rear gear wont keep straight

Sitherus

Active Member
Joined
Apr 4, 2016
Messages
252
chain keeps falling off. I've looked at all the forums and i know it has been discused. I know i need to get the rear gear on perfect in parallel to the single speed one on the other side and in parallax to the engine. I know all of this from practice and time put in from my many builds and never wanted to go back to a spoke mounted gear again but my customer is super mad at me because the bike breaks every ride we go on. either the right side chain falls off or the left side does.

so heres what happened.
The right side streched on my single speed coaster brake bike and kept coming off because it was too loose so i removed a link from both sides then adjusted the dropouts.
then i couldnt go more than 2 feet just rolling the bike without the left side pulling off. It was too tight and just slightly off.
like milimeters off! Then i was like f*** this after working on it all day and the customer calling every 5 minutes to ask if it was ready and stating "I want my money back" all day in 95 degree weather and just put it back to the way i found it. Now the left and right side fall off and i cant keep them on to save my f***ing life!

I really need help I have until 3pm tomorrow to fix this and im so tired and i hurt everywhere i just want it to be done.
motorized bicycles used to be fun!
 


darwin

Well-Known Member
Joined
May 26, 2008
Messages
3,279
Chains don't stretch they wear from a lot of use. Tight chain means too damn tight, out of adjustment or needs a link added. Sprockets if lined up properly and at 180deg you should have no issues. To me proper chain tension is a 1/2 to 1in movement up and down on the bottom of it. Is the motor/tranny sprocket lined up correctly, straight and parallel? It's not rocket science to figure it out. Take a deep breath and start off fresh to evaluate it. Seems to me the chains too tight and something is not aligned properly. Eye ball it from the rear holding the rear of the bike up so you can see the chain travel all the way to the front. Are both axle nuts centered on each side the same? Take pics and post them from every angle. A lot of people here to help you.
 

inspectorcritic

Well-Known Member
Joined
Dec 13, 2015
Messages
1,132
No they do too stretch been to a chain gang company first thing they do is throw it out on a table and measure it count the links on what it should be and tell you chain has stretch this far.
 

Frogslayer

Well-Known Member
Joined
Jan 20, 2019
Messages
637
The chain isn't "stretched" the barrels that the pins go through are wore out and that lets the chain increase in length as you pull the pins all the way to one side or the other. The side plates will measure the same. This is all nitty gritty and syntax but just saying lol. A bad chain is a bad chain.
 
M

Member 28982

Guest
chain keeps falling off. I've looked at all the forums and i know it has been discused. I know i need to get the rear gear on perfect in parallel to the single speed one on the other side and in parallax to the engine. I know all of this from practice and time put in from my many builds and never wanted to go back to a spoke mounted gear again but my customer is super mad at me because the bike breaks every ride we go on. either the right side chain falls off or the left side does.

so heres what happened.
The right side streched on my single speed coaster brake bike and kept coming off because it was too loose so i removed a link from both sides then adjusted the dropouts.
then i couldnt go more than 2 feet just rolling the bike without the left side pulling off. It was too tight and just slightly off.
like milimeters off! Then i was like f*** this after working on it all day and the customer calling every 5 minutes to ask if it was ready and stating "I want my money back" all day in 95 degree weather and just put it back to the way i found it. Now the left and right side fall off and i cant keep them on to save my f***ing life!

I really need help I have until 3pm tomorrow to fix this and im so tired and i hurt everywhere i just want it to be done.
motorized bicycles used to be fun!
I like to put 2 or 3 master clips in my chain. Keeps it tight enough w/ light slack and the rear sprocket needs to be tightened like u do an 8 lug truck rim. Nice and tight and straight up centered with engine drive sprocket until you can't turn any of the nuts anymore. Make it true.
Chain tensioners are worthless so remove it. Bet you see immediate improvement from what youve been doing
 
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