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Modeling a Mountain Bike

Select the curves shown below, using Shift-LMB (left mouse button) to click for multiple selections.

Then go ‘Surface/Sweep 1 Rail’ in the Menu to see the options. Rhinoceros often selects what curve would be the rail / profile curve, which makes the modeling process very fast. Use the default settings.

Repeat this function with the curves shown in the 5 figures below:

1.

2.

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5.