My friends Puch Maxi ran out of gas the other day and while pushing it I noticed that their is an insane amount of resistance when pushing or peddling the bike relative to my Puch. It legitimately takes effort to turn both the front and rear wheels by hand, whereas the with one flick, the front wheel on my Maxi will rotate freely for like a minute. I checked and it doesn't appear to be rubbing against the frame at all - would this be a wheel bearing issue? Could the wheel just be on too tight? We loosened the wheels yesterday and they moved much better, though still not as freely as mine, and the when we loosened enough to make a difference, there was sideways play on the wheel, so we had to tighten back up. I don't really know much about wheels but didn't see anything specific to this on the wiki - if anyone has experience with this it'd be greatly appreciated.