Frustrated because Spinlife sent the wrong tire size for a wheelchair when they had the correct model number. I took the tires for installation, which took some time to arrange, to be told that the tires were incorrect. However, I had them 2 days longer than the 30 day return time and Spinlife would not take them back. I also had bought 2 tubes, but neither lasted more than a few days because of a defect causing both to explode at about the same spot. Spinlife did not respond to this either. $50 wasted.