The San Francisco 49ers hope to have a more productive offense built around Colin Kaepernick in 2015.

The 49ers promoted Geep Chryst to offensive coordinator this week.

"It's not fixing Kaepernick," Jed York said. "I think Kap is an unbelievable player. He's a young guy that continues to grow and mature, but we all do."

Greg Roman was offensive coordinator of the 49ers last season.

"But with Kap you got a guy in Geep Chryst who knows him better than anybody else," he said. "You have a great guy in Steve Logan that's coming in that's going to work with him on fundamentals and to put a system that's going to put Kap in the best position to make plays.

"How many quarterbacks in this league can run 90 yards for a touchdown? I can't think of many, but you have to put Kap in position where he can make those plays and put Kap in position where we can run the ball. We can throw the ball in ways that allows him to be successful and let him be the absolute stud that he can be on the field, and that's what you're going to see from us next year. Defenses are not going to want to play against us because you're not going to know where we're going to hit you."