Spice Sailing and Marine Ropes

For a dinghy halyard, you want low stretch and light weight. A polyester braid or, for performance sailing, a Dyneema-core rope with a polyester cover is the go-to choice. The Dyneema core virtually eliminates stretch, so your sail goes up tight and stays there when the breeze builds. For class racing, always check your class rules, as some specify maximum Dyneema content or minimum diameter.

Both are Dyneema grades, but SK99 has a higher tenacity and better creep resistance than SK78, meaning it holds its length under sustained load more effectively. For most dinghy applications, SK78 gives you an excellent strength-to-weight ratio at a lower price. SK99 becomes worth the extra cost when you need the absolute minimum stretch, such as in a heavily loaded control line on a performance skiff or keelboat.

Diameter is determined by two things: the load the rope will carry, and the cleats and blocks it needs to run through. Most cam cleats work best with 4 to 6mm rope, while a mainsheet on a double-handed dinghy typically wants 8 to 10mm for comfortable grip. If you are replacing an existing rope, match the original diameter as a starting point. You can also check our boat-specific rope length guides, which list both the correct length and diameter for each rope on a wide range of classes.

You can buy rope cut to whatever length you need. All ropes on this page are available by the metre, and we cut and seal each end to prevent fraying before dispatch. If you need larger quantities, 50m and 100m reels are available and work out better value per metre. We also stock mini spools for ropes you use in small amounts across multiple jobs.

There is no fixed rule, but two things to look for are wear and UV degradation. Feel along the rope for flat spots, stiff sections, or a crunchy texture inside the braid. These are signs the fibres are breaking down. On an actively raced boat, control lines typically last one to two seasons depending on use. Halyards often go longer but check the sections that run through clutches and over sheaves, as those spots take the most wear. When in doubt, replace it: a failed rope at the wrong moment costs far more than the rope itself.