Reference
Leaders and tippet: the X system, simply
The connection between your fly line and your fly does more for presentation than the fly does.
What X means
Tippet is rated by diameter, not strength, on a scale where the bigger number is thinner: 0X is thick, 7X is gossamer. Breaking strain follows diameter but varies between materials, which is why two spools both marked 5X can differ by a pound or more.
A tapered leader steps down in diameter from butt to tip so that energy transfers along it and the fly turns over and lands ahead of the line rather than in a heap.
The rule of four
Divide the hook size by four and you have the finest tippet that will comfortably carry it. A #16 fly takes 4X; a #20 takes 5X. It is approximate and it works.
Too heavy and the tippet is stiff enough to stop a small fly moving naturally. Too light and you will break off on the strike, or in a fish. Err heavier in fast, coloured water and lighter in slow, clear water where the fish have time to look.
| Tippet | Approx. hook sizes | Typical use |
|---|---|---|
| 3X | #6–#10 | Streamers, hoppers, big nymphs |
| 4X | #12–#16 | General dry fly and nymph |
| 5X | #16–#18 | Smaller dries, clear water |
| 6X | #18–#22 | Midges, spring creeks, spooky fish |
Replace tippet, not leaders
Every fly change costs you a couple of inches. After a dozen changes the tippet section is short and thick and your presentation has quietly got worse without you noticing. Tie on a fresh length from the spool rather than buying a new tapered leader — it is the cheapest improvement available to most anglers.
Check for wind knots often. A knot in tippet reduces breaking strain by roughly half, and it will find you at the worst moment.