I need a major education on bike components, hubs, and wheels. Particularly with regards to buying a Powertap hub. I honestly know very little about all of this stuff and with the prices of gear you can make some pretty expensive mistakes. I don't have the money to purchase the sort of bikes “Tri/TT” others seem to have so it seems I will stick with my road bike for the time being. I do have some money however to invest in my training. Which I think serves me better at this stage. As someone who just wishes to finish and constantly improve, training correctly is where my focus has to be.
I would love to train with a power meter based on what I am learning about that. It seems to make a lot of sense to me and as an engineer I love numbers and metrics.
So my questions..
1. If my road bike has all Shimano components then it would appear a Powertap hub that is “Shimano” would be needed to build a wheel for my bike correct?
2. If I could purchase a Powertap for Shimano and build a wheel for my road bike around it am I wrong to assume that when the day comes I could purchase a Tri/TT bike and if it was also Shimano based that I could have a wheel built using the Powertap hub for it also? The point obviously is to avoid purchasing something now that can't be used later. Not sure if that's possible but it sure would be nice as none of it is cheap.
3. What the heck is up with all the various hole counts on hubs? I am assuming that you have to coordinate your hub hole count with the hole count in a rim. But the number of holes / spokes of the wheel itself won't really matter to a bike. It's not like your bike can only have a wheel with X number of spokes. What's the point of so many hole count options? Strength? Weight? Aerodynamics?
Appreciate any insight others can provide. I have so much to learn and I'm grateful I have a place to ask my questions.