Culture change no accident for revamped roster

IN ANY business, when a plan comes together, the world is a much brighter place. Coming into the winter, the Mets knew they would have the freedom to make moves.

Most importantly, Sandy Alderson & Co. wanted all the moves to make sense from a talent and a clubhouse chemistry perspective, a marriage of numbers and personalities.

“Addressing the clubhouse started with our selection of Mickey [Callaway] as the manager, but was a factor in our signing of every player we added or brought back,’’ Alderson told The Post.

The Mets are off to a 10-1 start for the first time in their history and begin a homestand Friday night against the Brewers and Nationals.

So far, the plan has worked to perfection with the free-agent signings of Todd Frazier, Jay Bruce and Adrian Gonzalez. Jose Reyes has yet to get a hit (0-for-11), but Callaway said his contributions cannot be measured by performance.

It was about the makeup and talent of the players. That’s why the Mets wanted Bruce back in his prime. He is a perfect New York fit.

“I think all of us, from the coaching staff to the front office, wanted quality guys, not just guys that can play,’’ Callaway said. “When it came down to level of play being even, we wanted the guys that were going to come in like Frazier, Gonzalez and Reyes, those guys make a huge difference on your team.

“Reyes hasn’t even played that much and he is on the bench cheering, bringing energy in BP, bringing energy for [Amed Rosario], those guys make a difference.’’

Callaway said Frazier has brought tremendous leadership, noting, “He’s going to straighten the ship.’’

Assistant GM John Ricco told The Post, “It’s been really interesting to watch us come together over the six weeks of spring training and then into the season. When you are putting the team together the challenge is to find that mix, and you never really know how it’s going to work out until they do come together.

“We had a lot of discussions about how you want a blend of young and old players, you want a blend of new and returning players. We lost a lot of free agents so we talked about bringing guys into the clubhouse who could provide some leadership. We had a little bit of a blank page.’’

Ricco said it was important to get players, like Frazier, who would shake up the clubhouse a bit, saying, “that’s something we haven’t had enough of the last few years.’’

Frazier is hitting . 222 and has yet to hit a home run, but is in t he middle of the action. The Mets picked up the option on Asdrubal Cabrera and he is off to a .333 start while Michael Conforto, who wasn’t even expected back until May is batting .333. Bruce (.256) and Gonzalez (.296) have both hit grand slams over the first 11 games as well.

Yoenis Cespedes is batting .178, but has gotten some big hits.

Frazier has a simple philosophy Cespedes has embraced as well.

“All you do is worry about your next at-bat and you worry about helping the team,’’ Frazier said. “You play the game and do the little things right. Mickey has shown a lot of confidence in the hitters and the pitchers and I love that.’’

Callaway and pitching coach Dave Eiland have done a terrific job of getting the pitchers to attack and have made impactful changes to the deliveries of Matt Harvey, Jeurys Familia and Zack Wheeler.

The Mets have the lowest ERA in the NL with a 2.47 mark. They are second in the league in both starting pitchers’ ERA at 3.17 and relievers’ ERA at 1.49.

The Mets have six come-frombehind wins, the most in the majors and have allowed two or fewer runs in seven of their 11 games. They’ve won their first four series for only the second time in team history (2006) and the first six road games of the year for the first time.

The plan and personalities are off to a terrific start.