Fly Reel Size Guide: How to Match a Reel to Your Rod

Short answer: match the reel to the line weight

Fly reels are not sized in inches or ounces the way a spinning reel is sold. They are sized by the fly line weights they are built to hold. The weight of your rod is printed on the blank just above the handle. Find a reel whose stated range includes that number and you have the right size class. If you are still deciding on a rod weight, our fly rod weight chart guide covers that step first.

Two things make "right size" slightly fuzzier than it sounds. Makers name their sizes differently, and the same line weight can sit in a small-arbor reel or a large-arbor reel with different capacity. So the process has two parts: pick the line weight range, then check the capacity table.

How reel sizes work

Slash numbers are ranges. A reel marked 5/6 or 7/8 does not mean five-sixths of anything. Orvis says the figure "isn't actually a fraction": it is the span of line weights the reel accepts. A 5-weight rod can sit happily with a 4/5 or a 5/6 reel, and a 9-weight rod calls for an 8- to 10-weight reel depending on your preference.

Some makers use their own scale. Orvis, for instance, sizes its reels with Roman numerals from I to V, and says each size coordinates with a line-weight span: I for 1 to 3, II for 3 to 5, III for 5 to 7, IV for 7 to 9 and V for 9 to 11. Other brands use a different system. Whatever the label, look for the line-weight range in the specs, because that is the part that stays comparable between makers.

Capacity is the other half of size. The maker's capacity table lists how much backing fits with each line weight and backing type. Capacity changes with arbor design, so a "5/6" from one maker can hold noticeably more or less backing than a "5/6" from another. The table or the reel box is where to look.

What arbor size changes

The arbor is the central hub of the spool. Fishwest's guide splits reels into three groups and describes them this way:

• Small arbor: light, well suited to trout rods, slower line retrieval.
• Mid arbor: faster pickup than small arbor, low profile, and light enough for rods up to a 6-weight. The article calls it the most popular trout reel size now.
• Large arbor: developed for saltwater, retrieves line up to nearly three times as fast as a small arbor, and is bigger and heavier, which can unbalance light trout rods.

Orvis lists the benefits of the large-arbor design as less reeling to retrieve line, more backing and room for thicker lines, fewer tangles and a more consistent drag. Feather Craft adds that large arbors keep line in looser coils, which means less memory. Sources do not agree on everything. Feather Craft says a large arbor holds less backing than a mid arbor at the same reel size and weighs more, while Orvis says large arbors hold more backing. I read that as: it depends on the model. Go to the reel's capacity table and its weight figure, not to the arbor label alone.

In our fly reel tables the Arbor column shows what the maker or listing states, and the small mark beneath each value tells you where it came from: maker means the manufacturer's own page, listing means the Amazon listing only, and a dash means we could not confirm it. We do not guess a missing arbor from a similar-looking model.

Balance: why reel weight matters on a light rod

A reel that is too heavy for the rod makes the outfit tip-back and tiring, and the reel is the counterweight for the whole rig. That is the reason Fishwest cautions about large arbors on 3- to 6-weight trout rods. For small water, check the Reel weight column before arbor size. Our trout fly reels page is the place to compare light options. (A reel that is a few ounces heavier than the one you wanted is a rounding error in the shop and a wrist problem by the afternoon.)

When to size up

Orvis gives three situations where it suggests a larger reel than the rod weight alone would call for:

1. Saltwater. The extra spool room holds more backing for long runs.
2. Your line weight sits at the edge of a reel's range. Moving up gives breathing room.
3. Streamer fishing with a streamer-specific line or longer sink tips, since bulkier lines take more room.

For saltwater there is more to it than size, such as sealed drag. Our saltwater fly reels page covers that.

Drag in one paragraph

Fishwest describes two main types. A click-and-pawl uses gears and a spring or band for a steady, light resistance, with little adjustment and a clicking sound. A disc drag works like a car brake: a knob raises the pressure on the line. Click-and-pawl suits anglers who palm the reel rim and feel the fish, and a disc drag suits anglers who set the pressure and land fish quickly. Orvis advises erring toward a slightly looser drag, since the right setting depends on the species, the water and the tippet. Our click-and-pawl fly reels page lists that style.

How much backing to plan for

MidCurrent says a 4- or 5-weight trout reel usually takes around 100 to 125 yards of backing, with room left for the fly line, and that trout seldom test that. It names salmon, big lake trout and musky as the few freshwater fish that can run off a large share of it. For a full explanation, see how much backing on a fly reel. You can also read about the backing itself on our fly line backing page.

Quick checklist before you buy

• Read the line weight printed on the rod.
• Choose a reel whose stated range includes it.
• Check the capacity table for your line weight and backing.
• Compare the reel weight with the rod's weight class.
• Decide on drag type and whether the reel will see salt.
• Look at the best fly reels list if you want a short list built from published specs.

Fish don't read spec sheets. You should.