A New PR

I've had my new bike almost a month now, and today I really wanted to see what it could do. So I did one of my favorite rides, the 15-km Loveville Loop. My previous best (on my old bike) was about 32 minutes. I was pretty certain that I could break the 30-minute mark on the new bike, so that was my goal.
I was flying along, really trying to push it. I know that course well, so I know where I can power through and were I need to ease back. And even though my seat post came loose with about a mile to go (and in fact when I finished my seat was all the way down to the top bar), I made it in 27:37. Imagine if I hadn't had the Incredible Shrinking Seat.
Then I tried to do a transition to a run. Wow, what an eye-opener! I had to stop maybe a tenth of a mile in, my legs hurt so bad. It was partly the whole bike-to-run thing (biking is mostly about leg extension, and running is about contraction), and partly because I went way too fast. I just felt like I was going so slow compared to the bike.
So there's a lesson learned.