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I just bought a new pair of slicks, M&H 8.0/27-15 (actually 9 inches of treadwidth). I was told that if I run tubes I need ones with screw in valve stems to pass tech. I was also told I could try them tubeless, but it was suggested that I use bolt in valve stems. I tried them and they interfere with the step in the rim and won't sit flush. Does anyone know if the rules require bolt in stems for tubeless running or if I can use stock rubber stems? Do you recommend tubes or tubeless? -o