Sprint Filter P08 F1-85 Air Filter for Racing – Triumph Thruxton 1200 R (2016–2020) PM217S F1-85

The Thruxton 1200 R went out of production in 2020, and that changes the arithmetic behind a filter more than it looks. An air filter is insurance, and the engine pays the excess. While a model is current, the excess is a warranty claim and a parts counter that has everything on the shelf. A few years after the last one was built, it is a search for pistons, liners and a machinist who will do the work. That is the frame in which the P08 F1-85 should be judged on this bike: a dry polyester racing medium with an 85 µm aperture and a 15,000 l/m²/sec rating, one step coarser than the 80 µm standard P08 and roughly three times its airflow figure.

Key Features

• Sprint Filter's racing medium, developed for maximum airflow: 85 µm at 15,000 l/m²/sec
• One step coarser than the 80 µm P08 — retention is the currency, and flow is what it buys
• Dry polyester that is never oiled, so no oil film travels downstream onto the sensors
• It replaces the standard element in the standard airbox, without modification or remap
• Washable, reusable, intended to last the life of the motorcycle
• Two years of warranty are counted from the date of purchase

Insurance on a component that is getting scarcer

Coarser filtration is not dangerous; it is a shift in the odds. A wider aperture passes particles that a finer one would hold, and mineral dust that reaches a cylinder wall does its work slowly, over tens of thousands of kilometres. Racing lives with those odds because a race engine is not expected to accumulate that mileage. A discontinued road bike, kept and ridden for another decade, is the exact opposite case — it will accumulate exactly that mileage, on an engine that gets harder to rebuild every year the model is out of production.

When it is still the right call

There is a version of this bike for which the F1-85 is entirely correct: a Thruxton R that has become a track machine, run on an hours-based schedule with the top end inspected accordingly. Race preparation makes the trade work, because the wear that a coarse medium permits is caught before it compounds. For a road-registered Thruxton R the standard P08 is the medium to order, and on dusty or unsealed roads the P14 at 14 µm and 1,800 l/m²/sec goes further in the protective direction. A finer weave retains more and flows less; neither end of that line is better than the other.

Care and cleaning

Direction matters more than force: compressed air enters the PM217S F1-85 on the clean side and leaves outwards, taking the load out the way it came in. The rest is water with a mild detergent, rinsed until the water runs clear, then a full dry in open air. Heat and flame are never used, and the element is refitted dry — at no stage of its life is it oiled. The maintenance sheet waits in the Downloads tab.

Fitment & Compatibility

Made for the Triumph Thruxton 1200 R, 2016–2020. 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.