⟲ 360° — drag meThe facts.
| Brand | STM |
|---|---|
| Part Number | FBM-S020 |
| Type | Slipper clutch (anti-hopping clutch) |
| Fitment | BMW M1000RR K66 (2023-2026) |
| Anti-hopping mechanism | Patented ball-ramp system |
| Spring type | Diaphragm spring |
| Weight saving | Approximately 0.7–0.8 kg (reduction in rotating mass) |
DescriptionThe whole story▼
If you want more confidence on every ride — whether commuting hard through corners or pushing lap times on track — the STM slipper clutch for the BMW M1000RR K66 (2023-2026) delivers exactly that. By eliminating the engine-braking instability that causes rear-wheel hop and highsider risk under hard downshifts, this is one of the most practical and rewarding upgrades you can make to the M1000RR.
Key Features
- Prevents engine over-run on downshifts, keeping rear-wheel traction consistent and drive stable across everyday and spirited riding conditions
- Reduces rear-wheel chatter and hop for noticeably better traction, particularly when trail-braking into corners at speed
- Minimises the trigger impulse of a highsider, raising the safety margin significantly on both road and track
- Allows controlled rear-wheel slides, giving the rider the ability to fine-tune cornering balance rather than fighting the bike
- Improves clutch closure feel in bends, preventing unwanted front-end dip caused by abrupt re-engagement
- Diaphragm spring smooths lever release feel and eliminates pressure-plate flutter for a cleaner, more progressive action
- Weight saving of approximately 0.7–0.8 kg by reducing rotating mass, directly improving chassis responsiveness and agility
- Patented ball-ramp mechanism governs the anti-hopping function with precision, maintaining reliable performance at high engine speeds
Everyday Usability and Long-Term Value
The STM FBM-S020 is not a race-only component hidden behind complex setup procedures. Fitted in place of the OEM clutch, it works transparently every time you close the throttle and downshift — on a Sunday morning blast just as much as a track day. The weight reduction from lowering rotating mass is felt immediately as lighter, more responsive steering and quicker direction changes, benefits that are just as apparent filtering through traffic as they are at circuit speeds.
The diaphragm spring design reduces lever effort, which translates to less fatigue on longer rides. STM's patented ball-ramp geometry is engineered to self-adjust the anti-hopping force relative to engine speed, so the clutch behaves predictably across the full rev range without requiring track-side tuning between sessions.
Engineering and Build Quality
STM has been manufacturing slipper clutches for MotoGP-derived machinery for decades, and the FBM-S020 reflects that pedigree. The ball-ramp anti-hopping mechanism is a patented STM design that controls slip force with exceptional accuracy, preventing both premature slip under light deceleration and excessive lockup under heavy braking. Every component is manufactured to exacting tolerances so that fitment to the M1000RR K66 is direct and precise, requiring no modification to the surrounding drivetrain.
Fitment and Compatibility
This clutch is a direct fitment for the following motorcycle:
- BMW M1000RR – chassis code K66 – model years 2023, 2024, 2025, 2026
Specifications
- Brand: STM
- Part number: FBM-S020
- Type: Slipper clutch (anti-hopping clutch)
- Fitment: BMW M1000RR K66 (2023-2026)
- Anti-hopping mechanism: Patented ball-ramp system
- Spring type: Diaphragm spring
- Weight saving: approximately 0.7–0.8 kg (reduction in rotating mass)
FitmentWhich bikes this fits▼
- BMW M1000RR K66 (2023–2026)
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.