The facts.
DescriptionThe whole story▼
The RTR 310 is the naked version of the Apache RR310, and much of its home market rides through a monsoon season every year. That raises an obvious question about an air filter: what happens when it gets wet. For PM189S the answer is plain. It is woven polyester; it does not swell or soften the way paper does, and once dry it is exactly what it was before. What it is not is water-repellent. Sprint Filter makes a water-repellent medium, the P037, but does not list it for this housing, so keeping water out remains the job of the airbox and the intake routing, as it is with the paper panel.
Key Features
- Single layer of dry woven polyester, 80 µm, 5,050 l/m²/sec
- Polyester threads from 22 µm in diameter that keep their shape when wet
- 93.13 % retention on 100-micron particles, against 76.42 % for oiled cotton
- No oil to wash out in rain or to re-apply after cleaning
- Direct replacement in the RTR 310's series airbox, no modification, no remap
- About twice the filtering surface of other performance filters; two-year warranty
After a wet season
Rain itself is not the problem; what it carries is. Spray from the road leaves a muddy film on everything it reaches, and water that finds its way into an airbox brings fine silt with it. An element that has lived in that air deserves a look when the season ends. If it is merely damp, let it dry before the next ride. If a film has formed, it gets washed. A paper panel in the same state would be thrown away; this one is cleaned and goes back in.
What it does, and the other two media
PM189S does not make a standard RTR 310 noticeably stronger, and no drop-in element does. It keeps the intake restriction low and steady between services and replaces a consumable with a part that is cleaned. Two other media are listed for the RTR. The P14 nonwoven at 14 µm suits dusty roads and costs almost exactly the same as this panel. The F1-85 racing weave costs about three times as much and belongs on track. The T12 of this family is listed for the BMW G 310 GS only, not for the RTR.
Care and cleaning
Routine cleaning of PM189S is compressed air on the clean face, worked outwards. For a muddy film, wash it in lukewarm water with a mild detergent and rinse until the water runs clear. Dry it at room temperature in moving air and never hurry that with heat or a flame. Refit it dry, with nothing applied. The maintenance sheet is in the Downloads tab.
Fitment & Compatibility
For the TVS RTR 310 of 2023–2026, fitted in the series airbox without modification. This code covers four machines: the RTR 310, the Apache RR310 of 2018–2026 and BMW's G 310 R and G 310 GS of 2017–2026. Check your build year in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- BMW G 310 GS (2017–2026)
- BMW G 310 R (2017–2026)
- TVS Apache RR310 (2018–2026)
- TVS RTR 310 (2023–2026)
- BMW G310GS (2017–2026) · own page →
- BMW G310R (2017–2026) · own page →
- TVS Apache RR310 (2018–2026) · own page →
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