3173 and 3174 high-load controls allow 2:1 to 6:1 purchases on offshore boats with mainsails over 37 m² (400 ft²). Controls feature 57 mm Black Magic Big Boat ball/roller sheaves and high-load aluminum sideplates.

• Maximum line Ø (mm) 12 mm
• Maximum line Ø (in) 7/16 in
• Maximum working load (kg) 750 kg
• Maximum working load (lb) 1650 lb
• Purchase 3:1 / 4:1

Big Boat CB traveler cars handle high loads on boats from 9.5 m to 15 m (32 to 50 ft) and up to 21 m (70 ft) with coupled cars. Harken ball bearing traveler and genoa lead cars with multipart purchases allow easy adjustment of loaded sails from the cockpit. Whether racing or cruising, these smooth-rolling systems pay huge dividends in sail control and are safer and faster than playing the sheet. CB wire retaining clips and composite corner keepers keep ball bearings captive when car is off the track. Track comes in low- and high-beam configurations.