It's one thing to sit in a team's slipstream or ride the momentum of the peloton, but the truest measure of a cyclist is how he (or she) performs in an individual time trial (TT). On Friday, in Stage 5 of the 2007 Amgen Tour of California (TOC), 127 bicycle riders looked into the face of destiny to see who would crack and would emerge triumphant. When the dust settled, it had become clear to all that Levi Leipheimer (Discovery Channel) is the best bicycle rider in the TOC.

In an individual TT, it's just the bicycle rider against the clock. No drafting, no group tactics, no jockeying for a sprint finish, no using other riders for motivation. Finishing position is irrelevant, it's all about the time. It is cycling distilled down to its most primal essence: how fast can you go?.

Clip in sports fans, between the weather and the Amgen Tour of California (TOC), it's going to be a great weekend for cycling in the Bay Area.

Whether you're tackling Mt.Tam on your Saturday morning club ride or comparing yourselves to the pros with a summit of Stage 3's infamous Sierra Hill climb, pack the sunscreen today and leave the rain shell behind.

On Sunday at 1:00 p.m., the TOC starts with the prologue, a 3.0 kilometer time trial from the Ferry building to Coit Tower.