LuK Challenge Chrono was a road bicycle race held annually as a team time trial for pairs in Bühl, Germany. In 2005 and 2006, the race was organized as a 1.1 event on the UCI Europe Tour. After 2006, the sponsor, LuK, withdrew as part of Germany's general disengagement from cycling amidst a number of doping scandals, and the race did not take place again.
In the past, this race was also known as: