d Sept. 4 to take effect Jan. 1 include a sometimes puzzling mix of complete bans on urethanes, allowing urethanes made at 78D or higher, and no changes — depending on the competition, as I detailed in this story. For USBC college bowling, there will be no changes for the college regular season and sectionals but then a ban for the Intercollegiate Championships. It was never... subscribe to read more. USBC’s new rules for urethane (aka slow oil-absorbing high-performance) bowling balls announced Sept. 4 to take effect Jan. 1 include a sometimes puzzling mix of complete bans on urethanes, allowing urethanes made at 78D or higher, and no changes — depending on the competition, as I detailed in this story. For USBC college bowling, there will be no changes for the college regular season and sectionals but then a ban for the Intercollegiate Championships. It was never... Social Media: