It was a nice day for racing. Had a decent start but somewhere around the first turn the valve stem on my rear tire decided to seperate from the tube. Results: instant flat! Luckily, there is an outfit at the races that (among other things) has a complete tire changing outfit. It took them less than 10 minutes to replace the tube and install a beefier rim lock (the stock rim lock was completely tacoed). When I got back into the fray I was a lap down, but was able to gain a few positions (16th out of ~20). So ... replace those cheap stock rim locks!