Jul
29
I have a fairly cheapish mountain bike, recently I have found that when too much pedal force is excerpted, the chain seems to rise up and off of the front largest pedal gear sprockets.
Do I need to remove a link or two from the bike chain because the chain may have become stretched over time?
Or do I need to adjust the derailleur thus to increase chain tension?
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You don’t remove links to solve chain stretch, period. You replace the chain. Removing links doesn’t solve the stretch condition.
Check your derailleur adjustment. Check your chain for a twisted link. It will actually look like the front chain wheel is bent as the twisted part of the chain goes past as you turn the crank by hand with the rear wheel off the ground. Pedaling it fast will make it fall off, the same as under load.
Here is a link that will help you with your diagnosis.
http://www.parktool.com/repair/
Its probably not a case of tension.
Its more likely the teeth of the cogs are too shallow or the thickness of the chain is too wide.
Good Luck
it sounds like something is interfering with the chain path. make sure the derailleur isn’t rubbing the chain. as far as tension, it doesn’t really need too much. hard to say without actually looking at the bike.
Ok, some peopple are recomending that you change the chain or cassette. That’s fine if you wanna do that but… You must make sure to replace both the chain AND the cassette together or you really will have major chain slippage. Technically, you should change the sprockets too.
Most likely your gear teeth are worn out. Take a good look at them.
The chain tensioner keeps the chain tight. Taking a link or two out of the chain is likely to cause more problems.
Sounds like the deraillieur is out of adjustment to me. Either that or the cassette is worn out very bad.
Either worn sprocket teeth or try adjusting the range of the dereilleur.
There should be 2 small screws side by side, they stop the derailleur going beyond the sprocket so a bit of trial and error should do it.
http://www.slowtwitch.com/mainheadings/techctr/maintenance/derailleur_adjustment.html#Anchor-Front-35882
Check if the gears are compatible with the route you cycle recently (avoid/detour that route)
Check if the chain is clear from the derailleurs (adjust if rubbing against it)
Check if the gears are worn (you may have to replace if worn)
Check if the chain is stretched by usage (you may need to shorten chain/replace)
Check if the derailleurs are in order (missing screws, weakened spring)
It is probably not a tension thing as the rear derailleur will take that up. With cheap bikes you get cheap components and, sometimes, poor construction or assembly. It could be your chainring, chain or cassette need replacing or the front derailleur needs adjusting. Try your local bike shop as the most likely causes can be fixed for £10-£20.
Cycling for years.
ur cassette has probably worn down id say but a new chain and cassette on it will preform alot better the reason u have to chain both chain and cassette is because if u just put a new cassette on ur chain will still slip cus the chain was worn in with the old cassette
Probably worn sprocket teeth.
Just go downhill only and have good brakes.
First, make sure your front derailleur isn’t rubbing the chain. If its not then your chain is "stretched".
I put stretched in parenthesis because chains don’t actually stretch. If you look at your chain you will see that the links are held together with pins. As time goes by the pins wear down getting smaller and the holes get bigger. The spaces the gear teeth engage get larger and don’t engage the teeth completely causing slippage.
You cannot fix this chain, it must be replaced.
Since the problem has become this bad you will also need to replace the cog set on the rear which requires a special tool. If you don’t your new chain will wear out very fast. You may also need to replace the front chain rings but I would try to ride it with a new set of cogs and chain to see if it fixes the problem first. Front chain rings last a lot longer because their size means the were is spread out of more teeth.
Leave your rear derailleur alone, it is not the cause of this problem. Increasing the tension will actually only make the problem worse.
I have the same problem and mine is a Schwinn 21 speed as well. Looks like alot of suggestions, please let me know what worked to fix the problem.