Kinetic and polymer analytical results obtained with the systems Me(2)Si(lnd)(2)ZrMe(2)/[B(C6F4Si(i-Pr)(3))(4)](-) [(C6H5)(3)C](+) (2) and Me(2)Si(Ind)(2)ZrMe(2)/[B(C6F5)(4)](-) [(C6H5)(3)C](+) (3) in olefin polymerizations are compared (Me: methyl; Ind: indenyl). Both systems show that the polymerization rate increases with increasing metallocene concentration in a surplus due to the formation of binuclear species. The expected influence of increasing cation-anion distance on the stereo-errors of the poly(propylene)s when changing from system 3 into system 2 could not be detected.