User Manual

  Input file

    Shim Stack

    Valve Geom

    Aux Components

    Reservoir

    Response

 

  Outputs

    ReStackor

    Bump Velocity

    Response

 

Suspension Response Inputs

ReStackor suspension response calculations run on the "Response" tab of the mid-valve spreadsheets. Inputs describe the bikes mass, spring rate, link ratio and stroke depth. Inputs are described below. 

Response calculations use the shocks compression damping force given on the "Mid-Valve-Calc" tab of ReStackor mid-valve spreadsheets. Those outputs are generated by the mv_Analysis button run on the "Plots" tab of ReStackor spreadsheets. The shocks rebound damping force is computed on the MVr spreadsheet tab with outputs loaded onto the "mvr_ReStackor" output tab. 

ReStackor Suspension Response Inputs

Mass:

m.wheel [=] Wheel un-sprung weight. Includes wheel, tire, brake caliper, fork stanchion tubes and everything else bouncing up and down with the wheel

Chassis [=] Curb weight of bike including wheel weight, fuel and accessories

Weight split [=] Ratio of rear to front bike weight

Spring:

k.spring [=] Spring rate

preload [=] Preload on spring at full extension

Stroke:

Stroke [=] Suspension stroke type, one of {fork, shock, front, rear}

fork: Calculations assume front chassis weight is supported by two fork legs with equal damping and spring rate in each leg. For a single function fork (SFF) use the shock input below and reverse the front/rear weight spilt (1-Weight split).

shock: Calculations assume rear chassis weight is supported by the spring rate and damping of a single shock

front: Spec for car. Calculations assume front chassis weight is supported by two shocks, two spring and two wheels

rear: Spec for car. Calculations assume rear chassis weight is supported by two shocks, two springs and two wheels.

Travel:

Race sag [=] Normal suspension ride height. Typically 1/3 of suspension travel

Max Stroke [=] Stroke depth for calculations. Recommend bump rubber position as maximum stroke depth for suspension tuning

Wheel Position Data:

At least four wheel/shock position measurements are needed, maximum of 39. Adding more position measurements improves the fidelity of the suspension link ratio curve.

y.wheel [=] Wheel stroke distance measured from full extension

y.shock [=] Shock stroke depth measured from full extension

Suspension Response Calculations

To run suspension response calculations you must first determine the shocks compression and rebound damping force. The calculation process is shown below:

  • Calculate compression damping:

    • BVc tab: Fill in and run the shocks compression adjuster or base valve for fork calculations

    • MVc tab: Fill in and run the shocks mid-valve compression stack

    • Plots tab: Hit the "mv_Analysis" and "Load_Output" buttons to compute the combined compression damping force of the shocks base valve and mid valve. Outputs are loaded onto the "Mid_Valve_Calc" tab of the spreadsheet

  • Calculate rebound damping:

    • MVr tab: Fill in and run the shock rebound damping stack. Outputs are loaded onto the "mvr_ReStackor" output tab

  • Calculate suspension Response:

    • Response tab: Fill in the stroke data and hit the "Run"/"Load_Output" buttons. Multiple cases can be run and each cases uses the shocks damping force data loaded on the "Mid_Valve_Calc" and "mvr_ReStackor" tabs of the spreadsheet.