Buy a freewheel and put it on the other side. I assume the bike already has a front and rear brake? If not, fit one.
A fixed hub can be used for a freewheel. It uses the same amount of threads as a fixed sprocket so it wouldn't be any weaker. From the second picture you posted it looks like a freewheel side - no threads for a lockring.
Buy a freewheel and put it on the other side. I assume the bike already has a front and rear brake? If not, fit one.
A fixed hub can be used for a freewheel. It uses the same amount of threads as a fixed sprocket so it wouldn't be any weaker. From the second picture you posted it looks like a freewheel side - no threads for a lockring.