Contact Gear Toolbox

Questions, corrections and ideas are all welcome. If a result looks wrong to you, tell us which calculator, the numbers you entered and what you expected: every report is checked against the formulas and their sources.

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Other ways to get in touch

You can also write to info@geartoolbox.com. Gear Toolbox is run by one person, so a reply can take a few days.

The calculators give estimates to plan a build with. They cannot tell whether a part will fit or work on a particular car: for that, talk to your shop or the parts manufacturer.

My Garage

Build Sheet

Paper size