Keith Barker bagged a goal in each half to give Glyn Hodges side a two goal cushion but Birmingham fought back to earn a point with two goals in the final 15 minutes.
Rovers: Drench, Barr, Taylor, Harkins, L. Jones, Nolan, Watt, Byrom, Derbyshire, Barker, Hodge. Subs: Kane, Fielding, Garner, Woods, De Vita.
Birmingham: Dormand, Parratt, Alsop, Oji, Painter, Diao, Asa Hall, Carter, Morrison, Till, Birley. Subs: Meredith, James Blake, Howland, Cottrill, Wright.