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Sorry, I just re-read that, it was a little confusing, even to me..
Basically, it all depends on the frame you using for your bike (not the donor).
Typically, newer frames that utilize a 3-piece crank with multi-speed rear hubs have a smaller bottom bracket tube compared to the 'classic' single speed frames.
Now, if you can find a vintage '5 speed' donor bike with a single front sprocket, a 1-piece crank and a multi-speed rear, then everything should move over to the 'final' frame with no problem.
If you find a 'modern' donor, like a mountain bike, with a 3-piece crank (the number of sprockets is irrelevant) and a multi-speed rear, chances are you'll need the bottom bracket adapter. The adapter reduces the internal size of the bottom bracket tube down from a 1-piece size to the modern (or euro) 3-piece size.
Hope that makes more sense..
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Hmmm... How do I explain this where someone who has done such a thing will not try to argue with me on their reason for doing so? This will be a challenge.
If a bicycle is so unergomatic , so heavy and so inefficent that its top speed is only slightly more than a crawl then having multiple gears on it is redundant. Finding a comfortable gear ratio for such a bike I imagine is a very specific task. Having multiple gears on one is pointless.
Sure is. Thankfully when I have done so I can pass it off as artistic license. Thank God for Rat rod bikes
I used to lean forward and crank with all my mite. I haven't felt I can trust the modern setups like that, Especially the derailer types. I might trust the high end components. But I can build several bikes for that kind of ching ching!
Americans will sacrifice ride and safety for looks.
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