*A "fudge factor" is applied by default to account for the slight non-roundness of tires in contact with the ground. You can disable this by de-selecting the "Use Fudge" check box.

Don't see your favorite car in the pre-defined list? Send me the data!

As much as I'd love to keep this calculator always up-to-date with new (and old) car information, I'm only one person and there are only 24 hours in the day.

If you don't find your favorite car in the pre-defined data list (or if you find an error!), send me the info and I'll make the update.

I need several pieces of information to add a car to the list:

• Car make/model, and specific years if appropriate
• Stock tire size
• Final drive ratio(s)
• Redline
• Gear ratios (up to ten)

Note: For cars with multiple final drive ratios, be sure to specify which gears use which ratio.

Send all of this data via email to sig-tool@c20d.us with the subject line "Speed in Gears data".

Thanks for your support!