Sprint Filter P08 F1-85 Air Filter for Racing – Triumph Thruxton 1200 TFC (2019–2021) PM217S F1-85

This is the machine in the family with the least use for a racing air filter, and saying so is more useful than pretending otherwise. The Thruxton TFC was a numbered limited series, built in small quantity and bought largely to be kept. Bikes like it cover modest annual distances, spend long spells standing, and are valued on originality as much as on how they ride. A medium developed to feed an engine that is stripped on an hours count is a strange companion for a motorcycle that may not see a thousand kilometres in a year. The part fits perfectly. The reasoning is what has to be checked.

Key Features

• Dry polyester, an 85 µm aperture, a 15,000 l/m²/sec rating: the Sprint Filter racing medium
• Standing still costs it nothing: never oiled, so nothing gums up, dries out or migrates downstream
• The 80 µm standard P08 filters finer; here the airflow is paid for rather than given
• It drops into the standard airbox with nothing cut, nothing repositioned and no remap
• Washable and reusable, so the original element can stay untouched on a shelf
• The purchase date starts a two-year warranty

Why the mismatch matters here

Coarse filtration is a debt that is repaid by maintenance. In racing the repayment happens automatically, because the top end is opened often and anything that got past the filter is found early. A limited-series road bike has the opposite maintenance profile: long intervals, few kilometres between them, and an engine nobody wants to open at all. On that profile the 80 µm P08 is the sensible choice — the same construction, the same washable dry polyester, one step finer, and rated at 5,050 l/m²/sec, which is more airflow than a standard Thruxton will ever call for. Where a bike lives near dust or gravel, the 14 µm P14 trades further still, down to 1,800 l/m²/sec. Finer holds more and flows less; that relationship is fixed, and picking a point on it is the entire decision.

If you fit it anyway, keep the original

There is a legitimate case: a TFC used at track days, or one whose engine is looked after on a racing schedule. In that case the change is worth knowing for what it is — entirely internal, invisible with the seat and airbox cover in place, and completely reversible. The factory element goes into a labelled bag, the standard cover closes on the new one unmodified. On a numbered bike, reversibility is part of the specification.

Care and cleaning

For the PM217S F1-85 the normal service is compressed air, applied from the clean side and directed outwards. The alternative is a wash in lukewarm water with a mild detergent, rinsed until the water runs clear, then a full dry in open air — never with heat, never with a flame. It is refitted dry, with no oil to reapply. Downloads is where the maintenance sheet is filed.

Fitment & Compatibility

Made for the Triumph Thruxton 1200 TFC, 2019–2021. The same element covers five machines built around this airbox — the Speed Twin 900 and Speed Twin 1200, and the Thruxton 1200 in R, RS and TFC form. The full list with model years is in the Fitment tab.