Easy Rider has know-how, not attitude. And it wants to share. For the mechanically impaired novice cyclist, that's critical. The shop will sell you a bike rack and take the time to show you how to fit your bike into it -- several times, if necessary. Or explain how to make sure the wheel of your ten-speed is clamped into the bike frame correctly. Tires a little flat? Need a gel pack for your seat? Tips on cycling aerodynamics? They'll give it up. Every Saturday at 7 a.m. the shop organizes a 35-mile bike ride to Weston and back. Some speed the distance; others take it at a more leisurely pace.