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What is a suicide hub?
#1
Overheard a guy at the lbs say he was using a suicide hub on his bike?
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#2
They were used on old road bikes. Pretty much all the threads on the drive train are the same way. So when you backpedal, it starts to unscrew everything
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#3
It's when you put a track cog onto a hub made for a freewheel. Since there is no lockring, if you back pedal, the cog could unscrew which would mean zero braking power.

There are ways to jerry rig a lockring on a hub like this that are not too bad. But I wouldn't recommend riding a bike set up like this without at least one handbrake regardless. Other than the backpedalling issue, there's nothing inherently dangerous about it.
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