Accossato off-road sintered brake pads, front, AGPA288STMX for Yamaha WR450F (2020-2022) — placeholder, product photo coming soon
02 · Data & docs

The facts.

Technical data
Part numberAGPA288STMX
CompoundOff-road sintered (STMX)
Dimensions94 × 33.5 × 7.4 mm
MaterialSintered copper friction material with abrasives and carbon, for off-road use
Friction coefficient0.65 average (0.58 minimum, 0.72 maximum), JASO regulation
Density4.50 g/cm³ at 20 °C (+0.10 / −0.05)
Temperature resistance450 °C working, 600 °C maximum
Contents2 brake pads, one set for one caliper
DescriptionThe whole story▼

At an enduro event, a Yamaha WR450F is ridden flat out through timed special tests, then along muddy liaison stages, with little time to clean anything between them. For the WR450F from 2020 to 2022, Accossato lists its AGPA288 front pad, and this listing is the Off-road sintered (STMX) compound. It is intended for riders who compete or ride at race pace off-road and need a front pad designed for abrasive, wet and dirty conditions throughout a long day.

Key Features

  • AGPA288 front pad in STMX off-road compound
  • For the Yamaha WR450F, 2020 to 2022
  • Accossato's compound for off-road riders
  • Designed for special tests and liaison stages
  • Works in mud, grit and water
  • One box for the single front caliper
  • ST version also offered

Construction and Material Quality

Accossato calls STMX its compound for off-road riders and leaves it there. We do not add numbers. The purpose is clear enough: a pad made for dirt, water and grit, where a road compound would be out of its depth. The company's off-road credentials include an Enduro World Championship title in 1985.

Special Tests at Full Speed

In a special test, a 450 enduro reaches high speeds between tight turns, and the front brake has to shed that speed quickly on loose ground. STMX is designed to keep working as mud and grit coat the disc. The rider needs a lever that behaves the same in the last test of the day as it did in the first. Between tests, the liaison stages add water crossings and slippery climbs, with more dirt thrown at the brake.

Paddock Routine

At the end of the day, wash the caliper, check pad thickness and inspect the disc. On a two-day event, change pads overnight if they are getting thin. Fresh fluid before each event is worth it.

Fitment and Compatibility

The Accossato listing for AGPA288 covers the WR450F from 2020 to 2022. Our garage data runs to 2026, but the listing stops at 2022, so check your pads before ordering for a newer bike. Older WR450F front brakes from 2003 to 2015 take AGPA51. AGPP106 is the rear pad for 2003 to 2022. A single front caliper takes one box. Accossato also lists the DK111, DK168, DK268 and DK269 discs for this model.

Road Approval

There is no German ABE or test mark in our records. STMX is offered for off-road competition.

Scope of Delivery

One box with two AGPA288 STMX pads for the front caliper.

Specifications

  • Part number: AGPA288STMX
  • Compound: Off-road sintered (STMX)
  • Dimensions: 94 × 33.5 × 7.4 mm
  • Material: Sintered copper friction material with abrasives and carbon, for off-road use
  • Friction coefficient: 0.65 average (0.58 minimum, 0.72 maximum), JASO regulation
  • Density: 4.50 g/cm³ at 20 °C (+0.10 / −0.05)
  • Temperature resistance: 450 °C working, 600 °C maximum
  • Contents: 2 brake pads, one set for one caliper
What's includedEverything in the box▼
  • 1x Accossato brake pad set (2 pads)
DownloadsData sheet▼
FitmentWhich bikes this fits▼
  • Yamaha WR450F (2020–2022)
  • Yamaha WR250F (2022–2026)
  • Yamaha YZ125 (2021–2026)
  • Yamaha YZ125X (2022–2025)
  • Yamaha YZ250 (2021–2026)
  • Yamaha YZ250F (2020–2026)
  • Yamaha YZ250FX (2025)
  • Yamaha YZ250X (2024–2026)
  • Yamaha YZ450F (2020–2022)
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08 · Paddock

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