Sprint Filter P08 F1-85 Air Filter for Racing – BMW R 1300 RS (2025–2026) SM294S F1-85

An engine does not take in volume, it takes in mass, and the mass in a given volume of air is set by two things the filter has no say in: temperature and pressure. That is an awkward fact for any intake part sold on flow. A faired sport-tourer sits close to the heart of it, because bodywork that shelters the rider also manages where warm air goes, and a hot afternoon behind a fairing shifts the density of the charge far more than any change of medium can. SM294S F1-85 is worth considering with that hierarchy in mind.

Key Features

• Dry racing weave in polyester, filtration rated at 85 microns
• Flow of 15,000 l/m²/sec, around three times the standard weave
• Retention of 95.22 per cent on 100-micron particles as tested
• Entirely oil-free, so nothing can be carried onto the sensors
• Standard airbox and standard mounting, no fuelling changes
• Washable, reusable and covered for two years

The variable the element does not touch

Intake air temperature is decided by ambient conditions, by where the box draws from and by how much engine heat is trapped under the bodywork at low speed. None of that changes when the panel changes. A racing weave lowers the resistance of one link in the chain; it does not cool the air, does not pressurise it and cannot compensate for a traffic queue in July. This is also the plainest way to say the necessary thing: no element inside a series airbox makes an R 1300 RS noticeably stronger, and on a touring machine the conditions that really move the needle are the ones nobody sells parts for.

Where the racing cloth still earns its place

In sustained high-load use, which for this pair of machines is a rarity rather than a routine. The medium screens at 85 microns and flows 15,000 l/m²/sec, against 80 microns and 5,050 for the standard weave: coarser and freer on one side, finer and more restrictive on the other, an exchange rather than a hierarchy. Sprint Filter measured 95.22 per cent retention of 100-micron particles for it and describes it, in its own words, as the most widely used medium in MotoGP and World Superbike. For this housing it asks close to two and a quarter times the price of the standard element, which is the honest measure of how specialised it is.

Care and cleaning

Compressed air from the clean side of SM294S F1-85 outward, never against the loaded face, clears the weave. Water with a mild detergent follows if a season demands it, and the element is rinsed until it runs clear. Drying is done by moving air alone, with no heat gun, no flame and no hot surface anywhere near it, and it goes back dry and unoiled. The cleaning sheet is attached in the Downloads tab.

Fitment & Compatibility

For the BMW R 1300 RS and the R 1300 R of 2025 and 2026, fitted in the series airbox with nothing modified. Two machines share this number; the R 1300 GS does not. The Fitment tab lists both with their year spans.