RF72700T RF72700T Top blocks for RF72700 two-speed system 75 + 5010--8001700560 $ 491.98
 RF72900 RF72900 4:1 coarse, 8:1 fine, Ratchet and Ball Bearing 75 + 5010--110023001610 $ 1,512.50
 RF72900B RF72900B Bottom blocks for RF72900 two-speed system 75 + 5010--110023001035 $ 874.50
 RF72900T RF72900T Top blocks for RF72900 two-speed system 75 + 5010--11002300575 $ 577.50


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 traveller cars, ensure adequate support for the bottom block and use stand-up spring kit RF324-1 or RF324-2. (Refer to traveller section for more information).


  • Two-Speed systems: Mainsheets on sportsboats and keel boats to 12m (40ft)


  • Carbon Black Acetal ball bearings
  • U.V. stabilised Acetal sheaves, alloy ratchet sheaves
  • Cheek plates: Anodised aluminium
  • Torlon® ratchet pawl
  • Adjustable cleat arms