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So, I have read the pros and cons question, and the why it is more expensive question, but I didn't notice anything on how much more expensive it would be.

So, if I want to buy a high-end bike a little bit at a time, just how much extra will I pay for the fun of repeatedly upgrading my grandfather's bike?

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    I would figure that a bike manufacturer can make or purchase parts for maybe 20% of what you'd pay through a bike shop (ie, 5x markup). You can probably shop around on the Interweb and do better on some parts, but it would be rare to find less than a 2x markup. – Daniel R Hicks Apr 7 '18 at 18:45
  • If it really is your grandfather's bike, there may be a lot of component incompatibilities between you and your dream bike. – David Richerby Apr 9 '18 at 11:27
  • @DavidRicherby I should have known better than to joke in a SE question. The punchline here is "The groupset has been changed twice, the frameset three times and the frame once" – HAEM Apr 9 '18 at 11:32
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It’s hard to give a general figure for how much more expensive a self built custom bike will be, but it’s relatively easy (although time consuming) to figure out how expensive your build will be. Just make a spreadsheet of all the components you will need, and research the best prices online.

Don’t forget to factor in all the minor components like grips, cable and brake housing. Also factor in all the special tools you will need to buy (or rent from a local bike co-op).

The other thing to consider is the investment you’ll have to make in learning all about component compatibility. There are some compatibility things that are not trivial to figure out.

You will also have to learn how to install and adjust every single component on the bike. That's a fairly significant investment in time, both in research and learning and the fiddling around trying to get stuff working right.

If learning all that is part of your goal (and it’s a completely reasonable one) all well and good, just know what you are getting into.

It’s also possible to scour Craigslist, EBay and local forums for parts, but you really have to know what you are looking for to make sure you get compatible components that are not worn out.

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I think the question is too broad and too vague to be answerable. First, it’s unclear what you mean by components. Do you include the wheels, forks, handlebars, saddle, seatpost, and crankset? Essentially everything except the basic diamond frame? What component series are you talking about?

Note that some if not many if not most high end components require the frame be designed to take them. So they are essentially un-upgradeable to. So you can’t take your grandfather’s road bike and put top tier components on it as they won’t fit.

As far as the component discount between buying them on a frame and getting them individually, I’d figure around 50% but it’s more complex than that as it depends on the series level.

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