So I had to test the 31cc full suspension bike again. It had a thump in somewhere I ran it and it seemed to get worse so I ran some tests I should have run before. Tests for other things that narrowed down my search. Methodical me don't ya know.
The front tire was a 24" semi knobby. It had a heavy big tread pattern but shorter and closer together than a true knobby tire. I had run it for a couple of days and thought maybe it was the problem. So I pulled it and replaced it with a 26" smooth tire. I had always been curious as to what the difference would be.
I am pretty sure the bike climbs better with the smaller wheel it shouldn't but I think it does. The bike seems to run faster with the larger tire but again it should not. The bike does not seem to run any rougher or smoother with the different tire patterns. Given the simi knobby would wear longer, I am inclined to buy those from now on. They are also the cheap ones from bell at kmart.
Well it still thumped so I pulled the rear wheel. Low and behold it was way messed up in the axle parts. Just way too loose. Since I had a spare I didn't even try to fix it. It came from a junker and probably is just worn out. I might take a look if I ever need another one.
So I think the tire thing says go for the deep tread but not the knobby. Size does matter but not too much. I only noticed the lack of hill on the first one before I got up any speed. With a little speed to bleed off it worked just fine.
