Sprint Filter P08 F1-85 Air Filter for Racing – Triumph Street Triple 660S (2017–2026) PM167S F1-85

A racing air filter is usually bought on a guess about how the motorcycle will be used, and guesses tend to be generous. One group of Street Triple 660S riders never has to guess. Machines that earn their keep on closed circuits collect more full-throttle minutes in a single week than a privately owned example manages in a year. That duty cycle is what the PM167S F1-85 is specified for, and everything below is written to help you place your own 660S on one side of that line or the other.

Key Features

• Dry woven polyester with the aperture opened to 85 µm, Sprint Filter's racing calibration
• Rated at 15,000 l/m²/sec, three times the flow of the standard road and track weave
• Never oiled and never impregnated, so nothing travels on to sensor or throttle bodies
• Around double the filtering area of rival performance elements in the unmodified airbox
• Drops straight into the series housing: nothing cut, nothing remapped, intake path untouched
• Washed rather than replaced, built to last the machine, two years of warranty from purchase

Counting hours, not seasons

A flow figure is a rate, redeemed only while the engine actually asks for full flow. In circuit use that happens in twenty-minute blocks, repeated until the track closes; on the road it happens in bursts of a second or two between junctions. The benefit scales with the first pattern and all but vanishes in the second, while the cost runs continuously: the wider aperture is open every second the engine turns. Read Sprint Filter's own comparison precisely: at the 100 micron size it measured, the racing weave held back 95.22 per cent against the standard weave's 93.13. What a wider aperture gives away sits at the fine end of the scale, where no comparison figure is published. A trade, then, and not a ranking.

Where most of these machines live

Most 660S are road bikes, and for a road bike the standard P08 in this same housing is the better specification. Nothing about the racing weave makes a series triple noticeably stronger; a panel element is the last and smallest link in a restriction chain that starts at the intake mouth. What it does deliver is an intake resistance that keeps returning to its starting figure instead of climbing towards the next service. If your riding puts real hours into high load on a circuit, that reserve earns its place. If it does not, it is capacity you will never draw on.

Care and cleaning

Servicing takes an air line and a few minutes: hold it to the clean face of the PM167S F1-85 and drive the dust out through the dirty side. After a wet or grimy season, lukewarm water and a mild detergent, rinsed until the water runs clear. Air drying only, never over a heater and never with a flame, and it goes back in dry. There is no oiling step at any stage. The maintenance sheet sits in the Downloads tab.

Fitment & Compatibility

Made for the Triumph Street Triple 660S, listed here from 2017 to 2026. The same element serves one further listing, the 765 Street Triple built on the same airbox. Check your model year in the Fitment tab before ordering.