I think tubes are a bad idea. I would bet my tires have a average of 10 plugs in each. I have slime in mine and my tires do go down if my bike is sitting, but if i use it everyday they stayed aired up. With a tube everytime I put a mesquite thorn thru a tire it would be flat and have to be broken down to fix. If I have a flat I just put a plug in it and go on. I carry a plug kit and a can of fix a flat with me all the time.
drscott