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Tandem Straighten Top Tube

If I create a generic tandem design, the 'Straighten Top Tube' button is grayed out and not clickable. How do I get this button to work?

Straighten tandem top tube

That's another minor feature that is only available in BikeCAD Pro. You can still make the top tube straight from the head tube to the stoker's seat tube by manually adjusting the length of the captain's or stoker's seat tube or by setting the seat tube length option to (c-t) and playing with the extension of the seat tube above the top tube.

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