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The Wilbers solution upgrades these to progressive fork springs
BMW F-Series one-sided cartridge kit
We also fine‑tune chassis geometry by increasing negative travel slightly while maintaining seat height for a neutral
The stock rear shock absorber uses a progressive spring with a very poor block value
causing the fork to react abruptly
Wilbers Fork Spring - Zero friction - Progressive Cartridges The Wilbers solution upgrades theseWilbers progressive fork springs ZERO Friction finishing Our vibratory finishing process (trough vibrator with tailored media) micro polishes the spring surface. The resulting fine, shiny finish reduces surface roughness and friction hence ZERO Friction. Pair with our specially formulated Wilbers fork oil and the specified air chamber for your vehicle to maximize performance. Product may differ from the picture. Recommended viscosity and air chamber:
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US$ 143.95
US$ 124.95
US$ 199.95
