safe
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It also takes longer to lean from one direction to another. (seems odd since the center of mass should be similar to old position, maybe even more centralized)
It is harder to park at racks, since it is topheavy.
With the reduced front weight it wheelies a bit too easy now.
If you go back to Endless Sphere I had posted a lot on a very involved thread about how center of mass effects handling. The mistake most people make is thinking that the axis of rotation is a constant at all speeds, but in fact the axis angle changes. The faster you go the more rotation occurs along the horizontal axis, while the slower you go the rotation occurs on an axis that goes from about the top of the front wheel (typically) to the contact patch of the rear wheel.
Anyway... we all kind of know intuitively that rear rack mounted battery ebikes are going to handle badly... but just how badly it really is can come as a shock. (no doubt)
You probably remember it:
http://endless-sphere.com/forums/viewtopic.php?f=3&t=5891&start=465&hilit=center+of+mass
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