Wheel Diameter

Use the spinner to select your wheel diameter (in inches)
 
 
 
 
 

Tyre Width

Use the spinner to select your tyre width (in mm)
 
 
 
 
 

Tyre Profile/Radius

Select whether your tyre is graded by profile or radius using the option buttons (road tyres are graded by profile).

Use the spinner to select the profile or radius
 
 
 
 
 

Rev Limit

Use the spinner to select your chosen rev limit
 
 
 
 
 

Diff Ratio

Select your diff ratio from the drop down menu. If your ratio is not listed then select 'other' and insert the ratio in the box below.
 
 
 
 
 

Gearbox

Select your gearbox from drop down menu. If your gearbox is not listed then select 'other' enter your ratios in the box below.
 
 
 
 
 

Input box

This is only for use if your diff ratio or gearbox are not listed in the drop down menu. If you have a six speed gearbox then you can afford to pay for someone to write a new sheet!
 
 
 
 
 

Speed

Use the spinner to select a speed. The box below will then display the revs required to atain this speed in each of the gears.
 
 
 
 
 

Max Speed

This box displays the maximum speeds atainable in each gear based on the rev limit entered.
 
 
 
 
 

Print Sheet

This prints the sheet (obvious really!)
 
 
 
 
 

Restore Defaults

This will return all the spinner options back to their default values.
 
 
 
 
 

Revs

Use the spinner to select a rev level. The box below will then display the speed this relates to in each gear.
 
 
 
 
 

Data Box

This box contains the data required to calculate all the variables. It is worth checking that the gear ratios displayed agree with those of your gearbox.