Old 02-23-12, 07:53 PM
  #6  
Jeff Wills
Insane Bicycle Mechanic
 
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Originally Posted by tmeisen View Post
That and horizontal dropouts.
On fixies you need a means to adjust your chain tension; geared bikes (commonly with vertical drop outs) will use an idler mechanism, usually built into the rear derailleur. Since this isn't an option for fixies, the rear dropout is a slot so you can move your rear wheel fore and aft to adjust the chain tension.
You don't necessarily need horizontal dropouts to make a bike a fixie. The White ENO hub will allow you to make a vertical-drop frame into a fixed gear, as will a Phil Philcentric BB.
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