Karting Trummer began his
motorsport career in
karting back in 2003, finishing second in the Swiss Junior Championship. He also finished 21st in the
Andrea Margutti Trophy ICA Junior class.
Formula Lista Junior Trummer moved up to
single-seaters in 2006, competing in
Formula Lista Junior. He finished eighteenth overall in the championship with ten points.
Formula Renault Trummer joined the BMS Böhlen Motorsport team in 2007, to compete in the
Formule Renault 2.0 Suisse championship. He wasn't so successful in this series, winding up seventh in the championship. Trummer switched teams, joining
Jenzer Motorsport for 2008 and finished the season as runner-up.
International Formula Master After two races at the end of the
2008 season, Trummer moved up to the
International Formula Master series for the
2009 season, with
Iris Project. He finished in eleventh place in the standings.
GP3 Series Trummer stepped up to the new
GP3 Series with
Jenzer Motorsport in
2010. He finished the season in 25th place with four points, despite missing the round in Hungary due to driving into the rear of another car in Hockenheim. During 2010 in GP3 with Jenzer Motorsport, he was always outperformed by fellow Swiss driver
Nico Müller which lead Simon to seak another team for 2011. He moved to
MW Arden for the
2011 campaign. Trummer had three point-scoring finishes in final races, improving to 18th position with nine points.
GP2 Series round of the
2014 GP2 Series. After competing in the
non-championship season finale at
Yas Marina in 2011, Trummer continued his collaboration with Arden International into
2012 by switching to the
GP2 Series full-time. He joined series veteran
Luiz Razia in the team, and finished 23rd in the final standings. He then went to
Rapax in the
2013 GP2 Series season, and is confirmed with
Rapax for the 2014 season. ==Racing record==