14+ FZ-09/FJ-09/XSR900 GP Suspension 25 mm Cartridge Kit

(4 customer reviews)



Here it is:  the most properly sorted, fully adjustable fork cartridge kit for the FZ-09, the FJ-09, and the XSR900.  The factory-issue forks are adjustable for rebound only, and in stock form, provide very little damping.  GP Suspension‘s 25 mm cartridge kit delivers race proven technology to riders both on the street and the track and provides compression damping adjustment.

  • Full replacement cartridge kit – replaces internals of both forks (including fork caps).
  • 25 mm compression valve w/ custom shim stack.
  • 25 mm rebound piston w/ custom shim stack.
  • 8 degree needles provide laminar flow characteristics through the piston bleeds and increased adjustability.
  • Springs sized for the rider’s weight and riding style.
  • 5 wt. Silkolene fork oil.
  • (Optional) SKF ‘Green’ Fork Seals – reduced stiction w/ increased service life

We’ve spent hours honing the final configuration of this kit and firmly believe you won’t find a more comprehensively tuned cartridge kit on the market.  As always, please contact us for spring rate recommendations.  Please note that these kits are custom built at the time of order.  Please allow up to 3 weeks to fill.

If you plan to do the installation yourself, please have the factory service manual handy.  You will also need an Ohlins-style fork cap spanner in order to install the fork caps without damage and an 8-pin Ohlins cartridge holding tool to torque the cartridge; these toosl can be added to your order or sourced elsewhere.  If you’re not keen on purchasing the tools, but would like to do the installation yourself, we also offer tool rental here:  GP Suspension 25 mm Cartridge Kit Tool Rental

Additional information

Weight 5 lbs
Dimensions 30 × 6 × 4 in
Fork Spring Rate

0.70 kg/mm, 0.75 kg/mm, 0.80 kg/mm, 0.825 kg/mm, 0.85 kg/mm, 0.875 kg/mm, 0.90 kg/mm, 0.925 kg/mm, 0.95 kg/mm, 0.975 kg/mm, 1.0 kg/mm, 1.05 kg/mm, 1.1 kg/mm

Fork Cap Adjuster Color

Black, Blue, Red

Track Riding

Track Riding: Novice, Intermediate, Advanced, Expert

Fork Tools

No, Fork Cap Spanner, Cartridge Holding Tool, Both

Shirt Size

Medium, Large, X-Large

4 reviews for 14+ FZ-09/FJ-09/XSR900 GP Suspension 25 mm Cartridge Kit

  1. Will Longworth (verified owner)

    The pogo problem is truly in hand. The bike is a totally different animal. I love it. brake dive is minimized, the bumps of the road (or track) are soaked up and forgotten.
    Full adjustability and excellent customer service. Can’t go wrong.

  2. Tim

    I had this kit installed last year and having ridden the hell out of it all I have to say is “Hot damn!”. This kit absolutely transformed the front end, the feel is finally there, the confidence and planted feel is unlike anything else. Spend the dough and you won’t be disappointed one single bit. Thanks again Nick!

    • Nick Stolten

      Man, that’s great to hear! Thanks for taking the time to share your experiences…love getting positive feedback like this!

  3. Tom Ward (verified owner)

    Just installed my GP cartridges on my 2016 FZ-09 (to go with the Stoltec Penske double clicker I already have installed) and these make a HUGE difference in how the bike handles! It’s like a scalpel instead of a butter knife now! Ride is firm but compliant…you have to take the time to dial the forks and shock in and the reward is a bike that handles and rides vastly better than the stock set up. Also, Nick’s customer service is outstanding as I had many questions before AND after the installation. He always took the time to answer my questions or just give me solid advice on set up. 5 stars all the way!

  4. Jason Blankenship (verified owner)

    This is the good stuff! Very happy I went with Stoltec. Once the particulars were agreed upon I received my kit quickly. Install was fun and the performance is amazing. Nick knows his way around the FZ 09 having both the seat time on the bike and the bench time working these kits. You wont find that elsewhere. This is in my opinion simply the only choice for those seeking the very best. Customer support is second to none.

    • Nick Stolten

      We’re glad you’re pleased with the new forks, Jason. As you say, these are the ‘good stuff’ and we’re glad they impressed you!


Add a review

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.