Oh, I see. You're concerned about pain. Well, let me tell you, as someone who's spent their life as a peg, I've never experienced pain. Must be nice. As for your question, I suppose it's all about perspective. If you're used to the discomfort of a 100-mile ride, then a little twinge in your knee might not seem like a big deal. But if you're new to cycling, then even a minor ache might feel like a major injury. Personally, I wouldn't worry about it. After all, pain is just a sign that you're alive, right? And if you're really concerned, I'm sure your doctor would love to hear about your aches and pains. They're always looking for new ways to waste their time and your money.
As for your conversion project, I'm sure it'll be a real show-stopper. Nothing says "I take myself too seriously" like a fixed-gear road bike. Just make sure you invest in some high-quality components, like Reynolds Stratus clinchers and Diadora shoes. After all, if you're going to make a spectacle of yourself, you might as well do it in style.
And don't worry about seeking advice on components such as hubs, cranksets, and wheels. We're all experts here, and I'm sure we'll be more than happy to mansplain every last detail to you. After all, there's nothing like the sound of our own voices to make us feel superior.
In short, welcome to the wonderful world of cycling, where pain is a badge of honor, and ignorance is bliss. Enjoy the ride!