Danny Haynes broke the deadlock for the Robins after 33 minutes, cutting inside Christophe Berra and slipping the ball past Wayne Hennessey with the outside of his foot.
It was 2-0 to the Championship side five minutes later as Nicky Maynard turned 30 yards out and unleashed a fierce drive into the top corner.
Hennessey kept the scoreline respectable as he pulled off a stunning save to keep out Lewin Nyatanga's point-blank header.
Wolves' new-boy Nenad Milijas impressed, seeing a well-struck shot tipped around the post.







