The club has two large rivals: Górnik Konin and Ostrovia Ostrów Wielkopolski. Both rivals sympathise with regional powerhouse Lech Poznań, KKS being one of the very few lower league teams in Greater Poland not to do so. Fans frequently shout "Autonomia Kaliska!" ("Kaliszan Autonomy!"), referring for autonomy from the Greater Poland region. In turn, their rivals respond with "Wielkopolska bez Kalisza!" ("Greater Poland without Kalisz!"). As a result of this KKS have rivalries with many other teams in the region who also sympathise with Lech, such as Kania Gostyń, Astra Krotoszyn, Jarota Jarocin, Pogoń Nowe Skalmierzyce, Polonia Kępno and Victoria Września. With regards to Lech itself, due to large discrepancy in divisions it has extended to only the reserve team and an off-field rivalry with the local Lech fan-club. They also have a strong rivalry with the other Poznań club Warta Poznań.