The facts.
DescriptionThe whole story▼
Twice the filtering surface reads like a claim about how much dirt an element can hold before it gives up. It is also a statement about how hard each square centimetre of cloth works while the bike is moving: spread the same airflow across twice as much fabric and every part of it passes half as much air and gathers half as much of what that air carries. On a TRK 502 that is the figure worth having. This is a motorcycle bought to cover ground: the load arrives steadily over hours rather than in bursts, and the question is never whether the panel copes on the day it is fitted, but how far the restriction has drifted by the time the lid comes off again.
Key Features
- Single layer of woven polyester, dry from first fitting to last, rated at 80 microns
- 5,050 l/m²/sec of rated flow — the medium designated for road and track use
- Roughly double the filtering surface of a conventional performance element
- Drops into the untouched series airbox of the 502; nothing trimmed, nothing recalibrated
- Regenerated with compressed air instead of replaced, for as long as the bike runs
- Two-year warranty, with a service life specified as that of the motorcycle
Why area, not aperture, governs the interval
The 80-micron rating describes what the weave stops. The area describes how long stopping it stays cheap. Two panels of identical cloth hold back the same particles, but the smaller one reaches any given pressure drop sooner, because every part of it is carrying more. Be exact about what that delivers, though: not power. A slot-in filter does not make a standard TRK 502 noticeably stronger, whatever the packaging of intake parts suggests. It delivers a restriction that starts low, rises slowly, and goes back to where it began every time the panel is cleaned.
What the polyester actually is
Threads of 22 micrometres in diameter and upwards, woven into an even mesh rather than matted together, and left completely dry. The evenness matters for the argument above: a woven cloth filters at the same rating across its whole face, so the extra surface is genuinely extra rather than a patchwork of easy and difficult places. Being dry brings its own consequences — no oil to reapply, none to be over- or under-applied, nothing to travel downstream on a hot day.
Care and cleaning
Set the air line against the clean face and work outward, so the load leaves the weave by the path it took getting in. That is the whole of a routine service. When a greasy haze survives the air, hand-warm water and a little mild detergent will lift it; rinse until the water runs clear. Dry it in moving air and nothing warmer: no hot-air gun, no radiator, no flame, because heat is what destroys polyester while dirt merely sits on it. The SM211S goes back in dry and untreated, and its maintenance sheet is filed under the Downloads tab on this page.
Fitment & Compatibility
Cut for the airbox of the Benelli TRK 502 and TRK 502 X as built from 2017 to 2026, one element per machine. This code covers that model alone; check your year against the fitment list before ordering.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Benelli TRK 502/X (2017–2026)
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