Accossato rear brake pads AGPP39ST, sintered (st) compound, for Yamaha R1
02 · Data & docs

The facts.

Technical data
Part numberAGPP39ST
CompoundSintered (ST)
Dimensions77.5 × 42.1 × 9 mm
MaterialSintered copper friction material with abrasives and carbon
Friction coefficient0.46 average, 0.52 maximum (dyno test to JASO standard)
Density4.50 g/cm³ at 20 °C (+0.10 / −0.05)
Hardness90 HRR (± 10 HRR, Rockwell HRR scale)
Temperature resistance450 °C working, 600 °C maximum peak
Minimum shear strength30 kg/cm²
Contents2 brake pads, one set for one caliper
DescriptionThe whole story▼

The rear brake of a Yamaha R1 does less work than the front, but it still matters: for settling the chassis in a slow corner, trimming speed mid-bend and holding the bike on a steep hill start. Accossato lists rear pad AGPP39 for the R1 from 2015 to 2024, and offers it only in the Sintered (ST) compound. That makes the choice simple, and the ST mix suits a rear brake that often sits cold for long stretches.

Key Features

  • Rear pad AGPP39 in Accossato's Sintered (ST) compound
  • For the Yamaha R1 2015-2024
  • Accossato: high, constant grip hot or cold, good wet grip
  • Predictable feel for light, precise rear braking
  • Suits a rear brake that often works cold
  • Two pads for the single rear caliper
  • ST is the only compound listed for AGPP39

Construction and Material Quality

Accossato says the Sintered compound keeps a high, constant level of grip at high and low temperatures and grips well in the wet. On the rear of a superbike, where the brake may be touched only occasionally and is often cold when you need it, a compound that does not depend on heat is useful. Accossato's general claims of long life, less fade and strong stopping apply as the maker's statements.

Using the Rear Brake on an R1

Experienced riders use the rear brake of an R1 gently: a touch to steady the bike before tipping in, a little drag in slow hairpins, or holding it on a gradient. Those inputs need a brake that responds the same way every time, without a sudden grab. The ST compound's steady behaviour hot or cold helps here. It also copes with wet roads, where a smooth rear input is especially valuable.

Changing the Rear Pads

Clean the caliper before removing the old pads, press the piston back carefully, fit the new pair and pump the pedal until it is firm.

Fitment and Compatibility

Accossato lists AGPP39 for the YZF 1000 R1 from 2015 to 2024. Earlier R1 generations are not included in this listing. The rear has one caliper, so one box is a complete set. For the front, Accossato lists AGPA97 for the R1 from 1998 to 2003, for the 2006 SP and from 2015 to 2024. Check the rear disc for wear and the fluid level at the same time.

Road Approval

AGPP39ST comes without an ABE; no test documents are available to us, so it is offered for track and competition use.

Scope of Delivery

Two Sintered (ST) rear pads, AGPP39, a full set for the R1's single rear caliper.

Specifications

  • Part number: AGPP39ST
  • Compound: Sintered (ST)
  • Dimensions: 77.5 × 42.1 × 9 mm
  • Material: Sintered copper friction material with abrasives and carbon
  • Friction coefficient: 0.46 average, 0.52 maximum (dyno test to JASO standard)
  • Density: 4.50 g/cm³ at 20 °C (+0.10 / −0.05)
  • Hardness: 90 HRR (± 10 HRR, Rockwell HRR scale)
  • Temperature resistance: 450 °C working, 600 °C maximum peak
  • Minimum shear strength: 30 kg/cm²
  • 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 R1 (2015–2024)
  • Honda CBR 1000 RR (2006–2019)
  • Honda CBR 600 RR (2007–2026)
  • Kawasaki ZX-10 R (2011–2026)
  • Kawasaki ZX-10 RR (2017–2024)
  • Kawasaki ZX-6R (2013–2025)
  • Suzuki GSX-R 1000 (2009–2026)
  • Suzuki GSX-R 600 (2011–2025)
  • Suzuki GSX-R 750 (2011–2025)
  • Suzuki GSX-R1000R (2017–2026)
  • Yamaha R1M (2015–2025)
  • Yamaha R6 (2017–2026)
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08 · Paddock

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