33F and a bit of headwind. Had to ride the 29'er because a plastic shopping bag destroyed my derailleur last night. There was a stiff crosswind and I saw the bag blowing my way and of course thought I could beat it - wrong. It went straight into the rear wheel, ripped off the rear derailleur cage and twisted the chain. After picking out pieces of bag for 15 minutes I realized there was no fixing it and started walking. It was a loooooong walk