A more gentle approach would involve soaking some paper towels in acetone, wrap them around the tube, get your trusty duct tape and wrap it. Let it set for an hour and the decals ought to start to fester and puss, just like that future trail rash battle scar on your forearm that you'll get from riding your fine new steed.
Wipe it with the towel. Rinse. Repeat.
Maybe the towel wrap needs to stay on overnight.
dunno, maybe try a 50 percent solution of acetone with water for the first try, just to be really gentle.
The decals are under a clear coat, I assume a clear powder coat. The only safe way to take them off is to slowly sand off the clear coat over the decals, and then remove them once the clear is gone. But then you would need to re-clear those sections if you want the paint to look okay. You could try the acetone method, but I don't know if acetone can remove a powder coat clear. You could also try some diluted paint stripper and try to only strip off the clear without damaging the color coat.
None of the methods are paticualrly easy, so unless you are dead set on not having decals, its probably better to just leave them.
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