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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-22-09, 12:32 AM   #1
WoundedKnee
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Fixed Gear drivetrain questions etc.

About a month ago my girlfriend decided to give me a frame(it says American Flyer on the front, not really familiar), she and her dad completely took it apart before she gave it to me. This was a mistake, I believe. Mainly because I'm really confused about the bottom bracket stuff, as I am new to bike mechanics.

I've learned alot in the past few days, but i'm still not entirely sure what I need.

If I measured right the width of my shell is 70mm. What else do I need to know, and will it effect what cranks I am able to get? (http://www.eighthinch.com/mm5/mercha...=cranksets_bbs)


I will appreciate any and all help, this will be my first time building a bike.
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Old 06-22-09, 01:04 AM   #2
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Let me introduce you to Mr. Sheldon Brown (RIP)

http://www.sheldonbrown.com/

His website is the bicycle bible, it has an immense wealth of knowledge well worth your time to read... it's an enjoyable read too.

I strongly recommend you have a good read as it will be an invaluable reference tool for your first build. Come back here if you still have questions or don't understand something.
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Old 06-22-09, 01:31 AM   #3
WoundedKnee
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Thanks, that's where I've learned most of what I know. He's not alive? :[

The bb stuff has just got me confused though.
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Old 06-22-09, 05:43 AM   #4
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You might want to try the bottom bracket measurement again. 70mm is usually an Italian threaded bottom bracket, highly unlikely on a bike badged "American Flyer".
Seems there's a new company using the American Flyer name, but it used to be a Schwinn brand based on a limited Google search. If that's the case, then you'll have pretty limited options for bottom bracket/crankset. Check this Sheldon article.
http://www.sheldonbrown.com/opc.html
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Old 06-22-09, 05:46 AM   #5
HandsomeRyan
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Originally Posted by WoundedKnee View Post
Thanks, that's where I've learned most of what I know. He's not alive?
In addition to having a great website, he was also a contributing member to this forum. He was every every bit as intelligent and helpful as people say he was.

Unfortunately, Sheldon went on to become Jesus's bike mechanic on Feb. 4, 2008.
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Old 06-22-09, 06:29 AM   #6
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The image of Jesus tearing through my town on a well-tuned, super tarcked-out fixie will be with me all day.

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