If you were to log in, you'd be able to get more information on your fellow community member.
One thing concerning tires: I bought Swedish Crescent ATB in late eighties (All Terrain Bike - I suppose nowadays they are called hybrid bikes). If you know what a Volvo is, then Crescent is the bike equivalent. Anyhow, it came with special tires. In the middle of the tyre, there is a about 1 cm thick "slick" region, that raises above the knuckled part of the tyre. It is a great invention, on a smooth surface, like asphalt, the tyre rides on this easy-rolling part (I can tell it not only by feeling it, but also by driving through a pool of water and watching the marks the tires leave). When the terrain is softer, the knuckled part kicks in. Unfortunately these babies are getting harder to find, but they really work.
Maybe this format works better...