A new cultivar of shrub rose, `BAIcer`, characterized by its clusters of double, ruffled, bi-colored flowers with petals that are deep red-purple on the upper surface and white blushed with pink on the lower surface. `BAIcer` blooms abundantly in May and June and then recurrently throughout the season. The upright rounded plant habit with foliage resistant to black spot and mildew make `BAIcer` well suited for the landscape. The new variety is readily propagated on its own roots and hardy in U.S.D.A. Zones 4 to 9.