Wilbers Powered by ZF Fork Type 46RR with Closed Cartridge
ACA = Air Chamber Adjuster The new 46RR ACA fork is a particularly interesting innovation in the Wilbers range. We install a closed cartridge, which can be adjusted on the left side in the rebound stage and on the right side in the compression stage in 10 clicks each. Of course, the spring preload can also be adjusted on both sides. Adapted wall thicknesses ensure optimum flex behaviour and an incomparable ride feel with high grip even when leaning. The special feature of the 46RR ACA is the unmissable cylinders on the axle mounts. Our patented system allows you to adjust the oil level from the outside by up to 10 mm in increments of 0.5 mm. The inconvenience of opening the fork to adjust the oil level is now a thing of the past.
Additional Notes:
Compatible vehicles:
- 2017 - 2020 BMW R nineT | 1N12
Pickup available at EPM Performance Imports
Usually ready for pickup or shipment in 2-3 weeks.
Wilbers Powered by ZF Fork Type 46RR with Closed Cartridge
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EPM Performance Imports
Pickup available, Usually ready for pickup or shipment in 2-3 weeks.
3 Fedornak Freeway
Unit 1
Whiting NJ 08759
United States+17327869777
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Let customers speak for us
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
Was experiencing crazy tank slappers on my mt09 I bought this to try it out,absolutely game changing I have not experienced any sort of wobble since!
arrived quickly and packaged perfectly. Thanks.
