Monkers has got the drop on tubs. One little thing I can add. To glue them on, put them on the wheel with no glue, or just the existing residue from the previous tub, then pump them up to about half pressure. Push about 20cm of tub up onto the raised rim edge, add the glue to that section of rim, drop the tub back into place, then do the same with the next 20cm section and so on all around the wheel. Pump up to full pressure. Turns a life-and-death struggle with the mastic monster into scientific sticking. Enjoy the rolling ride.