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Sliding down when pushing the pedal
#1
Hello everyone!
Have a bit of a problem with my bike. I've decided to change my bike from multi-speed to a single speed. So i got myself freewheel 16 teeth 1/8", Chain Tensioner and single speed chainset (Sturmey Archer) 1/8" + bottom bracket 103mm that was added by seller. I've managed to put everything together, however this kind of problem came up:

When pushing the pedals - they are sort of slide down a bit - feels like chainset scrolling for a bit over axis with the pedal position on 3pm jumps to 5pm and after moving like it should till next pedal moving to the same position.

I am not quite sure what it is - any suggestion would be helpful!

Thanks!
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#2
It this happens over and over, the only thing I can think of is that the front chainring is not tight to the crank arm. If you can look down while riding, see if the chain stops moving for a second as the crank arm keeps going around. Or find a mark on the chainring that lines up with the crank arm and see if that is changing after a slip.

Most single cranks have the chainring either welding or bolted to the crank arms. But sometimes there is a nut that holds them tight against each other.
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#3
cross check with another wheel see what happens, if it strolls it is in the freewheel.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
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