The tire that came with my kit was off balance and was making my ride very unstable. I took off the tire and inner tube (which has a weird inflation point). I put the tire that was already on my bike onto the hub motor and my problem was solved. I noticed a little vibration when I first started using my kit, but it got progressively worse. The tire that comes with the kit does not seem to be of good quality (at least the one I received). One part of the tire was off by about a half inch. Imagine speeding that half inch up to 20mph and the front tire becomes very wobbly.
If you have a bad tire, don't sweat it, just put your original on it and you should be fine.
