VAST is a new Patent Pending suspension system for mountain bikes (including E-bikes).
VAST builds on the best of the current systems while providing an improvement to the system's performance in the portion of travel from the fully extended position to the sag point. This is the portion of travel used when you sit on the bike, and what happens in this part of the travel is critical to bike performance when pedaling over bumps.
VAST Provides Sag Centered Dynamics via Variable Anti Squat Technology (VAST) as follows:
The VAST system is always harnessing pedaling forces to assist the suspension system to return to the sag point. (Traditionally other systems provide maximum anti squat when the suspension is fully extended and anti squat is not required at all.)
VAST provides reduced anti squat (below 100%) when the suspension is extended above the sag point:
The benefits of these outcomes are explained here.
VAST provides tuned higher anti squat (e.g. around 100% or slightly above) when the system is around and compressed past the sag point for efficient pedaling and a firm feel under hard pedaling (without locking up the system).
It provides low anti-squat towards full compression (to minimize pedal kick back via chain lengthening).
Test Proven Performance Benefits
You can tell when riding the VAST bike that it is better. But that feeling is backed up hard test data. Go here to see the results.
VAST Provides other Key Features also:
Great options for shock leverage ratio, with options to suit both air and coil shocks.
Effective anti rise performance to ensure brake jacking is managed.
Contact us or check out the More Info tab here for further explanation.
Vast was originally conceived around a simple concept. Reduce the anti squat above the sag point to focus the system dynamics towards the sag point. In its original form, this outcome was achieved via a new linkage layout that provided a wheel path roughly representing an "S" shape. However, following further analysis, development and testing, this original concept has been developed much further. Significant reductions in anti-squat above the sag point below 0% are not really needed. A more refined approach is to provide an anti squat curve that is more consistent and changes less rapidly.
This is now provided by the second generation of VAST designs. Refer below for a comparison of Gen I and Gen II anti squat configurations.