DETROIT -

Spots are filling up fast for an annual bicycle tour through some of Detroit's historic districts.

Fewer than 150 openings remain for riders in Saturday's Tour de Troit which takes bicyclists past city landmarks.

As of Wednesday, about 4,850 people had registered for the event, which raises funds to support non-motorized infrastructure in the city, including the Southwest Detroit Greenlink.

The cost is $50 per rider. Students pay $45.

The tour starts in Roosevelt Park in Detroit's Corktown neighborhood and features a 30-mile leisure course. A 62-mile alternative course already is sold out. The route will be closed to vehicular traffic.

Teams to help riders with directions, flat tires and minor repairs will be along the routes.