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MotoSPEC supports all the common rear suspension configurations, and a lot of less common ones also. Many of the suspension configurations can also be specified with eccentric rear axles. FRAME-MOUNTED ROCKER Below is the Frame-Mounted Rocker that is found on 2005 and later Yamaha R6, and 2009 and later Yamaha R1. 
Ride Height Gauges are used as a reference for measuring the vertical position of the rear wheel relative to the frame.
A Ride Height Gauge is a better reference for vertical rear wheel position than a point on the seat cowl or rear subframe, which can be damaged or bent in a crash. The MotoSPEC Ride Height Gauge function represents the physical gauge in the chassis program, calculating the gauge measurement as setup changes are investigated. 
Ducati ride height gauge on Kyle Wyman's Ducati V4 R
Additions to the MotoSPEC library of chassis files in 2021 include the Ducati Panigale V2, BMW M1000RR and Yamaha R7.
Updates made to MotoSPEC during 2021 include force-based Dynamic Presets, improved Fork specifications, and Multi-Rate rear springs.
With British Superbike kicking off this weekend, FS-3 Kawasaki crew chief Ian Prestwood shows how he uses MotoSPEC to simulate and evaluate the effect of setup changes at Oulton Park.
Recent modifications to MotoSPEC include a revised but familiar interface, improved component specifications and custom colors.
There are two types of chassis files used with MotoSPEC, indicated by their extension: MS1 and MS3.
The two types of chassis files allow MotoSPEC to be configured in multiple ways, providing flexibility to accommodate different usage scenarios.
There are four options for specifying fork position in MotoSPEC, to accommodate every method in use.
Right-clicking in one of the MotoSPEC columns will display a context menu that allows settings to be copied from another column.
PRO licenses can copy the entire chassis specification and settings from another column, and also clear all chassis specifications and settings from the column.
Dunlop has provided the inflated profiles for their flat-track tires - the new tubeless DT4's and also the pre-2020 tubed DT3's.
For PRO licenses, the tire specifications now include radial stiffness.
Using the profile and radial stiffness, MotoSPEC v5.7 can calculate the 'loaded radius' of the tire with lean angle, improving the accuracy of the geometry calculations.
MotoSPEC can map a Ride Height Gauge into the chassis specifications.
MotoSPEC will then calculate and display the ride height measurement corresponding to the chassis settings. This allows rear ride height to be accurately maintained or modified while exploring setup options, and the shock length or ride height adjustment can be specified when generating build sheets for mechanics. 
The MotoSPEC GEARING TABLE will calculate the swingarm length and final ratio, as determined by the countershaft location and swingarm geometry.
The user can specify the swingarm length and sprocket ranges, and only gearing options within those ranges will be presented in the GEARING TABLE. The GEARING TABLE can be sorted to present the gearing options for the most efficient decision making.
The SETUP SHEET function can be used to write out chassis setting or geometry values directly from MotoSPEC into an Excel spreadsheet.
This eliminates the duplicate entry of values in MotoSPEC and the user's Excel setup sheet, saving time copying these values for record-keeping or when creating build sheets for mechanics. The cell address for each value is specified once, and then all the desired values can be written out with just a couple of mouse clicks. The file, column and row specifications are retained after MotoSPEC is closed, so that they are available the next time that the SETUP SHEET is used. 
The PageUp and PageDown keys can be used to increment the value of each setting in the three columns.
The 'Import HED file' function will fill the settings in one or all MotoSPEC columns from a 2D HED file.
This reduces the duplication of entering setup information in both 2D and MotoSPEC. This feature can be found under 'DATA AQ'>'Import HED file'. 
Inserts in the steering head or headstock of the frame can be used to adjust the rake and the weight distribution of the motorcycle.
MotoSPEC can specify these inserts in several ways, to accommodate all the different methods in use. 
MotoSPEC PRO licenses can specify tire profiles in order to consider the effects of lean angle on the geometry of the motorcycle.
An explanation of the effects of lean angle and tire profiles can be found in the post 'EFFECTS OF TIRE PROFILE WITH LEAN ANGLE'.
MotoSPEC v5.5 introduced analysis of lean angle and tire profiles in the PRO version of MotoSPEC.
Please see the post 'SPECIFYING TIRE PROFILES' for an explanation of tire profiles.
MotoSPEC v5.6.1 added a setting that will indicate the forward reference for the swingarm length.
Swingarm length is typically measured from the swingarm pivot axis to the rear axle. On most motorcycles, the swingarm pivot is visible and accessible. For Ducati Panigale V2 and V4 models with adjustable swingarm pivots, the eccentric adjustment occurs inboard of the swingarm bracket - so the swingarm pivot axis is not directly accessible for measurement. The calculations for swingarm and chassis geometry now consider the offset between the frame center and the actual swingarm pivot. |
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