The objective of this study is to address the replacement of up to 30 parts of EPDM with SBR to reduce the cost of finished products and to improve selected blend properties using more efficient cure systems. Effects of sulfur, peroxide, and coagent curing systems on blend properties were studied. It was found that the addition of a small amounts of sulfur as a coagent to the peroxide cure system in EPDM/SBR compounds remarkably improved mechanical properties of the blends, Important compound properties including: mechanical properties, compression set, heat aging, and ozone resistance of the EPDM/SBR blends are also compared with those of EPDM compounds.