The facts.
| Brand | Öhlins |
|---|---|
| Part Number | 00580-21 |
| Spring Rate | 75 N/mm |
| Free Length | 250 mm |
| Inner Diameter | 57 mm |
| Stroke | 118 mm |
| Construction | Straight |
| Finish | Powder-coated yellow |
| Country of Origin | Sweden |
DescriptionThe whole story▼
Öhlins part number 00580-21 is a shock absorber spring rated at 75 N/mm, 250 mm long with a 57 mm inner diameter. Rear spring rate sets ride height, static sag and how much of the damper's stroke is actually usable.
Key Features
- Powder-coated yellow
- Inner diameter 57 mm
- Measured spring rate 75 N/mm
- Free length 250 mm
- 118 mm of usable stroke
- Straight-wound, constant rate
- Öhlins part number 00580-21
Manufacture and Tolerance
Materials read unremarkably on paper — aluminium, steel, nitrogen — and the difference lies in how precisely they are made. Production has stayed in Sweden since the company was founded in 1976. Service parts stay available for years after a part number leaves the current price list.
Size and Rate
Dimensionally this is a 57 mm × 250 mm spring; within that envelope Öhlins offers a range of rates, and this one is 75 N/mm.
Where This Rate Belongs
A firm rate keeps the fork high in its stroke under braking, which preserves the geometry when the front is loaded hard. Heavier riders, two-up use and track days all push the choice towards this end. Support under braking improves; small-bump comfort gives a little back. Ride quality on the road is decided by rate first and damping second.
How a Rear Spring Works
Adding a pillion or luggage changes the rear load enough that the standard rate stops working properly. Preload adjusts sag within a rate; it does not change the rate, and no amount of it will rescue a spring that is wrong. Static sag at the rear sets the whole chassis attitude — get it wrong and the front geometry goes with it.
Applications
A workshop will pick this spring from its dimensions and the rider's weight, not from a fitment table. Any workshop with the fork or shock in front of it can answer whether this spring fits — the three figures above are all it needs. Nothing about the installation changes across a rate range: the mounting, the length and the bore stay the same.
Installation
Set static sag after fitting; the rate is only right if the sag figure lands where Öhlins specifies. Rate and preload are separate adjustments: get the rate right first, then set sag with preload. Fork oil should be replaced at the same time — it is already out of the leg.
Road Approval
Road approval: a spring is a like-for-like replacement of a wear part and carries no separate type approval. Where Öhlins states an approval for a particular motorcycle, it is named under Applications.
Fitting and Setup Service
Fitting matters as much as the part. We are an authorised Öhlins service centre and carry out installation, servicing and setup ourselves — get in touch and we will arrange it alongside your order.
Specifications
- Brand: Öhlins
- Part Number: 00580-21
- Spring Rate: 75 N/mm
- Free Length: 250 mm
- Inner Diameter: 57 mm
- Stroke: 118 mm
- Construction: Straight
- Finish: Powder-coated yellow
- Country of Origin: Sweden
FitmentWhich bikes this fits▼
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