Fixed Gear Bikes Need Less Maintanance
Unlike new bikes on the road, a fixie doesn't have much moving parts so maintenance is a breeze.

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You Can Stand In Place
When you stop at a light instead of having to put your foot down you can do a track stand where you balance on your bike with both feet on your pedal. Freaking awesome
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You can Ride Backwords
Not much usefulness here, but oh so much fun.
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Weighs Less so Easy to Carry
With less parts the bike weighs left making it ideal for lifting up and down your stairs.
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Chicks Dig It
Girls love fixed gears. I don't know what it is about them. Maybe that they streamline, maybe that they are dangerous, or maybe because they take skill to ride.
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OnMyList
List your pants off!