Cholet (4-1) are the only side to have clinched a spot in the Quarter-Finals from the pool.
EiffelTowers rolled to a 20-point triumph in the first meeting with Bonn back on February 3 but the game in Germany was a different story.
Late in the second quarter, the contest was knotted at 31-31 but Bonn then got a three-point scoring explosion from Winsome Frazier and finished the half with a 15-8 run.
Frazier hit four three-balls in the last three minutes of the half as Bonn opened up a 46-39 lead.
They stayed in front for the rest of the game.
Not surprisingly, Frazier led all scorers at half-time with 19 points.
EiffelTowers, thanks largely to the offensive threat of Kees Akerboom, stayed within striking distance in the third quarter.
He would end up leading the Dutch team with 24 points but EiffelTowers didn't do enough to overcome Bonn, who went in front by 18 in the fourth quarter before settling for a seven-point triumph.
Frazier's 27 led all scorers with Johannes Strasser the only other Bonn player to hit double digits with 10.
Anthony Richardson had 19 points for the visitors.