jumpingmoy

Hello guys i have problem with my chain always slipping out the chainring. My chain ring size is 53t and cog ring is 9t. I just installed it, and add a chain pulley tensioner to my single bike with shimano hg40 olive chains. Whats the solution for this problem? The chain lenght is ok, but each time i pedal some of the chain is not properly inserted to the chainring. Thanks guys

tomtomtom123

is the chain stretched? Is the chainring worn? Is the chain line in front the same as the rear?

jumpingmoy

Everything is new, i cant stretch more due it will touch my chain stay. I own a dahon dove plus. The chain line is a bit not straight with front and rear

tomtomtom123

No, I mean is the chain stretched too much, further than nominal link spacing? Each link is supposed to start out as 1/2 inch long. Normally, as the chain gets older and worn, the length will gradually increase, and then you are supposed to replace it once it gets over 1.0050 to 1.0075 times it's original nominal length. You should check to see if the chain is actually 1/2 inch link lengths. You can find many articles on the internet about how to measure this.

Then you should check to see if the chainring is the correct shape to fit the chain. wrap the chain around the chainring and see if a section of the chain lifts off the ring.
https://www.sheldonbrown.com/chain-wear.html

If the chainline is not centered, you should measure the difference. If it is very far off, then you should space the chainring or crank arm to match.

splithub

I guess you refitted the 53T Chainring to it. If it is meant for use with a front derailleur, it has a pattern on the teeth to help switching the chain from the smaller chainring to it. Those are not working properly without the derailleur or a chain guide. Chain keeps dropping.

12boy

I am a little confused...is this a single speed? If so, are you using a wider chain such as 7-8 speed chain or a narrower chain as used for 10-11 speed geartrains? If the chain is too narrow it can't set down over the teeth in sprocket or chain ring. A also, a 9 tooth sprocket on a small wheel bike will wear very quickly and a new chain can skip or slip on a worn sprocket. If this bike has a derailleur they can be adjusted.

jumpingmoy

It is single speed, dahon dove plus 14inch bike. I am using shimanl hg40 chain. And have and chain pulley tension with 15t. Still cannot fix the problem

tomtomtom123

Which of the solutions did you attempt?
What was the result? Was there any change afterwards?
just saying that you can't fix it doesn't give us any new information.

Do you have photos and videos of the chain wrapped around the chainring, and showing the chain line? We can't see it.