Shock Absorber Type 644 WESA Dynamic Feedback Rear
The BMW F 750 / 850 GS and F 900 R / XR models can now also be equipped by BMW with the semi-active chassis "Dynamic ESA". Although the very sensitively responding and finely adjustable chassis from ZF hardly leaves anything to be desired, we are adding a shovel to the mix with our WESA dynamic Feedback chassis:
With this suspension optimisation it is possible to lower your bike by up to 60 mm - while retaining the adjustment possibilities via the ESA switch on the handlebars. Furthermore, the chassis is equipped with a special feedback adjustment, with which you can manually adjust the feedback and thus the ride comfort of the shock absorber step by step. Last but not least, our individual adjustment based on rider data ensures optimum handling for every rider weight and every load condition.
The electronic components of the series-produced shock absorber are completely reused. Therefore we need your original chassis to carry out the conversion. You can also have the conversion done by one of our trained dealers.
You also do not need to worry about the manufacturer's warranty of your serial shock absorber: We give you a 5 year warranty on our WESA dynamic feedback suspension. Furthermore our ABE makes an entry in the vehicle documents unnecessary.*
*If the suspension is lowered, a modification acceptance must be carried out at a TÜV station due to the shortening of the side stand.
When converting from ESA to WESA, the functionality of the ESA control unit remains completely intact. Dynamic ESA running gear.
For the coupling with the WESA system, it is necessary to send in your original ESA shock absorber. The coupling costs are 149,- EUR per shock absorber.
Additional Notes:
Compatible vehicles:
- 2020 - 2024 BMW F 900 XR | 4R90
Pickup available at EPM Performance Imports
Usually ready for pickup or shipment in 3-4 weeks.
Shock Absorber Type 644 WESA Dynamic Feedback Rear
Edition: Blackline | 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
