⟲ 360° — drag meThe facts.
| Brand | Öhlins |
|---|---|
| Part Number | DMX 1305 |
| Fitment | Beta RR 4T 390 Racing (2020–2025) |
| Road Approval | Not documented by Öhlins |
| Length | 474 mm |
| Stroke | 131 mm |
| Recommended Öhlins Oil | 1304 |
| Product Line | TTX Flow DV |
| Type Code | T46PR1C2W |
| Country of Origin | Sweden |
DescriptionThe whole story▼
For the Beta RR 4T 390 Racing built 2020–2025, Öhlins specifies DMX 1305. The difference shows up in the second half of a fast road, when the standard unit has warmed through.
Key Features
- 131 mm of damper stroke
- Overall length 474 mm as specified by Öhlins for this model
- Bolts to the Beta RR 4T 390 Racing (2020–2025) using the standard mounting points
Materials and Manufacture
The unit is rebuildable: seals, shims and oil are catalogue items, not a reason to buy a new one. Öhlins machines its own critical components instead of buying them in, and the tolerances are where the money goes. Shafts are hardened and surface-treated so the seal has a consistent surface to run against.
Where This Sits in the Öhlins Line-up
Ride height and preload are set with the spring collar; the damper itself is length-fixed for the linkage it was designed around. Because both circuits stay under pressure, the damper does not cavitate when the wheel is unloaded over a jump and slammed back down on landing. A motocross track feeds the rear damper the same impact twenty times a lap; what matters is whether the twentieth feels like the first, and that is exactly what the pressurised circuits protect.
Fitted to the RR 4T 390 Racing
At 390 cc the RR 4T 390 Racing makes enough torque to load the rear hard on corner exit, and the damper has to keep the wheel in contact while that happens. This part number spans model years 2020 to 2025; earlier and later generations take different numbers. On a supersport machine, front-end feel under braking is what the rider trusts, and damping is what provides it.
How It Behaves on the Road
Öhlins quotes 131 mm of damper stroke for this fitment. Öhlins specifies 1304 for this application, and the damping curve assumes that oil. The 474 mm length is dictated by the RR 4T 390 Racing's own geometry. Öhlins publishes a baseline setting for each part number, which is the sensible starting point. The adjuster range is usable end to end rather than only around the middle.
Fitment and Compatibility
Part number DMX 1305 and the Beta RR 4T 390 Racing (2020–2025) belong together; other model years take other numbers. Because the settings are model-specific, fitting it to a related machine would mean running the wrong specification. Öhlins notes for this application: 06310- & 06451- spring series. Preload adjuster 15000-02 fits this shock. *Replaces DMX 0305*
Road Approval
Road approval: not documented by Öhlins for the Beta RR 4T 390 Racing. We do not state an approval we cannot evidence — please confirm the current status with us before ordering if you intend to use the motorcycle on public roads.
Fitting and Setup Service
We are an authorised Öhlins service centre, so the installation does not have to be your problem: we fit and set up Öhlins components in our own workshop. Ask us when you order and we will include the work.
Specifications
- Brand: Öhlins
- Part Number: DMX 1305
- Fitment: Beta RR 4T 390 Racing (2020–2025)
- Road Approval: Not documented by Öhlins
- Length: 474 mm
- Stroke: 131 mm
- Recommended Öhlins Oil: 1304
- Product Line: TTX Flow DV
- Type Code: T46PR1C2W
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
- Beta RR 4T 390 Racing (2020–2025)
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