From 1992 to 2003, Bölts took part in 12 consecutive Tours de France, arriving in Paris on every occasion, both of which feats are German records.

In 1996 and 1997, he was an important helper of teammates and eventual winners of the Tour, Bjarne Riis and Jan Ullrich.

[citation needed] Some of his victories include three German road national titles (1990, 1995 and 1999),[1] the Clásica de San Sebastián in 1996 or a stage win at the 1992 Giro d'Italia.

He also is the only German rider to have won the Dauphiné Libéré, which he did in 1997, a year in which he was also fourth in the World Cycling Championships.

In the wake of the 2007 Team T-Mobile scandal Bölts confessed publicly on 23 May, having used EPO and growth hormones in preparation for the Tour the France 1996, continuing with the practise in 1997.