The facts.
| Part number | AGPP106STMX |
|---|---|
| Compound | Off-road sintered (STMX) |
| Dimensions | 66.9 × 36 × 9.3 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 |
DescriptionThe whole story▼
Rally-style riding puts the rear brake under a load that no road bike would recognise. A Beta RR 390 4T covering long stages of sand and broken stone uses the pedal continuously to steady the back end, and by the end of a stage the caliper holds as much of the course as the air filter does. Accossato's Off-road sintered (STMX) material exists for that kind of day, and it fills the AGPP106 shape listed for the rear wheel of the RR 390 from 2015 to 2019.
Key Features
- Rear pads for the Beta RR 390 4T, model years 2015 to 2019
- Article number AGPP106STMX: the AGPP106 shape in Accossato's STMX material
- Accossato's compound for riders whose ground is sand, dust and soil
- For long off-road stages, events and days in the dirt
- Two pads to a box, the set the rear caliper takes
- The same shape is also available in the OR and ST materials
- Front of this Beta: AGPA51, listed for 2015 to 2021, plus the DK017 brake disc
- No German ABE on file; sold for competition and off-road riding
Construction and Material Quality
Rather than describing a recipe, Accossato identifies an audience for the STMX material: the rider who is off the tarmac. That is the honest way to put it, because what defines the application is contamination rather than temperature. Sand gets into the caliper and stays there, working against the friction face on every rotation of the wheel, and the pad has to carry on doing its job regardless. The AGPP106 outline is the same one used for the road materials, so it fits the rear caliper of the RR 390 4T without any change of routine.
Sand, Stones and Long Stages
Sand asks for the rear brake in a way that firm ground never does. The bike wallows, the front wheel wanders, and the rider holds the machine straight on the throttle and the pedal together, trimming the speed rather than stopping. Hours of that leave the material worn in an unfamiliar pattern, and a stony section afterwards finishes the job, because the grit thrown up by the rear wheel goes straight into the gap between pad and disc. Long stages are simply more of the same.
Servicing between stages is worth doing properly. Get the worst of the sand out of the caliper before any water goes near it, then rinse from a distance and let it drain. Check both pads, look for an unevenly worn pair as a sign that a piston is sticking, and clean each piston before pressing it back. After fitting new pads, press the pedal until it comes up firm, then bring the bike gently up to speed on the first easy section so the material settles against the disc before it is needed.
Fitment and Compatibility
Accossato covers the rear of the Beta RR 390 from 2015 to 2019 with this pad, while the front listing for the AGPA51 continues to 2021. Owners of a machine from the last two seasons of that run should therefore order the two ends separately rather than assuming one entry covers both. A caliper takes two pads, the box holds two, and they are replaced together. The DK017 disc is listed for the model for anyone renewing the pairing completely.
Road Approval
There is no German ABE for the AGPP106STMX and no test paperwork to accompany it. Its place is at events and on closed ground rather than on the road.
Scope of Delivery
Two AGPP106 pads in the Off-road sintered (STMX) material, packed as one caliper's set.
Specifications
- Part number: AGPP106STMX
- Compound: Off-road sintered (STMX)
- Dimensions: 66.9 × 36 × 9.3 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▼
- Beta RR 390 4T (2015–2019)
- Beta RR 125 2T (2018–2019)
- Beta RR 300 2T (2013–2019)
- Beta RR 430 4T (2015–2019)
- Beta RR 480 4T (2015–2019)
- GasGas EC 200 (2017)
- GasGas EC 250 (2012–2020)
- GasGas EC 300 (2012–2020)
- Kawasaki KLX 450R (2007–2024)
- Kawasaki KX250F (2004–2018, 2020)
- Kawasaki KX450 (2019–2026)
- Kawasaki KX450F (2006–2018)
- Kawasaki KX450X (2021–2024)
- Suzuki RM-Z 250 (2004–2026)
- Suzuki RM-Z 450 (2005–2020)
- Suzuki RMX450Z (2010–2018)
- TM Racing MX 125 2T (2005–2025)
- TM Racing MX 250 2T (2005–2025)
- TM Racing MX 250 4T (2005–2025)
- TM Racing MX 300 2T (2005–2025)
- TM Racing MX 450 4T (2005–2019)
- Yamaha WR 250 X (2008–2016)
- Yamaha WR250F (2003–2013, 2015–2024)
- Yamaha WR250R (2008–2020)
- Yamaha WR450F (2003–2022)
- Yamaha YZ125 (2003–2026)
- Yamaha YZ250 (2003–2026)
- Yamaha YZ250F (2003–2026)
- Yamaha YZ250FX (2015–2021)
- Yamaha YZ450F (2003–2022)
Questions, one topic at a time.
Get the real shipping cost for this item to your address — the same rates as checkout.
Choose a destination and hit Estimate — we fetch the live rates for this item.
We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.
Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.
Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.
Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.
As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.
On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.
You have the right to cancel within 14 days of receiving your order. Register your return by email first; once it’s approved you have a further 14 days to send the goods back. Items should be unused and in their original packaging.
Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
Refunds go back to your original payment method, usually within 3–5 working days of your return reaching our warehouse.
PayPal, all major credit and debit cards (Visa, Mastercard, American Express), Klarna (pay later and instalments), Apple Pay, Google Pay and more — all processed securely via PayPal and Mollie.
Yes. Choose Klarna at checkout to split your purchase into flexible monthly installments.
Your payment is taken when you place your order. If you choose Klarna, you pay later according to Klarna’s terms.
Every payment runs over an SSL-encrypted connection through certified providers. We never see or store your full card details.
If your order hasn’t shipped yet, contact us as soon as possible and we’ll do our best to change or cancel it.
No — you can check out as a guest. An account simply lets you track orders and reorder faster.
For customers in the EU, prices are shown including your country’s local VAT. For customers outside the EU, prices are shown without VAT — instead, your country’s import taxes and duties may apply on delivery (see the customs question).
Yes. Your invoice is attached to your order confirmation email and is also available in your account.
Yes. We’re an authorised dealer, so every product is 100% original and comes with the full manufacturer warranty.
Yes. Everything we sell is genuine and comes with the manufacturer’s warranty, on top of your statutory rights. Keep your invoice as proof of purchase and contact us if you ever need to make a claim — we’ll help you through it.
Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.