For the Sumter AMA National Enduro in South Carolina, the Southwick II is the recommended tire. The Southwick II with it tall aggressive knobs and open tread design, will get great traction in the sand. The alternate tire would be the Millville II, with its directional tread. The Millville II installed in the aggressive direction gets traction in conditions like sand and loam. The Kenda rider support boxes will be available, they will be at the first and second gas truck. If you get a flat during the race, the boxes contain Kenda Tuff-Tubes, bike stand, tools, tire spoons and air compressor. The tubes are on the honor system, just stop by after the race and pay for them. The support boxes are for all the riders regardless of tire brand you run. Trackside Support LLC the trackside vendor for Kenda tires will have a selection of Kenda tires and tubes. They also has bib mousses, if you prefer to not run tubes. You can reserve your tires at email@example.com or call Tim at (248) 431-7506 before 10 PM EST. Mounting is available on Saturday, we specialize in bibs and can handle most inserts. Kenda youth tires and Tuff-Tubes will also be available. Stop by the big Kenda arch and say hello. We also stock wear parts, plugs, sprockets, chain, brakes, bearings, filters, levers, etc, in case you forgot something.