<Page> EXHIBIT 12.1 REXNORD CORPORATION COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (IN MILLIONS) <Table> <Caption> Six Months Ended Fiscal Year Ended March 31, September 30, ---------------------------------- -------------------- 2000 2001 2002 2001 2002 --------- --------- -------- ------- -------- Income (loss) before income taxes $ 92.1 $ 80.7 $ 1.1 ($ 18.6) $ 28.3 Fixed charges 39.2 39.3 26.1 17.2 11.0 --------- --------- -------- ------- -------- Earnings $ 131.3 $ 120.0 $ 27.2 ($ 1.4) $ 39.3 ========= ========= ======== ======= ======== Interest expense $ 37.5 $ 37.4 $ 24.0 $ 16.1 $ 9.9 Interest portion of rent expense(1) 1.7 1.9 2.1 1.1 1.1 --------- --------- -------- ------- -------- Fixed charges $ 39.2 $ 39.3 $ 26.1 $ 17.2 $ 11.0 ========= ========= ======== ======= ======== Ratio of earnings to fixed charges 3.35 3.05 1.04 N/A(2) 3.57 ========= ========= ======== ======= ======== </Table> (1) For purpose of calculating the ratio of earnings to fixed charges, fixed charges include net interest expense and the portion of rent expense estimated to represent interest expense. (2) Earnings were insufficient to cover fixed charges for the six months ended September 30, 2001 by $18.6 million.