Dodgers fans certainly know about Madison Bumgarner.

He was a key performer as the San Francisco Giants won the World Series in 2010, 2012 and 2014, and especially in the latter, when he gave up only one run in 21 innings and won Games 1 and 5 and threw five innings of scoreless relief in Game 7.

Yes, that MadBum.

World Series MVP in 2014, 4-0 with a save in his World Series career. Who has started 270 regular-season games for the Giants, become recognized as one of the greats in the club’s long history and never taken a trip to the disabled list.

Till now.

This is not about the typical “exploding (fill in applicable joint or ligament)” suffered every day by someone who throws baseballs for a living. Instead, it was about a bad decision on a day off in Colorado.

On April 20, Bumgarner went dirt-bike riding outside Denver with a couple of relatives and, he said, after two hours of riding suffered a bad spill.

Bad as in bruised ribs and a Grade 2 separation of his left (throwing) shoulder, with a partial tear.

The Giants today confirmed the severity of the shoulder injury and said Bumgarner would not be ready to pitch until “around” the All-Star Game, which this year is on July 11. That is, he will be out nearly three months. And maybe more.

Presumably, his Giants contract contains some of the standard language about risky off-the-field activities, but the Giants do not seem at all interested in punishing him.

They have made the right decision.

Bumgarner has been the Giants’ main man for most of this decade, especially once another left-handed ace, Tim Lincecum, faded, beginning in 2012.

The big, backwoodsy Bumgarner never missed a start in his big-league career. He was the club’s ace of aces; any difficult assignment, like matching up with the Dodgers’ Clayton Kershaw, went to him.

The club loved him and his consistency. He contributed to a Giants clubhouse where a sense of professionalism, quiet confidence and stability was apparent, during a time when the Dodgers searched for those qualities but never could replicate them.

Bumgarner has apologized to the team and to fans. That is as expected, but maybe it helped chill out the front office.

Also, the Giants have been underpaying Bumgarner for years.

He is is in the final season of a five-year, $35-million contract, which may have seemed tidy when he signed it 2012 but has been recognized as chicken feed in the wake of “Kershaw, seven years, $215 mill” and “David Price, seven years, $217 million” and various other enormous deals for quality pitchers, like the one that last year brought Bumgarner a new teammate, Johnny Cueto — six years for $130 million.

Giants officials have to be unhappy that Bumgarner, their 27-year-old ace, who really ought to know better, decided to risk his health on a dirt bike.

But at the same time, they know what he has done for the club, and what he means to their fans and how he never begged off in difficult circumstances — such as that epic, five-inning relief stint to wrap up the World Series in 2014, stranding the tying run at third base.

And they know that many of his best years have been taken up by a contract that averages $7 million a season.

Thus, no apparent punishment. No fine. No hard words, even.

That is the right way to handle this.

Bumgarner has given the Giants so much, and at so little cost, that it would be churlish to do anything more than wince and hope their ace is ready to return, come the middle of July.