Great Neck cycling enthusiasts are invited to meet at 6 a.m., Monday through Friday, at the corner of Grace Avenue and Bond Street, for four-and-a-quarter hour local bicycle rides, at a minimum average speed of 13 mph. Routes and distances vary according to the group; rain cancels the ride. The rides continue until November. To confirm, call David (Speedy) Emanuel the night before, at 840-9370, days, or 487-8065, until 9:45 p.m.