Re: tire tread??
Yes the small wheel cuts the bike speed dramatically. but it will climb like a mountain goat. I found out something yesterday. I was climbing a steep hill with the bike and the motor started to race. Instead of trying to push to keep the speed up as I usually do, I just reduced the throttle to where it stopped racing and the bike just kept on climbing at the same rate but didn't seem to be in any strain at all. I would have thought that reducing the throttle would cause the bike to falter but it didn't not at all.
I expect the drop in speed is due to the wheel being newer or maybe just a little tighter. I'm not going to back off on the tension just let it wear in.
My posts have entertainment value only. A bike ain't yours till it has your blood on it. Then it owns you.