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is there any way to lock only the main triangle, while change any other parameters on the frame?
The lock frame feature described at: bikecad.ca/lock_frame will lock both the front and rear triangle. Within that tool, there are also options to address whether or not the handlebar and saddle angles should change. I assume this is what you are looking for. If you wanted to lock only the front triangle and not the chain stays and seat stays, then I don't think there is any reason you need to lock the front triangle at all. If the lock frame icon is turned off, there is nothing you can do to the chain stays and seat stays that will have any impact on the geometry of the front triangle. The main purpose of the lock frame tool is to lock the shape of the frame when a different fork length is applied or if the size of either the front or rear wheel is changed without changing the size of the other wheel.
My reason is, I want to reuse an old frame I built formerly. But only the main triangle with new stays, wheels, and new, longer fork, so this is why I need to lock the front triangle. My purpose I want to know the BB height after these change, but I want a specific head angel too, so kind a rotatitng the frame around front wheel axle. Meanwhile I found out, that I can lock the whole frame , change the fork and after change only the rear wheel size, thus I can see BB height and HA. Later I will find the stays position. Thanks
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