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  1. #1
    Join Date
    Jan 2015
    0 Post(s)
    0 Thread(s)

    Considering purchasing a Powertap, need education on assumptions I have.

    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.

  2. #2
    Senior Member
    Join Date
    Jan 2006
    8 Post(s)
    0 Thread(s)
    Training and racing with Power can be a worthy option if you are willing to regularly test yourself and review your training zones and training based on this.

    Before dropping the $$$, I'd recommend you buy Training and Racing with a Powermeter 2nd edition. Even if you like the idea of numbers and metrics outside of cycling, if you read the book cover to cover and still keen I'd say go for it.

    1. Or buy a prebuilt wheel. Note just because your bike is Shimano make sure the hub is forward compatible. Meaning a 11 speed shimano hub can fit a 10 speed cassette using a spacer but cannot fit an 11 speed cassette on a 10 speed hub. So if your current bike is still 10 speed shimano, still buy an 11 speed shimano compatible powertap in case you go 11 speed later. Note you could also go with 10/11 speed SRAM as they both use the same spacing and freehub design.

    2. Again - as long as the powertap can take 11 speed, you will be able to use the same wheel on both bikes even if one is 10 speed and the other 11 speed shimano. You will just need to change cassettes. You can also buy a disc cover and use the same wheel in TT's.

    3. Spoke holes in rim and hub do need to match (you can lace different hole counts if need be with some combinations) but if you are buying new match hub and rim hole numbers. You are correct - strength, weight and aerodynamics.

    Not wanting to sway you either way, but why are you set on a powertap?

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