The facts.
DescriptionThe whole story▼
A product name and a retention figure are not the same thing, and this element is the proof inside Sprint Filter's own range. The 85 in F1-85 reads like a rating coarser than the 80 microns of the standard element for the same airbox, yet it is no pore size at all — and on the same test, with 100-micron particles, the racing weave retains more: 95.22 % against 93.13 %. A filter medium is not a sieve with one number, and a figure in a name does not predict the result.
Key Features
- Dry woven medium, threads from 22 µm across, rated at 15,000 l/m²/sec
- Measured retention of 95.22 % on 100-micron particles
- No oil in the specification, on delivery or after any wash
- Seats in the unmodified Flame airbox: no cutting, no adapter, no remap
- Around twice the filtering surface of a conventional flat element
- Cleaned and refitted instead of replaced, two years of warranty from purchase
Why the two numbers do not track each other
Retention is a property of the medium as it is built — how the threads are laid, how deep the path through them is, how particles behave once they are inside it — while the aperture describes one dimension of the geometry. Change the weave and both move, but they do not move together, and neither can be calculated from the other. This is the reason the range cannot be read as a ladder from coarse to fine: the numbers that matter are measured for each medium separately, and the catalogue prints them rather than deriving them.
What that means for a Flame
Practically, it means this element is not a compromise version of the standard one, and it is not a fine one either — it is a different medium with its own two figures. The rest of the proposition is familiar: dry construction, nothing to spray, nothing to migrate onto an intake sensor, and a panel that is washed rather than bought again. And it is not power. In an unmodified airbox the CM136S F1-85 leaves a standard Flame exactly as strong as it was; what an owner gets is a lower and steadier intake restriction across the service interval, at roughly two and a half times the price of the standard weave.
Care and cleaning
Compressed air on the clean face, worked outwards, is the routine service. After a dirty season lukewarm water and a mild detergent do what air will not, rinsed until the runoff is clear. Dry the panel in moving air at room temperature and in no other way — heat guns, radiators and flames destroy a woven medium invisibly. It goes back in dry, with nothing applied to it. The full maintenance sheet sits in the Downloads tab.
Fitment & Compatibility
Made for the Gaokin Flame of 2017–2026, seated in the series airbox without modification. This code covers two machines, the Flame and the Brixton Crossfire/X built around the same housing. Check your build year in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Brixton Crossfire/X (2017–2026)
- Gaokin Flame (2017–2026)
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