⟲ 360° — drag meThe facts.
DescriptionThe whole story▼
A loading air filter never files a complaint, and the reason is the person on the seat. As the element fills, the engine wants the throttle a fraction further open for the same road speed; the hand supplies it without being asked, the motorcycle does what it always did, and nothing announces that anything has changed. The Meteor 350 runs from 2021 here, long enough for a first element to have gone quietly from new to well loaded without telling anybody. The Sprint Filter CM231S answers a part that will never report its own condition: one you look at, instead of one you wait to notice.
Key Features
- Dry woven polyester, single layer, 80 µm filtration at a rated 5,050 l/m²/sec
- Cleaned with compressed air and refitted, so looking inside the airbox commits you to nothing
- Never oiled: nothing to dose, nothing to wash back out, nothing to reach the sensors
- Around twice the filtering surface of other performance elements, in the standard airbox
- Direct replacement for the paper panel — no airbox modification and no remap
- Intended to last the life of the motorcycle, with two years of warranty from purchase
The fault that files no report
Most worn parts on a motorcycle make themselves known. A chain gets noisy, pads squeal, a tyre changes the way the bike turns. The intake has no equivalent, because the rider sits inside the control loop and compensates without deciding to. The fuelling covers the remainder, trimming the mixture back where it belongs. Between them, hand and map absorb a good deal of restriction — and what they absorb, they also conceal.
Which leaves inspection as the only instrument
A part that cannot be noticed has to be scheduled instead, and schedules are only kept when checking is easy. That is where a washed panel parts company with a thrown-away one. Opening the airbox on a paper element is worth the trouble only with a replacement on the shelf; on the CM231S the same look ends either with the element going straight back in, or with a few minutes and an air line. Neither outcome costs anything. To be plain about the rest: a drop-in filter does not make a standard 350 single noticeably stronger. What it changes is how much of each interval is spent near the clean end of the curve.
Care and cleaning
Compressed air from the clean side, directed outwards through the weave, is the standard service. A wet or salty season earns more: lukewarm water, a little mild detergent, a rinse until the run-off is clear. Drying is done by air alone — never heat, never a flame, since both destroy polyester — and the element goes back in dry, with no oil or spray of any kind. The maintenance sheet for the CM231S sits in the Downloads tab.
Fitment & Compatibility
For the Royal Enfield Meteor 350 built from 2021 to 2026, the longest run of any machine on this part number. The element is shared with the Bullet 350 (2023–2026), the Classic 350 (2022–2026), the Goan Classic 350 (2025–2026) and the Hunter 350 (2022–2026): five motorcycles, one element. Model years are listed in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Royal Enfield Bullet (2023–2026)
- Royal Enfield Classic (2022–2026)
- Royal Enfield Goan Classic (2025–2026)
- Royal Enfield Hunter / Hntr (2022–2026)
- Royal Enfield Meteor (2021–2026)
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
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Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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