WHERE THERE'S SPOKE: Neighborhood Bike Works' executive director Andy Dyson. : Michael T. Regan

The treacherous slalom is part of a bike safety course, the final class of a seven-week program that teaches kids from low-income West Philadelphia neighborhoods how to build, repair and safely ride bicycles. Neighborhood Bike Works' young disciples may be pedaling too frantically to notice, but the program is about more than tinkering with bikes and winning slalom races. For Seay and the others, the winding course to adulthood is just beginning, and second chances aren't always so easy to come by.

"At least two kids in this year's classes have fathers incarcerated for murder," says Andy Dyson, the program's executive director. "Most of these kids have only one parent or don't live with their parents." Some of Dyson's students themselves have had trouble with the law, and he sadly admits that "probably every one of them will be arrested at some point."

One student was recently caught stealing a pair of BMX wheels from the program's workshop. Rather than kick him out of class, Dyson gave the culprit a long talk and a shot at redemption. "When you're a teenager, fucking up is pretty much your job description. It certainly was for me," says Dyson, who emigrated from London 23 years ago to work as a bike mechanic. "But when kids see that we understand and that we're willing to give them a second try, that can sometimes be a chance to develop a special connection."

In one of Bike Works' two repair shops—a cavern lined with bike tools and parts, hidden beneath St. Mary's Episcopal Church on the west edge of Penn's campus—the same would-be thief focuses intently on a small steel cylinder. Ben Straub, a tattooed 23-year-old with shaggy blond hair, holds the metal piece aloft and asks the assembled class what it's called.

"That's a barrel adjuster," the student answers.

He's right.

"Nerd," someone mutters audibly.

"It's not nerdy to know how to fix a brake," Straub corrects in a friendly tone. "It's practical."

Bike Works' instructors, chain-grease-encrusted twentysomethings who generally live on the outer edge of University City, like to use the word "practical." "Unlike some schools, we teach practical things that you can apply," says Ricky Perez, another of the program's young teachers. "If the kids are learning about bottom brackets, they can actually walk across the room after the lesson and overhaul their bottom bracket."

Practicality, argues Dyson, is what makes bike repair the ideal microcosm for teaching problem-solving skills to teens. Aside from being immediately useful, fun, fitness-related and capable of propelling disadvantaged kids out of their sometimes dangerous neighborhoods, bicycles are also uniquely amenable to do-it-yourself repair. The tangible success of fixing a bike drives home a lesson that Bike Works' students might not learn elsewhere: Hard work and know-how produce real benefits.

"Our goal is to provide a difficult but do-able task," Dyson says. "If you're one of these kids, living with your dad may not be a do-able task. Putting a bike together is."

Neighborhood Bike Works now faces a difficult task of its own: staying afloat financially. After recently celebrating its 10th anniversary, the nonprofit program plans to diminish its classes—for the first time—by about 10 percent. Despite filing more grant applications than ever, Bike Works is struggling to scrape together much-needed funds. Dyson laments recent stock market dips and natural disasters like Hurricane Katrina, which have siphoned away much of the foundation money on which Bike Works depends.

Dyson has set his fiscal hopes on two city government programs: Steps to A Healthier Philadelphia and the new Adolescent Violence Reduction Partnership, both of which may give Bike Works grants this fall. But he also sees the need to transition from dependence on charitable foundations and government grants to soliciting donations from individuals, who now provide only 15 percent of the program's funds.

Although Dyson is forthright about the causes of Neighborhood Bike Works' current financial straits, he's quick to point out that the program is more than a novelty amidst a sea of worthy charitable projects. As he searches for the words to convey the unique virtues of bike-related education, Dyson reverts momentarily to his former life as a bike mechanic and frame designer.

"You can touch and see nearly all their moving parts, and in that sense bikes are very simple. But on the other hand, a 20-pound bike can move a 200-pound person by way of this matrix of wires and steel tubes, linked together with ancient machine principles. … It's really a beautiful and harmonious thing," he muses, waxing nostalgic for the decades he devoted to the perfection of bicycle minutiae.

The next second, he's back in the world of youth development and nonprofit administration: "For these kids, some of whom can't afford a SEPTA token, a bike is even more than all that," he says. "It's a ticket to freedom."