TAKE part in fun rides from eight to 45 miles, go for test rides on the latest in tandem and recumbent bicycles and compete in silly cycling contests at the Tandem and Recumbent Bicycle Fun Ride and Demo Day, Sunday from 9 to 4 in Mount Airy, Md.

"In the morning we will have rides of different lengths," said Linda Black, owner with her husband Larry of Mount Airy Bicycles, which sponsors the event. "The shortest ride is eight miles and the longest is 45 miles. We have two different people guiding the rides. The rides will take place on the rolling hills around here."

Tandem bicycles, she explained, are bicycles built for two and recumbent bicycles are used by one or two persons who ride while sitting in a reclining position. "We'll have 40 to 50 bicycles for people to ride. At 12:30, we'll have a potluck lunch. We're asking everyone who comes to bring a dish that will serve four times the number of people in their party. We won't turn away anyone who doesn't bring a dish, but that just means we may be short of food."

After lunch, she said, the focus will be on games. "We'll have a tandem toss, to see who can roll an unmanned tandem bicycle the farthest; a tandem tug of war; a tandem egg race -- who gets farthest without breaking the egg -- and a tandem slow race. And we're having demonstration rides all day. They will start about 10."

The festival takes place at 1870 Long Corner Rd., Mount Airy. From the Capital Beltway, take I-270 north to I-70 east. At Exit 68, take Ridge Road/Route 27 south, turn left on Penn Shop Road and right on Long Corner Road. The festival area is a mile ahead on the right. Admission to the festival, the bike rides and demonstrations are free, but registration is encouraged. Riders must wear helmets. Call 301/854-6876 or 410/489-4902. You can also register at the Web site: www.bike123.com.