The facts.
DescriptionThe whole story▼
Two Triumphs are separated in the parts catalogue by the way a number is written. The Rocket III, built from 2004 to 2018, spells it in Roman numerals; the Rocket 3 that replaced it in 2019 uses a digit, and behind that quiet change of typography sit a new engine and a new airbox. Search engines, forums and second-hand listings treat the two spellings as interchangeable. Parts catalogues cannot, and this is the element for the earlier machine — the one whose badge reads III.
Key Features
- Single-layer woven polyester, run dry: 80 µm rating at 5,050 l/m²/sec
- Never oiled, so nothing has to be dosed, dried or reapplied after cleaning
- Takes the paper panel's place in the standard airbox: no modification, no remapping
- Around twice the working surface of a typical performance element
- Retains 93.13 % of 100-micron particles, against 76.42 % for four-layer oiled cotton
- Designed for the life of the motorcycle; two years' warranty from the date of purchase
Ordering a part for a fifteen-year-old flagship
The safest way to buy anything for this machine is by model year first and name second. A Rocket III can be a 2004 first-year bike or a 2017 final-run example, and the family took in Classic, Touring and Roadster versions along the way, so the badge on the tank is a poor identifier on its own. What does not vary across that span is the airbox: the CM232S covers the whole 2004 to 2018 window on one part number. Check the year on the documents, not the spelling in the advert.
What the element is for
Not power. Nothing dropped into an unmodified airbox makes a standard Rocket III quicker, and a machine with this much torque was never waiting on its filter. The element is about the condition of the intake over time: a lower starting restriction, restored at every cleaning rather than allowed to climb until a replacement is bought, and a piece of dry polyester that is regenerated with compressed air instead of ordered again. On a motorcycle no longer in production, a part that is serviced rather than consumed is worth something in itself.
Care and cleaning
Compressed air on the clean face, driven outwards, so that what the weave stopped leaves by its entry route. Lukewarm water with a little mild detergent will lift what stays behind; rinse until the water runs clear. Let it dry in moving air at its own pace — never with heat, a hot air gun or a flame — and refit it completely dry, with nothing applied to it. The maintenance sheet for the CM232S is in the Downloads tab of this page.
Fitment & Compatibility
The P08 element for the Triumph Rocket III, model years 2004 to 2018 — one airbox across the whole production run of the original machine. The Rocket 3 introduced for 2019 is a different motorcycle and takes a different element, so a bike from that year onwards is on the wrong page here.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Triumph Rocket III (2004–2018)
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