A friend and I were asked to escort several hundred runners through a hilly 10 kilometer loop today. As a mile of the course was rocky dirt we used our commuter bikes. On the flats was fine but on the first 500 foot climb the 3 leaders passed me. On the next (300 foot) bump 4 more caught me but I stayed with them. Mind you I am only an average recreational club cyclist, 25-30 lb over-weight, with a heavy bike loosing air from the front tire yet I climbed with these whippet-thin teens and 20 somethings. Descending a twisty mountain road on a nearly flat tire was exciting but I caught and passed number two. My pal stayed with the leader we were escorting. I left my pal to do the expected sag loop as I fixed the flat. The leak was through a free foam backed instant patch I had gotten on Bike to Work Day. Covered it with a proper Rema patch.