Sprint Filter P08 F1-85 Air Filter for Racing – Triumph Daytona 660 (2024–2026) SM280S F1-85

There is an order to a competition build, and the air filter comes near the end of it. Cams, exhaust, throttle bodies and the calibration that ties them together create demand; the intake medium only decides how easily that demand is met. Bought first, on an otherwise standard Daytona 660, the F1-85 is headroom with nothing asking for it — and not a free purchase either, at roughly two and a third times the standard P08 for this machine.

Key Features

• Dry polyester racing medium: 85 µm rating at 15,000 l/m²/sec
• Roughly three times the rated flow of the standard P08 medium, at a coarser weave
• Measured at 95.22 % retention of 100-micron particles, against 93.13 % for the P08
• Never oiled — no film to apply, and nothing to migrate into the intake tract
• Fits the standard airbox in the original position, with no modification to the housing
• Cleaned with compressed air and refitted; two years' warranty from the date of purchase

Where this element belongs in the sequence

By Sprint Filter's own account this is the sort of medium that dominates the grids in MotoGP, Moto3, World Superbike, Supersport and Superstock — a manufacturer's claim rather than an independent measurement, though a plausible one, since racing engines are stripped often enough that filtration is a shorter-term problem than it is on the road. That is the context the SM280S F1-85 comes from. On a standard road Daytona 660 it adds no power and changes nothing you can feel: the engine asks for what it asks for, and it was never being starved. Fitted after the work that raises the demand, it is the airbox catching up with the rest of the engine.

Reading the two numbers honestly

Between the P08 and the F1-85 the rating moves from 80 to 85 microns while rated flow moves from 5,050 to 15,000 l/m²/sec. The two figures do not move at the same rate, and that asymmetry is the whole argument for the medium. The retention figure above helps less than it looks: 95.22 % against 93.13 % is measured on 100-micron particles, larger than either rating, and says nothing about the fine fraction, where the coarser weave is the one giving ground. A coarser medium passes more and holds back less — the swap, stated plainly.

Care and cleaning

Compressed air from the clean side outwards, so the dust exits the way it entered. Water and a little mild detergent when air alone is not enough, then rinse until it runs clear. Never dry it with heat or a flame, because the medium distorts, and never refit it damp or treated with anything. Between sessions the compressed-air line already in the paddock is all it needs. The maintenance sheet for the SM280S F1-85 is in the Downloads tab of this page.

Fitment & Compatibility

The F1-85 element for the Triumph Daytona 660, model years 2024 to 2026. One machine, one airbox: the same housing takes the standard P08 and the fine P14, so the choice of medium stays reversible and nothing about the installation differs between them.