On the back half of the bike course on the 2012 Mont Tremblant Ironman.
On the second lap, I hit a personal cycling speed record of 92 kph.
A bike seat is a very personal choice. You spend a lot of time on one of the five contact points between you and your bike. If it isn’t working for you, there will be a lot of pain and discomfort during all those hours spent training and racing. Also, if you aren’t comfortable, you’ll lose efficiency and by inference speed which equals time on your bike split.