Doc Rivers said he wanted to learn more about “3-4″ guys before he made cuts and today he’s taking a look at everyone but Sam Cassell. With four minutes to go in the fourth quarter, Gabe Pruitt, J.R. Giddens, Bill Walker, Darius Miles, and Brian Scalabrine are on the court. This lineup is without a true center so they are pressuring on the perimeter to prevent a mismatch at the hoop. And just in case you thought anything has changed since last season, the fans are still chanting “Scal-a-bri-ne” every 30 seconds.

Like Brian Scalabrine last season, Darius Miles is in the habit of riding a stationary bike when he’s not on the court. It’s critical for him to stay loose during the game because of his long history with knee problems.

Miles was baffled too.

So there was confusion when Miles went to went to warm up four minutes into the second quarter and the bike was nowhere to be found.

He first asked Garden security and then hunted down strength and conditioning coach Bryan Doo. The bike was finally dragged next to the stands who two minutes to go in the third quarter.

“Get off the bike!” one fan yelled. “That’s reserved for Scal!”

The middle of the Celtics locker room always seems to be cluttered with a mass of rolling chairs, but rookies J.R. Giddens and Bill Walker have learned there aren’t enough to go around.

“Honestly I was looking for my jersey and then they were like, ‘Rookies got to share lockers,’” Giddens said.

No one's seat is safe

Giddens and Walker will be lockermates until the Celtics cut the roster down to 15. For now they share space next to Darius Miles and Rajon Rondo.

“We’re considerate of each other,” Walker explained. “We come in at different times so there’s never any congestion at the locker.”

So what will it mean when the rookies finally have their own space?

“It’s just a locker, but if I had my own chair that’d be the biggest change,” Walker conceded. “I’m sharing the chair with J.R. Five minutes on, five minutes off.”

Not quite.

“Actually we don’t even have a chair,” Giddens admitted with a smile. “This is somebody else chair.”

The Celtics better call fives when they leave the locker room.

Darius Miles was anxious when he moved to Boston last month. He had played here before on opposing teams but it’s a different story when you are representing Beantown. The city’s winning tradition was intimidating at first.

Miles hopes to be part of #18

“The last time I played there it wasn’t really a big deal because the team was losing games,” Miles said. “Like now just walking into the practice facility, it’s like it’s scary to a point because of the history that goes back on this team. Seeing all these pictures of Bill Russell and all these great players that used to play here and seeing those big banners, it’s different now.”

Through his six-year stint in the NBA, Miles already knew many of the veteran Celtics including Kevin Garnett, Ray Allen, Paul Pierce, and Sam Cassell. Knowing these players also meant knowing the high expectations of winning another championship this season.

“I’m a basketball fan so I kind of knew a lot about [the Celtics tradition],” Miles said. “Then once they brought a championship back, that kind of brought it all back to the world and everybody else and it kind of brought it back to my memory too. Like I said it got scary where I just don’t want to mess up, don’t want to miss a pass, drop the ball, miss a shot.”

After six weeks Miles has become more comfortable in his new digs. Doc Rivers has praised his hustle and he seems at ease in the Celtics locker room. Off the court, he has already staked claim of his new favorite restaurant, Biagio in Waltham.

No Mickey D's for Miles

“I like the family restaurants,” he said. “They don’t have too many name brand restaurants. There are a lot of family-owned restaurants around here, so the food tastes better and the people know how to cook.”

What else does Miles like about Boston?

“My favorite part is I like everybody’s accent,” he said, adding, “My mom came down here when I was sick (tonsillitis) and she was telling me she liked everybody’s accents too.”

So will this Belleville, Illinois native be pahkin the cah any time soon?

“No, I don’t think I’ll pick one up,” Miles said with a laugh. “I’m too country for that.”

Walker's picking basketball over birthday cake

How does a rookie celebrate his 21st birthday with the world champion Boston Celtics?

Bill Walker’s answer may surprise you.

“Oh man, I’ve got to guard against LeBron James and (Sasha) Pavlovic and all those guys tomorrow,” Walker said. “So I’m resting.”

Walker will lay low in preparation for Friday’s preseason match up against the Cleveland Cavaliers in Providence, Rhode Island.

Darius Miles also celebrated a birthday today, turning 28. Walker and a handful of teammates serenaded him before Thursday’s practice.