Started out fine with new headset bearings installed by George Slough, but then noticed I had a slow leak in the rear tire while on Santa Teresa. Was able to pump it up some and thought that would be enough to get home, but it went completely flat just before getting to Metcalf on Monterey Rd. Walked to bike path just past Metcalf so I wouldn't have to fix the tire on the side of Monterey Rd, but that was slow since I didn't have the backpack with my sandals, so I went barefoot (with socks). Socks were dirty by the time I stopped, so I wore them inside out because I didn't want to get the inside of my shoes too dirty; I figure I can wash my feet at home. Tire went flat again shortly thereafter, so I put in another tube, but was only able to get up to 60 psi (I think my pump is getting old). Anyway, that got me home, but it was like pedaling through molasses on most of Santa Teresa and all the way home.