Every day, I bike from downtown SF (work) to the top of Russian Hill (home) on a fixed gear bike (~1 mile, ~500ft elevation gain). About once every month or tw

Every day, I bike from downtown SF (work) to the top of Russian Hill (home) on a fixed gear bike (~1 mile, ~500ft elevation gain). About once every month or two, I bike 50-150 miles in a day, and don't find it problematic.