San Francisco is not a city that suffers from a lack of bicycle stores, but there are times when even our abundant retail outlets fail to stock what avid cyclists are looking for. If you're on the hunt for a rare frame, a vintage fender, or a chain for your home-built Franken-bike, try the VeloSwap. With 100,000 square feet of cycles, accessories, and parts, it probably has what you need.
Modeled after the 15-year-old Colorado event of the same name, this year's expo debuts in our city with scores of vendors from around the bay offering special deals on gear and clothing, while experts conduct giveaways and free clinics. Looky-loos can watch free screenings of Scott Coady's 2000 Tour de France travelogue The Tour Baby!, meet cycling celebrities Graham Watson and Bob Roll, and see a performance by those two-wheeled masters of mayhem, the San Francisco Bicycle Rodeo. Things get rolling at 9 a.m. at the Cow Palace, Geneva & Santos, S.F. Admission is free-$8; call (800) 811-4210 or visit www.veloswap.com. -- Joyce Slaton
SkiJourney Some like it cold
The recent (and instant) change in the seasons took us all by indignant surprise. One day it was hot, and the next it was freezing. But talk about a cloud with a bright white lining -- skiers have been whining about the heat for at least a month, and now snow bunnies of all stripes can reap the benefits of chilled precipitation.
Welcoming the cold weather is an annual event for Warren Miller. His films are the ski equivalent of the surf movie Endless Summer, only they really are endless: Journeyis the series' 54th incarnation. Miller's 19 film crews follow the snow all year, looking for good technique and totally sweet powder shots from Aspen to Morocco. Featuring 73 different skiers, this year's flick also includes a tribute to snowboard icon Craig Kelly. Defy frigidity at 6 p.m. at the Palace of Fine Arts, 3601 Lyon (at Bay), S.F. Admission is $15.50; visit www.warrenmiller.com. -- Hiya Swanhuyser
It's Getting Hot in Here
When reports of a strange new scientific phenomenon dubbed "global warming" first hit the news, even some environmentalists scoffed. Several decades and many long, hot summers and strangely mild winters later, few still find the matter amusing. With official sources predicting a 5.8-degree temperature rise this century -- higher than the climate change that began thawing the last ice age -- even naysayers are beginning to believe. Get the spin-free 411 on the climatic transformation at "Global Warming: Global Warning?,"a one-day forum featuring a plethora of experts. Come hear what the warming trend means for all of Earth's creatures at 1 p.m. at the California Academy of Sciences, Golden Gate Park, 55 Concourse (at JFK), S.F. Admission is $10-20; call 750-7128 or visit www.calacademy.org. -- Joyce Slaton