Mounted these up on Stans Grail wheels. Tight fit..rode them a couple training rides without any sealant at 25 PSI...no leakage. Loaded them with Orange Seal and raced them this past weekend on a wet, grassy, loose and sandy course with everything except deep mud. Normally would have rode a PDX. Never felt loose on the steep down hills or off camber turns. The side knobs are the high point along with the Maxxis grippy rubber compound. A good clincher to have at the ready.