The Ohlins BM420 STX 46 Adventure rear shock is built to improve control and comfort on BMW K 1100 LT, K 1100 RS, and K 1100 SE models. It is designed for consistent damping over long-distance use, including touring loads and rougher road surfaces. This unit is supplied as a rear mono shock to suit the original mounting position.

Ohlins | Made to race, perfected to ride

Ohlins suspension is developed with a focus on damping consistency, predictable feel and long-term serviceability. The STX adventure-oriented architecture is aimed at riders who want a more controlled chassis without compromising day-to-day usability.

Who this shock is for

  • Riders using their K 1100 for touring and day-to-day road riding who want improved composure and comfort
  • Owners carrying luggage or a pillion who need better support and stability
  • Anyone looking for a quality replacement rear shock with external adjustments for setup refinement

Shock design & features

This is an oil/gas separated monotube design rather than an emulsion shock, helping maintain damping stability as conditions change. The construction is intended for repeatable performance and straightforward servicing over the life of the unit.

Tuning controls

The BM420 provides external rebound damping adjustment and compression damping adjustment, along with spring preload adjustment. These controls let you tailor the shock to rider weight, luggage and typical road conditions.

Before you install

  • Confirm fitment for BMW K 1100 LT, K 1100 RS and K 1100 SE and check overall condition of linkages and mounting hardware
  • Set sag and preload for your typical load before fine-tuning damping
  • If you are changing riding load often (solo vs luggage/pillion), note your preferred settings so you can return to them easily

Serviceability / lifecycle

Like other Ohlins units, this shock is designed to be serviced. Periodic servicing helps keep damping consistent and protects internal components, particularly on bikes used regularly for longer-distance riding.

SKU BM420
Model # S46PR1C1S
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) 382.0
Spring Rate Standard 50.0 N/mm
Type Code S46PR1C1S
Stroke Metal to Metal (mm) 93.0
Product Family STX 46 Adventure
Fitted Spring: 01099-09

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