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Is there a easy way to scale this "truck" based on the size of the wheeles (just for illustration purposes?

Let's just say I know that the size of the front wheele should be exactly 30cm in diameter.
Now I would like to select the whole group, then select the key element I know the size to be, and then enter the size somewhere, and have the whole design resized.

Or do I have to create an object with the size I need, and the scale it until it seems to fit right?
Or is there a more accurate way of doing this?

enter image description here

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  • If you figure out the percent change of a circle to the target end state you could group all of the elements and scale it by that amount.
    – Zach Saucier
    Mar 10, 2021 at 13:30
  • Select wheel, scale it then repeat the transform for all but wheel?
    – joojaa
    Mar 10, 2021 at 14:45
  • Or draw a line thats 15 cm out form wheel and use the scale tool to place pivot at center of wheen and drag to line
    – joojaa
    Mar 10, 2021 at 14:58
  • Does this answer your question? Illustrator: How to scale precisely to a specific (off-screen) reference point?
    – Wolff
    Mar 10, 2021 at 15:46
  • I've chosen to vote to close your question as a duplicate. At first glance the question might not look similar, but check out my answer. You can use that method.
    – Wolff
    Mar 10, 2021 at 15:46

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In the example below, I have a wheel that has an original size of 45.508 units. The target size is 30 units. A simple calculation, the target size divided by the original size *100, gives you the percentage for scaling (see screenshot below).

In Illustrator select and group all the objects, and do Transform > Scale, then set the scale percentage to the one you just calculated.

enter image description here

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  • 2
    Protip: You can write the calculation into the dialog box just as long as you write one calculation at a time. So no need to leave illustrator.
    – joojaa
    Mar 10, 2021 at 16:47

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