Sprint Filter P08 F1-85 Air Filter for Racing – Triumph Thruxton 1200 RS (2020–2026) PM217S F1-85

The interesting property of a coarse weave is not what it does when it is new. It is what it does once it has been working for a while. A circuit hands a filter rubber dust and grit off the run-off areas. Every medium collects that load, and every medium gets more restrictive as it does — but the finer the aperture, the sooner a given quantity of debris starts to matter. At 85 µm the P08 F1-85 has more room to be dirty before its restriction moves, which is the real reason racing media are specified coarse. The Thruxton 1200 RS is the machine in this family most likely to see the conditions where that argument holds.

Key Features

• Sprint Filter's racing medium for the standard airbox: an 85 µm aperture, 15,000 l/m²/sec
• Coarser than the 80 µm P08, because filtration is what buys the airflow
• Dry polyester, never oiled: no film can be drawn onto the intake sensor or the throttle bodies
• It replaces the standard element directly, with no airbox modification and no remap
• Washable and reusable, with compressed air the whole service procedure
• Two years of warranty begin at the date of purchase

How a medium behaves as it loads

What separates one weave from another is the slope after that: how much the pressure drop climbs per gram of dust caught. A coarse aperture with a large filtering area — Sprint Filter fold roughly double the surface of other performance filters into the same standard housing — spreads that load thinly and moves slowly. That is worth having over a long, hot day where the last session should feel like the first. It is about staying constant, not about starting high.

The bill starts on the first lap

Whatever a coarser aperture lets through, it lets through from the moment it is fitted, not once it is dirty. Racing accepts that because a race engine is measured in hours and comes apart on that schedule; the particles that a finer weave would have held never accumulate long enough to reach a bore. A Thruxton RS ridden on the road, serviced on a kilometre-based schedule and expected to run for many years, sits on the wrong side of that calculation. For that bike the standard 80 µm P08 is the better answer, and where the roads are dusty the 14 µm P14 is better still. More retention costs airflow; less retention buys it. Neither one is the superior filter.

Care and cleaning

What makes this practical between two sessions is the speed: compressed air from the clean side outwards, and the PM217S F1-85 is back in the airbox in minutes. Anything more stubborn calls for water and a mild detergent, rinsed until the water runs clear. Drying is done fully in open air, never with heat and never with a flame, and the element goes back dry, nothing oiled at any stage. Under Downloads you will find the maintenance sheet.

Fitment & Compatibility

Made for the Triumph Thruxton 1200 RS, 2020–2026. 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.