Coach Mike Nolan on Tuesday described the competition for the 49ers’ starting tailback job as “wide open’’ between Kevan Barlow and Frank Gore, and added that Maurice Hicks and rookie Michael Robinson also were making their presence felt.

“I want to see who that guy is,’’ Nolan said. “I’m wide open. I’m not closed at all. I have every reason not to be.’’

“Frank is pretty strong and he runs north-south all the time, hopefully a lot more north,’’ Nolan said. “Kevan is more of a shiftier back. He picks his holes a little differently than Frank does. All backs have their styles. There’s good backs that do it either way.’‘

[It’s `wide open’ in 49ers’ backfield] – Mercury News