Wilbers Fork Spring - Zero friction - Progressive
Wilbers progressive fork springs
friction" Friction reduction through fine grinding, resulting in »ZERO friction«.
In vibratory finishing, the components to be machined, e.g. components, e.g. our fork springs, together with a specially together with a grinding wheel specially adapted for this in a vibrating container, the so-called trough vibrator.
The vibrations of the container generate a relative movement between the workpiece and the grinding wheel and, due to the constant rubbing against each other, lead to a smoothing of the component surface.
At the end of the processing there is a fine, shiny surface. Particularly with our fork springs, this reduction of the surface roughness means a minimization friction = ZERO friction.
Important is the combination with our specially developed Wilbers fork oil and the observance of the correct air chamber for the corresponding vehicle.
Product may differ from the picture.
Recommended viscosity and air chamber:
Fork Oil SAE 20 (1 L) | Air Chamber: 140mm
Additional Notes:
Compatible vehicles:
- 1979 Suzuki GS 750 /D /E | GS750 /D /E
Pickup available at EPM Performance Imports
Usually ready for pickup or shipment in 2-3 weeks.
Wilbers Fork Spring - Zero friction - Progressive
-
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
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
