The facts.
DescriptionThe whole story▼
Indian has put the Chieftain name on its baggers for years, and a name with that much history is a poor guide in a parts catalogue. Sprint Filter lists PM237S for the Chieftain built in 2025 and 2026 only, the generation that sits on the same element as the Challenger family. No earlier Chieftain appears on this code. So the first step with this panel is not choosing a medium. It is reading the model year off the registration document and matching it to the fitment list, because the badge on the fairing stayed the same while the hardware behind it did not.
Key Features
- One dry layer of woven polyester, rated at 80 µm
- 5,050 l/m²/sec of rated flow through clean cloth
- Polyester threads from 22 µm across: the fibre gauge, not the opening between fibres
- 93.13 % of 100-micron particles held in the maker's test, against 76.42 % for four-layer oiled cotton
- About twice the filtering surface of other performance filters, in the original frame shape
- Replaces the paper panel in the unaltered airbox, no remap; two years of warranty
Why the year matters more than the name
Filter codes follow housings, and a housing changes when a manufacturer redraws what sits around the engine. When the Chieftain moved onto the shape of PM237S for 2025, its filter changed with it, and nothing on the outside of the motorcycle announces that. Ordering by name alone is how an owner ends up holding a panel that is correct for somebody else's Chieftain. Ordering by year and code avoids it. If the panel in your airbox looks different from the one pictured, compare the two before fitting rather than after.
What it changes, and what it does not
PM237S is the standard medium of this housing, a dry weave for road riding with flow held in reserve. It does not make a standard Chieftain noticeably stronger; no element in an untouched airbox does that to a series engine. What it changes is the course of intake restriction over time: low at fitting and returned to that level at every cleaning, instead of climbing until a paper panel is replaced. The second medium catalogued for the Chieftain is the P14 nonwoven at 14 µm. It is the better choice where the bike regularly runs in dusty air; on clean tarmac it gives up flow for protection that is not needed, so the woven panel is the right default.
Care and cleaning
Blow PM237S through with compressed air from the clean side outwards, so the collected dirt leaves the way it came. Residue that air will not move comes off in lukewarm water with a mild detergent, rinsed until the water runs clear. Let it dry at room temperature in moving air, never with a heat gun, a radiator or a flame, and refit it dry with nothing applied. The maintenance sheet is in the Downloads tab.
Fitment & Compatibility
For the Indian Chieftain built from 2025 to 2026, seated in the series airbox without modification. Six machines share this element: the Challenger, Challenger Dark Horse and Challenger Limited of 2020–2026, the Pursuit of 2022–2026, and the Chieftain and Roadmaster of 2025–2026. Confirm your model year in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Indian Challenger (2020–2026)
- Indian Challenger Dark Horse (2020–2026)
- Indian Challenger Limited (2020–2026)
- Indian Chieftain (2025–2026)
- Indian Pursuit (2022–2026)
- Indian Roadmaster (2025–2026)
- Indian Challenger 1890 (2020–2026) · own page →
- Indian Challenger Dark Horse 1890 (2020–2026) · own page →
- Indian Challenger Limited 1890 (2020–2026) · own page →
- Indian Pursuit (2022–2023) · own page →
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