Wilbers Zero Friction Progressive Fork Springs G650X Challenge
Wilbers Zero Friction Progressive Fork Springs have several advantages over linear springs. A Progressive Rate Spring has the advantage of a rising rate resistance to compression. The benefit of this is that the spring can be soft enough at the start of the travel to offer a "plush" ride, yet be firm enough at the end of the travel to soak up the big bumps and reduce nose dive.
You will need two quarts of fork oil, 10 wt is recommended.
Although not required, SKF fork seals are highly recommended due to excessive stiction of stock fork seals.
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