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.

Öhlins Motorcycle Suspension Warranty

New Öhlins motorcycle shock absorbers, front forks and cartridge kits supplied by Teknik Motorsport are covered by the applicable Öhlins manufacturer’s warranty against defects in materials and workmanship.

Teknik Motorsport is an authorised Öhlins Service Centre and administers warranty claims in accordance with the Öhlins warranty conditions. The service intervals below form part of the maintenance requirements for Öhlins products supplied and supported by Teknik Motorsport.

This warranty is in addition to the consumer guarantees that apply under the Australian Consumer Law.

  • Registered motorcycles — non-competition road use Five years, subject to correct application, installation, setup and servicing every: 20,000 km or two years, whichever occurs first.
  • Registered motorcycles — adventure and light off-road use Five years, subject to correct application, spring rate, setup and servicing every: 10,000 km or annually, whichever occurs first.
  • Unregistered or competition motorcycles Two years for eligible Öhlins MX and Enduro products, subject to inspection every ten hours and servicing every: 30 operating hours or annually, whichever occurs first.

Compliance with the applicable service interval is a condition of the Öhlins manufacturer’s warranty. Evidence of servicing may be required when a warranty claim is assessed.

A seal leak, loss of damping performance or internal wear arising after the prescribed service interval has been exceeded will be treated as a service or maintenance issue rather than a manufacturing defect.

Warranty repairs

Öhlins suspension products are designed to be serviced and repaired. Where a warranty claim is approved, the normal remedy is repair of the customer’s original suspension unit using genuine Öhlins replacement parts.

Replacement of a complete shock absorber, fork or cartridge kit is not automatic and would normally occur only where the product has suffered a manufacturing failure that cannot reasonably be repaired. This is at Ohlins discretion. 

Öhlins spare parts and service kits

Öhlins spare parts, seals, bushes, service kits, springs, fluids and individual components are covered only against defects present when supplied.

No fixed age-based warranty applies to wear items, service parts or consumable components. Wear, deterioration, contamination, incorrect installation and damage caused by another component are not manufacturing defects.

Öhlins gives the customer a meaningful five-year warranty on products (Units), provided the suspension is maintained as suspension should be maintained. Teknik supports that warranty locally, can inspect the product properly, and can repair it with genuine parts rather than discarding it.

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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