
The facts.
| Brand | Melotti Racing |
|---|---|
| Part | RBS Brake Hoses |
| Part number | RBS.YA.21720, RBS.YA.21721 |
| Master cylinder | OEM / Radial |
| Fitment | Yamaha YZF-R6 (2017-2021) |
| Road approval | None documented, track use only |
| Made in | Italy (Castello di Brianza) |
DescriptionThe whole story▼
Yamaha built the YZF-R6 in its current supersport form from 2017 to 2021, and plenty of those bikes now live out their working lives on a racetrack rather than a public road. Once a rider has fitted Melotti Racing's RBS brake system to a YZF-R6, the braided hose set is the part that eventually needs replacing, whether after a fall or simply because a line has reached the end of its service life. This listing covers that hose set on its own, built to match either the OEM or the radial front brake master cylinder originally specified for the YZF-R6's RBS installation.
Key Features
- Braided steel brake hoses with a PTFE inner liner, built for the Melotti Racing RBS system on the YZF-R6
- Supplied to match either the OEM or the radial front brake master cylinder, chosen when ordering
- Stainless steel fittings at both ends of each line
- Allowed in Stock-class racing, where the original hydraulic architecture has to stay in place
- Sold as a spare or replacement set, independent of the RBS brake block itself
- Fits the YZF-R6 built from 2017 to 2021
Construction and Material Quality
Melotti Racing builds the lines for its RBS system from braided steel over a PTFE inner liner, the construction it uses across its racing brake hoses, and finishes each line with stainless steel fittings rather than the plated brass common on stock equipment. For this bike the set is supplied to match whichever master cylinder the RBS block was ordered with, OEM or radial, so the fitting at the lever end lines up without an adapter. Stainless hardware shrugs off a season of trackday washdowns better than plated steel, and the braided outer sheath holds its shape under hydraulic pressure instead of ballooning the way an older rubber hose can.
Stock-Class Brake Upgrades
Stock-class and similar production-based categories generally require the hydraulic system to stay close to its original layout, which rules out swapping in a different master cylinder or caliper but still leaves room for upgraded lines. Because this hose set is built to the OEM or radial master cylinder pattern rather than to a Melotti-specific one, it fits that allowance: the brake feel changes because the braided line resists expansion under pressure, not because the fundamental architecture has been altered. Riders converting a road-going machine into a stock-class racer often start here before touching anything else at the front end.
Fitment and Compatibility
Melotti Racing lists this hose set specifically for the YZF-R6 built from 2017 to 2021, matched to its RBS brake system. Melotti's own note for this item is a single price-list line, so if you are unsure which master cylinder option your RBS block takes, OEM or radial, send us the part number from your current system before ordering and we will confirm the match ahead of checkout.
Road Approval
No type approval or test certificate is on file for this hose set, and Melotti Racing sells it for racetrack and closed-circuit use. Riding this bike fitted with it on public roads in Germany without separate registration is not permitted, and at organised events the promoter's own technical rules decide what is allowed.
Scope of Delivery
One braided-steel, PTFE-lined hose set for the Melotti Racing RBS system, built to the OEM or radial master cylinder as selected, with stainless fittings at each end.
Specifications
- Part: RBS Brake Hoses
- Part number: RBS.YA.21720, RBS.YA.21721
- Master cylinder: OEM / Radial
- Fitment: Yamaha YZF-R6 (2017-2021)
- Road approval: None documented, track use only
- Made in: Italy (Castello di Brianza)
FitmentWhich bikes this fits▼
- Yamaha YZF-R6 (2017–2021)
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