Fishing Weights: How to Choose the Right Size in 2026
Fishing weights decide whether your bait sits still on the bottom or rolls away with the tide, and getting the size wrong is the fastest way to lose fish and tackle. This guide covers how to pick the right fishing weights for surf, river and lake rigs in Ireland in 2026.
- A Diamond Sea Lead at 100g to 200g holds bottom in strong Irish surf - buy heavier on spring tides.
- Split shot in four sizes (dust, BB, AAA, SSG) covers most freshwater float rigs - stock all four.
- Match fishing weights to your rod's printed casting rating first, not to the biggest lead in the shop.
- Tungsten costs more per gram than lead but sheds bulk in snaggy, weedy ground - worth it there.
Why this matters
A rig only works if the weight holds it where you cast it. Too light and a running tide drags your bait into the rocks; too heavy and a light rod loads wrong, cutting your distance by metres on the forward cast.
On Irish beaches, tidal pull can shift hard between neap and spring tides, and the same lead that sat still last week rolls on the next trip out. Freshwater rigs face the opposite problem - overloading a light spinning rod with a heavy leger weight kills bite detection on pike and bream alike.
A Diamond Sea Lead at 100g to 200g holds bottom in strong surf, while a 10g drilled bullet does the same job on a calm canal or drain. Get the fishing weights wrong once and you spend more of the session re-rigging than fishing.
What you'll need
- A rod with a printed casting weight rating, usually stamped near the handle
- Split shot in four sizes: dust, BB, AAA and SSG, for float rigs
- Drilled bullet weights, 10g to 40g, for freshwater legering
- Sea leads, 100g to 200g or more, for beach and boat casting
- Swivels, beads and rig tubing to stop the weight sliding onto your knot
- A luggage or kitchen scale if your leads aren't marked in grams
The steps
1. Read your rod's casting weight rating before you buy anything
Every rod blank has a printed range - something like 15g to 60g on a light spinning rod. Go past the top figure and you risk cracking the blank on the forward cast; go too far under it and the tip won't load, so the cast falls short by several metres.
Common mistake: buying the heaviest lead in the shop "to be safe". That's the surest way to snap a light rod on the first proper cast of the day.
2. Match weight to current and depth, not just distance
Fast-flowing Irish rivers need more weight to hold bottom than a still lake at the same depth. Wind at the coast adds resistance mid-flight too, so beach rigs run heavier than the same water depth would suggest inland.
3. Pick the weight style for the rig you're actually fishing
- Split shot for float fishing - pinch on two or three small shot rather than one big one, so the float stays balanced and sensitive.
- Drilled bullet or bomb for freshwater leger and feeder rigs - runs inline above a swivel, free to slide on a running rig.
- Grip or breakaway sea leads for surf work - the wires dig into sand and hold against tide until a fish pulls the line straight.
For a full breakdown of rig setups for distance casting, the beachcasting guide for beginners covers rod, reel and lead pairing in more detail.
4. Account for line diameter and drag
Braid cuts through water with less drag than mono at the same breaking strain, so a braided setup can often run 10g to 20g lighter and still hold bottom in the same current. Thicker mono needs more weight to compensate for that extra drag.
5. Cast-test before you commit to a rig for the day
Load the weight and take two or three practice casts on grass before you're standing on the mark. If the rod tip doesn't load properly, or the cast feels noticeably short, drop 10g and try again rather than forcing it.
6. Switch to tungsten when bulk becomes the problem
Tungsten runs roughly 1.7x denser than lead, so the same weight takes up less space - a real advantage in snaggy, weedy ground where a bulky round lead catches on every retrieve. It costs more per gram, but for rock marks or heavy weed it pays for itself in fewer lost rigs across a season.
7. Rig the weight so it doesn't kill bite detection
Running leger setups - weight free on the line above a bead and swivel - let a fish move off with the bait before it feels any resistance. Fixed rigs telegraph that resistance straight through the line, and a cautious fish will often drop the bait. For pike, bream and most stillwater species, running beats fixed almost every time.
Troubleshooting
- Rig keeps rolling in a strong tide - step up to a breakaway or grip lead with longer wires, not just a heavier round lead.
- Bites aren't registering on a leger rig - the weight is too heavy or fixed; switch to a running rig with a lighter bullet.
- Losing weights on snaggy ground - use a weak link or lead clip so only the weight sacrifices on a snag, not the whole rig.
- Casts falling short of where they used to - check the weight against the rod's rating; you may be underloading the tip.
- Line twisting just above the weight - add a swivel between the weight and the hook length.
- Weight sliding down and jamming the knot - add a bead between the weight and swivel to cushion the impact.
Tools and resources
- A sea lead rated for your mark, such as a Diamond Sea Lead at 100g-200g for surf work
- A rod with a clearly printed casting weight range, checked before you buy any lead
- A mixed split shot dispenser covering dust through SSG for float days
- The beachcasting guide already linked above for full rig diagrams
- A line diameter check against your target depth and current before picking a weight
What to do next
Once your fishing weights are dialled in, the next place rigs fail is the line pairing them - mismatched diameter either kills casting distance or snaps on the strike. Sort that next, then look at rod choice for the specific water you're fishing most in 2026.
FAQ
What's the best fishing weight for beach fishing in Ireland?
A grip or breakaway sea lead between 100g and 200g is the standard for Irish beach fishing in 2026, with heavier leads needed on spring tides or exposed marks. Match the lead to your rod's top casting rating so you don't overload the blank.
How much weight do I need for float fishing?
Most float rigs need somewhere between a single BB shot and four to six AAA shot, spread along the line to balance the float rather than bunched in one spot. Start light and add shot until the float sits with just the tip showing.
Is tungsten or lead better for fishing weights?
Tungsten is denser than lead, so it takes up less space for the same weight, which matters in snaggy or weedy ground. Lead is cheaper and works fine in open, clear-bottomed swims where snags aren't a factor.
How much does a fishing weight cost in Ireland?
Split shot and small leger weights cost a few euro for a mixed pack, while sea leads and specialist tungsten weights run higher per piece depending on size. Check current pricing in-store or online, as it shifts with metal costs.
What size fishing weight for pike fishing?
Pike legering rigs typically run 20g to 40g drilled bullets on stillwaters, moving up if you're casting long range on a big lake. A running rig with a bead above a swivel keeps resistance low so a picking-up pike doesn't feel the weight.
Can I use lead weights in Irish lakes?
Lead weights roughly between 0.06g and 28g are restricted on Irish inland waters under wildlife legislation because of swan poisoning risk. Use tungsten or steel alternatives in that size range for split shot and small legers.
How do I stop losing fishing weights on snags?
Rig a weak link or lead clip so the weight breaks free on a snag before the rest of the rig is lost. This keeps hooks, swivels and line intact even if the lead itself gets left on the bottom.
Does line diameter affect what weight I need?
Yes, thicker line creates more drag in current, so a braid setup can often run 10g to 20g lighter than the same rig on mono and still hold bottom. Check your line's diameter against your target depth and current speed before choosing a weight.
One last thing
Lead weights between roughly 0.06g and 28g are restricted on Irish inland fisheries under wildlife legislation because of swan poisoning risk - if you're pinching on split shot for a stillwater pike or coarse session in 2026, check you're using tungsten or steel in that range, not lead. It's an easy rule to forget when you're restocking a tackle box in a hurry.