Commuters willing to try what surveys is one of the fastest methods of commuting in Washington's rush hour traffic - by bicycle - will have a chance tomorrow to join a bicycle "communter caravan" that will be spinning into the city from outlying areas.

The more than 35 caravans are part of Washington's Bike Days, a week of bike races, rallies and other events sponsored by area bicycle groups. Two events are scheduled on the Ellipse: At noon Friday there will be a rally, with bike demonstrations and speeches by several congressmen who are bicycle enthusiasts, and from 11 a.m. to 4 p.m. Saturday there will be a blue grass and beer bike rally.

Tomorrow's caravans, which will be led experienced bike commuters, will leave from 28 different suburban locations, including 10 in Montgomery and Prince George's counties, from 6:15 a.m. to 8 a.m. All will end at the Mall.

Montgomery and Prince George's departure points and times:

Montgomery:

Lake Shopping Center, Chevy Chase Bank & Trust parking lot, at 8 a.m.

Glen Echo, MacArthur Boulevard and bike path, at 7 and 7:30 a.m.

Brookmont, near Maryland Avenue and MacArthur Boulevard bike path, at 8 a.m.

Silver Spring, The Bike Place parking lot, 8521 Colesville Rd., at 7:30 a.m.

Prince George's:

New Hampshire Avenue and Sligo Creek Parkway, at 6:15 a.m.

Queen's Chapel Road and East-West Highway, Grand Union parking lot, at 7 a.m..

Rte. 198 and North Contee Road, at 6:15 a.m.

Greenbelt, Kenilworth Avenue and Crescent Road, at 6:45 a.m.

Clinton, Branch Avenue and Kirby Road, by Roy Rogers parking lot, at 6:15 a.m.

Clinton, Branch Avenue and Iverson Road, by Hot Shoppe Junior parking lot, at 7:30 a.m.