Hello everyone! I am a motor-bicycling virgin so my question may seem ridiculous. but here goes: I was injured while overseas and both kneecaps got dislocated. I love my bike, and now it is also part of my PT. Because of my friggin' knees, riding isn't quite as joyous as it used to be. So I was thinking of getting a motor for my bike but couldn't decide between gas and electric and then I thought why not both? Has anyone tried this? Physically, they both would fit, but I don't know about the rest, i.e, gearing, etc. Can anyone please point me in a useful direction? Thanks so much in advance for your help!