The Tractive X-TREME Fork Cartridge Kit for the BMW F 850 GS replaces the standard fork internals with closed, pressurised cartridge units for more consistent damping control. This architecture helps reduce cavitation under demanding use and maintains predictable feel across changing conditions. This kit is intended to reduce ride height, helping riders who want easier ground reach without sacrificing suspension quality.

Design & features

This kit is built around sealed cartridge construction with controlled oil flow through an internal piston and shim stack. The closed, pressurised design supports stable damping behaviour over long rides and varied terrain, while keeping the fork action composed when loads and surfaces change.

Tuning Controls

Rebound damping adjustment is provided to tailor the fork’s return speed to rider preference, load, and conditions. Spring preload adjustment is also included to set sag and front-end ride height feel appropriately for solo riding, luggage, or different riding styles.

Who is this for?

  • BMW F 850 GS riders seeking a lower stance for improved confidence at stops and low speed.
  • Adventure-touring riders who want more controlled, consistent fork behaviour for mixed-surface use.
  • Riders who prefer a serviceable cartridge solution for long-term ownership.

Before You Install

  • Plan your setup around rider weight and typical load so preload can be set to achieve appropriate sag and balance.
  • After installation, verify chassis attitude and steering feel with the lowered front ride height.
  • Use small rebound changes and test on familiar roads to confirm stability and comfort.

Serviceability/Lifecycle

The cartridge kit is designed to be serviceable so damping performance can be maintained over time. Routine servicing and rebuilds help keep internal wear controlled and preserve consistent fork behaviour through the product’s lifecycle.

Teknik Motorsport Pty Ltd Warranty terms for TracTive products.

This TracTive product has been assembled with the utmost care and tested according to ISO9001:2015 Quality system. In the unlikely event that the product does not fulfill your expectations because of faulty materials or manufacturing errors, please contact us through your dealer.

Teknik Motorsport Pty Ltd warrants that if, within 24 months of the date of sale the product is found to be defective as a result of manufacturing errors or faulty components, the product will be repaired free of charge by us, or by a TracTive approved repairer at our discretion.

Warranty covers the direct service material cost, service labour cost ($80/hr AUD) and shipping costs of the service partner. Other costs will be regarded on a case by case basis by Teknik Motorsport and TracTive.

 When a claim is made under the warranty, the following conditions have to be met:

  • You must have read the instructions carefully before mounting the product in the vehicle or adjusting the product.
  • The product has to be installed and adjusted as described in the instructions
  • The product must have been maintained and serviced in accordance with the recommendations in the manual. If not described in the manual, the recommended service intervals for regular street use: every 30.000 km or max 2 years, whichever is earlier.
  • Warranty shall apply only when TracTive original parts, procedures and tools have been used to service and/or repair, and if service and repair is performed by designated TracTive partners.
  • The product may not have been neglected, improperly used, altered or subjected to excessive loads. Excluded from warranty are normal wear, damage and rust.
  • A sales receipt or other proof of purchase originally eminating from Teknik Motorsport Pty Ltd. No warranty will be given on TracTive or Touratech products not purchased from or through Teknik Motorsport pty ltd.
  • Excluded from warranty are in particular products which are used in vehicles that are intended or suitable for taking part in sporting events, or have actually been used this way.
  • Recommended service interval for Motorsport applications: every season, or every 50 hours, every 10.000km or after any perceived loss in performance.
SKU 35BM18-R5397-TR
Model # 35BM18-R5397-TR
Barcode # 35BM18R5397TR
Brand TracTive Suspension
Shipping Weight 5.0000kg
Shipping Size 0.200 x 0.200 x 0.900m
Unit Of Measure Set
Type X-TREME
Format Front
See our Shipping Information See our Frequently Asked Questions
Position (Front or Rear) Front
Damping Adjustment Type Rebound
Seat Height Change (mm) Lowered -25
Spring Rate Standard 6.0 N/mm
Manufacturer Note 2 Side and/or center stand might be too long
Spring Option -2 5.2-390
Spring Option +1 6.4-390
Spring Option -1 5.6-390
Air Chamber - Street 65
Cartridge Length (mm) 850.0
Spring Option +2 6.8-390
Manufacturer Note 1 Fork oil included
Damping Feature Hydraulic end-stop
Damping System Separated oil/gas
Rebound Adjuster Position 10
Spring Preload Setting 19 +12/-0
Preload Adjustment Mechanical
Spring Type Linear, included
Piston Diameter (mm) 35
Suspension Unit Type Cartridge kit
Fitted Spring 6.0-390
Notes Hydraulic end-stop
Stroke Metal to Metal (mm) 200.0
Type Code X-TREME

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