From the sixth to the thirteenth year of life Grahammer played in the Augsburg district club SpVgg Bärenkeller before he moved to the youth department of FC Augsburg and from there - outgrown the age of 19 the young age - to the professionals in the 2nd Bundesliga. On August 14, 1982 ( 2nd Round ) - with the Substitutes in the 76th minute for Jürgen Haller - he was in a 1-0 away win against MSV Duisburg his debut as a professional. His first goal was on 11 December 1982 ( 19th Round ) of the 1:2 goal back at 1:3 for SpVgg Fürth. At the 1st FC Nuremberg, to which he was changed in 1983 in the Bundesliga, he remained for five years (one year - in the second season - in the 2nd Bundesliga). For the " Club", he played for the first time on August 13, 1983 ( Matchday 1 ), which lost at home against Bayer Uerdingen with 2:4; his first goal he achieved on August 23, 1983 ( 3rd Round ) in the 2-0 home win against Arminia Bielefeld.
In 1988, he ( with Stefan Reuter ) - like so many Nuremberg regular in the 1980s - to Bayern Munich. For Bayern he made his debut on 23 July 1988 ( Matchday 1 ) in the 3-0 home win against Eintracht Frankfurt. The only two goals for Bayern reach him against Borussia Dortmund: On May 12, 1990 ( 34th Round ) ( Round 30 ) in a 3-0 home and on 17 May 1991 in a 3-2 away win. International club level he played 18 times, the first time on September 7, 1988 in a 3-1 home win against Legia Warsaw in the UEFA Cup. Although he belonged to the squad to the 1993/94 season, he played on 22 August 1992 ( 1-0 home win against 1 FC Kaiserslautern), as a serious breach led to the premature end of career.
On December 2, 1980 Grahammer came to his first international match, when he with the U-18 national team lost 0-1 in Horovice against Czechoslovakia. 1984 Grahammer was appointed twice in the U-21 National Team: On February 28, 1-0 against Belgium ( Koblenz ) and on 27 March, in a 1-1 draw against the Soviet Union ( in Osnabrück).
For the Olympic selection Grahammer played for the first time on 25 March 1987 in a 2-1 victory over the Israeli B- team ( in Tel Aviv). In 1988 he was part of the German squad at the Olympics in Seoul, finishing at the end of the football tournament in third place after defeating Italy 3-0; it is the only victory of a German men national team in a tournament against an Italian team. On 19 September 1988 in a 4-1 victory over Tunisia ( Olympic group play in Pusan ) brought him his only hit for this team.
Grahammer is active as a player consultant. He was responsible for overseeing other former national player Carsten Jancker, which is no longer active now.
- Olympic bronze medal in 1988
- German champions in 1989, 1990, 1994
- DFB - Supercup winner 1990
- Second in the Junior B Championship 1979