The Ohlins BM181 STX 46 Blackline rear shock is built for BMW R18 and R18 Classic riders looking for more controlled suspension behaviour without changing the bike’s character. It combines Ohlins damping know-how with a Blackline finish suited to classic and custom builds. Adjustability is provided so you can tailor the feel to your load, pace, and road conditions.

Ohlins | Made to race, perfected to ride

Developed from Ohlins road-going suspension experience, this rear shock is intended to improve chassis control and consistency across varied conditions. The Blackline styling keeps the look in step with heritage and cruiser-focused motorcycles.

Shock design & features

This is a rear mono shock from the Ohlins STX 46 Blackline family. It uses an oil/gas separated design to help maintain damping stability during use.

Tuning controls

Adjustment is provided for rebound damping, compression damping, and spring preload. These controls let you balance comfort and support, manage ride behaviour with different loads, and refine stability over changing road surfaces.

Is it right for you?

Choose this shock if you want a rear suspension upgrade for an R18 or R18 Classic with practical on-bike tuning and a finish that suits vintage-inspired builds. It’s also relevant if you’re replacing an earlier Ohlins fitment, as this model replaces BM 180.

Before you install

  • Confirm fitment for your exact BMW R18 or R18 Classic variant before installation.
  • After fitting, set preload and damping to suit your typical riding load and check fastener torque to the motorcycle manufacturer’s requirements.
SKU BM181
Model # S46DR1S (B)
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) 390.5
Spring Rate Standard 95.0 N/mm
Type Code S46DR1S (B)
Stroke Metal to Metal (mm) 52.5
Product Family STX 46 Blackline
Notes Replaces BM 180
Fitted Spring: 21103-31

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