The Physics of Interference: Understanding Pedal Kickback
Chainstay growth results from rear suspension kinematics. As the rear axle moves through its travel, the distance between the bottom bracket and the hub often increases. This extension forces the chain to bridge a widening gap, creating a mechanical tug-of-war between your cassette and your cranks.
When the freehub is engaged, this tension pulls the crank arms backward against your weight. This is pedal kickback. Because your body is a literal weight on the pedals, you inadvertently resist the suspension’s movement. This interference forces the shock to work against your mass, choking its ability to track the terrain with precision.
The Impact on the Trail
In high-frequency chatter and technical descents, micro-spikes in chain tension create an unpredictable platform. The consequences are measurable:
- Reduced Sensitivity: The suspension feels harsh because it is fighting drivetrain tension rather than absorbing the trail.
- Erratic Traction: When the suspension is restricted by kickback, the rear tire cannot maintain a consistent contact patch.
- Compromised Setup: Tuning a shock becomes a moving target when mechanical interference is constantly altering the effective spring rate and damping feel.
The Sidekick Solution
The Sidekick Hub eliminates this conflict. It introduces precision-engineered, adjustable deadband. This allows for a specific degree of free movement before the drivetrain engages. As a result, the suspension decouples from the cranks.
By isolating these systems, we ensure chainstay growth does not cause chain tension. The chassis stays poised. The suspension can breathe, delivering the silence and composure needed for demanding lines.