Shock Absorber Type 540 Road
The Kawasaki ZX-6R (ZX636G) comes standard with linear fork springs. The Wilbers conversion also uses linear fork springs, which are a little harder. In addition, the Wilbers Zero Friction fork oil with an adapted air chamber is used.
This optimises the damping, the negative spring travel as well as the response behaviour.
Due to the specific race track design of the Kawasaki ZX-6R, we offer fork springs in different spring rates. If you have any questions about which spring rate is ideal for you, please contact our support team.
The Kawasaki ZX-6R is delivered from the factory with slightly too high negative spring travel. Due to the minimally shorter Wilbers strut, the seat height remains the same as on the standard suspension.
In the standard version the shock absorber has clearly too much rebound damping. The Wilbers shock absorber optimises both rebound and compression damping.
This results in the additional advantage of a larger adjustment range compared to the standard suspension. This results in a better ride and better handling, which also contributes to a safer ride.
Ecoline 540 Mono Road Ø 46 mm
The well priced alternative.
Stepless adjustable spring preload by using the included spanner tool.
With the radial-piston and the progressive shim-package you’ll always get the optimal damping.
High-quality, maintenance-free spherical plain bearings bearings promise long and healthy life.
5 years warranty with ABE.
Product may vary from picture.
Download available ABE
Additional Notes:
Compatible vehicles:
- 2019 - 2025 Kawasaki ZX-6R Ninja | ZX636G
Pickup available at EPM Performance Imports
Usually ready for pickup or shipment in 3-4 weeks.
Shock Absorber Type 540 Road
Lift/Lowering: Std
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EPM Performance Imports
Pickup available, Usually ready for pickup or shipment in 3-4 weeks.
3 Fedornak Freeway
Unit 1
Whiting NJ 08759
United States+17327869777
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Let customers speak for us
Excellent service, quick turnaround, HAPPY customer!
Great product great communication fast delivery!!!
5 star
Everything I wanted and never knew I needed. Spec’d perfect. Didn’t even have to adjust sag.
100 times better than stock, wife on back says nothing compared to ouch or ugh when we hit a bump
I have spinal stenosis, this was exactly what I was looking for.
huge improvement !
replaced the ktm garbage, which had completely failed and was bouncing and bouncing and bouncing
Excellent service throughout. Thank you!
Fits perfectly
Very high quality
If you have a 40–50 lb rider on a Husqvarna EE 5 (or KTM SX-E 5 / TC 50), swapping out the factory shock spring for this 25 N/mm spring is hands-down the single best suspension upgrade you can make.
The stock rear spring is notoriously oversprung for young kids. Before installing this, our rider was getting bucked over braking bumps, the rear end skittered out in flat turns, and it was physically impossible to dial in correct rider sag—even backed all the way out on the preload collar.
Swapping to the 25 N spring completely transformed the bike's balance:
True Sag Numbers: Finally allowed us to set proper race sag (targeting ~60–65 mm) while still maintaining healthy static free sag.
Chassis Balance: Balances out the front WP air fork so the bike stays level and planted instead of riding stinkbug into turns.
Instant Confidence: The rear wheel actually tracks through acceleration chop and ruts now rather than deflecting. Our rider felt the difference on lap one—much less fatigue and far more control over rough, choppy sections.
Fit and finish (47x130) are spot-on, drop-in replacement with the stock WP shock collars, and the coating holds up to roost and power washing. Don’t waste time fighting the stock spring if your kid is under 55 lbs—this 25 N spring fixes the rear end completely. Highly recommend!
Awesome addition to the 390. The spring had made 2 up riding much more comfortable.
Sterrring damper is amazing! Got rid of all the head shake at high speeds. I only have it 5 clicks in and it's working as it should. The guys at EPM are great. Thanks!
Got shipped out right away
Easy to install
