Known as the the Valley's fastest group ride, the BOS has been pounding the roads of North Scottsdale since 1981. Named for its starting point — the Bicycles of Scottsdale shop that has come and gone a few times at the corner of Scottsdale Road and Shea Boulevard — the weekly group ride pushes out every Saturday at 7:30 a.m. with upwards of 50 to 60 cyclists making up the peloton. The roughly 60-mile route can change slightly from week to week, depending on the moods of group leaders, but by and large, the ride rolls north along Pima Road toward Cave Creek, cutting east for some climbing loops on Happy Valley Road and Legend Trail. The ride continually ascends to the summit point on Cave Creek Road known as "The Tower," a house with a large microwave antenna, just before the turnoff to Bartlett Lake. The return trip is where the fast part comes in, as it is nearly pure downhill all the way back into Scottsdale, and this group moves. If the idea of riding in a bunch is a bit intimidating, the route still is among the Valley's best, cutting along the scenic high Sonoran Desert along iconic landmarks such as Pinnacle Peak and Reata Pass.