Bought mine from Roger Krause Racing.
1) No tubes needed with ally wheels. If you are running older mag wheels a tube would help daily upkeep as older mag does allow air to pass however slowly.
2) They do throw rocks, fine for the purist however if you are a fanatic about paint you may want to rethink options.
3) If you are a purist RKR now offers the old Dunlop tires. (My preference
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RKR was a pleasure to deal with.