It was your first 10-speed bicycle. You bought it in a blinding moment of vigor and resolution, probably as the sun was shining outside. You rode it like a fiend on weekends for a while, and then on Sundays, and then on Sundays when there was nothing else to do. You thought of riding it to work, but the air turned cold and the roads were congested and anyway, you couldn't figure out where to put the attache case.

As of today, you are the victim of a conspiracy.

This week, by proclamation of the D.C. mayor's office, is Bike Week. "Whereas the tenets of the Clean Air Act should be observed," as the proclamation says, and "Whereas bicycling is fun," the D.C. Department of Transportation and a small army of diehard bikers are all exhorting commuters to try riding in to work.

All week long, the D.C. Bicycle Hotline (629-4386) will dispense information and encouragement for beginning bike commuters. And on Friday, (rain date Monday, April 18) veteran bikers will lead commuting groups into downtown Washington from points all over the metropolitan area.

Here are the meeting points for the Friday morning bicycle contingents:

ARLINGTON

1. Thomas Jefferson Junior High School parking lot; 125 S. Old Glebe Rd., 6:30, 7:20, 7:45 and 8:10 a.m.

2. Lyon Village Shopping Center parking lot, Lee Highway and Spout Run Parkway, 7:30 a.m.

3. Westover Branch Public Library, 18th and North Lexington, 7:15 a.m.

4. National Orthopedic Hospital parking lot, 2455 Army-Navy Dr. (meet in lot between 24th and 29th Sts.), 7:30 a.m.

5. Amoco Gas Station at Wilson Boulevard and George Mason Drive, 7:30 a.m.

ALEXANDRIA

6. Brad-Lee Shopping Center Safeway parking lot, King Street and Braddock Road, 7:00 and 7:45 a.m.

7.Sailing Marina, GW Parkway, 7:30 a.m.

8. Seminary Plaza Shopping Center, Safeway parking lot, Seminary Road and Library Lane, 6:30 a.m.

9. George Washington Masonic Temple, between King Street and Duke Street, 7:30 a.m.

BAILEYS CROSSROADS

10. Columbia Pike and Dinwiddie Safeway parking lot, 7:45 a.m.

11. Culmore Shopping Center, Route 7 between Baileys Crossroads and Seven Corners, 8:00 a.m.

ANNANDALE

12. Woodburn Elementary School, Gallows Rd. at Hemlock, at the Beltway, 7:00 a.m.

CHEVY CHASE

13. Firehouse, Wisconsin Avenue and Bradley Boulevard, 8:00 a.m.

14. Chevy Chase Circle Safeway parking lot, McKinley Street and Connecticut Avenue, 7:00 a.m.

15. Chevy Chase Bank and Trust Co., Chevy Chase Lake Shopping Center, Connecticut Avenue and Manor Road, 7:45 a.m.

TAKOMA PARK

16. Closed gas station, New Hampshire Avenue at Sligo Creek Parkway, 7:30 a.m.

SILVER SPRING

17. The Bicycle Place, Colesville Road one block south of Georgia Avenue, 7:30 a.m.

HYATTSVILLE

18. Grand Union parking lot, Queens Chapel Road and East West Highway, 7:00 a.m.

GLEN ECHO HEIGHTS

19. Glen Echo parking lot, MacArthur Boulevard, 7:15 a.m.

DISTRICT OF COLUMBIA

20. Cleveland Park Congregational Church, 34th and Lowell Streets, 8:15 a.m.

21. 18th Street and Columbia Road parking lot, 7:30 and 8:00 a.m.

22. Eastern Market, 7th Street and North Carolina Avenue SE, 8:30 a.m.

23. Lincoln Park, 12th and East Capitol Streets (NE & SE), 7:30 and 8:15 a.m.

24. Northeast branch of D.C. Library, 7th Street and Maryland Avenue NE, 8:00 a.m.

25. Tenley Circle Library, Wisconsin Avenue and Albermarie Street NW, 7:30 a.m.

26. Takoma School, Piney Branch and Cedar St. NW, 7:30 a.m.

27. Mt. Pleasant Street and Lamont Rd., 7:30 a.m.

28. Holly Farms Chicken Carryout, North Capitol Street and New Hampshire Avenue NW, 7:30 a.m.

29. Robert F. Kennedy Stadium fringe parking bus stop, East Capitol Street, 8:00 a.m.