The Ohlins BM643 STX 46 Street rear shock is built for BMW R nineT Scrambler and R nineT Urban G/S riders chasing more controlled suspension behaviour on the road. It uses a gas-pressurised, oil/gas separated design to help maintain damping consistency as conditions change. The result is clearer chassis feedback and improved stability through everyday riding and spirited pace.

Ohlins | Made to race, perfected to ride

Ohlins street shocks draw on the same damping principles used in competition products, adapted for real-world road use. The focus is predictable control, traction, and confidence rather than harshness.

Shock design & features

This unit is an STX 46 Street shock with a monotube architecture and a pressurised reservoir arrangement that separates oil and gas. That separation helps reduce aeration in the oil and supports consistent damping performance.

Tuning controls

The BM643 includes external rebound damping adjustment, allowing you to tailor how quickly the shock returns after compression. Spring preload adjustment is also provided to help set ride height and sag for your load and riding conditions.

Who this shock is for

Suited to riders who want a more composed rear end over mixed road surfaces and better stability when pushing on. It’s also a practical choice if you regularly change load (solo vs luggage) and want adjustability to match.

Before you install

Confirm the application for your exact model and year before fitting. After installation, set preload to suit your typical load, then use the rebound adjuster to balance comfort and control once sag is in the right range.

Serviceability/lifecycle

Like any performance shock, regular servicing helps maintain damping quality over time. Inspect for leaks and worn mounts during routine maintenance and plan periodic servicing to keep the unit performing as intended.

SKU BM643
Model # S46DR1L
Brand Ohlins
Shipping Weight 5.0000kg
Shipping Size 0.300 x 0.300 x 0.500m
Type Units
See our Shipping Information See our Frequently Asked Questions
Position (Front or Rear) Rear Mono
Shock Length Eye to Eye (mm) 374.0 +12/-0
Spring Rate Standard 140.0 N/mm
Type Code S46DR1L
Stroke Metal to Metal (mm) 52.0
Product Family STX 46 Street
Fitted Spring: 21102-54
Spring Colour Yellow
Rec. Ohlins Oil 01309-

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