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Back wheel cogs keep coming lose how do istop this

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There are several makes and types of rear cogs on typical bikes. Without specific information it would be hard to be specific.

You could go to parktool.com (they make all the special bike tools) and look around for advice.

http://www.parktool.com/repair/readhowto.asp?id=48

A Local Bike Shop would be your best bet for both a fix and a lesson.

Posted on Aug 05, 2010

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I cannot get my chain to stop coming off. How do I keep the chain from slipping off?


Loosen the nut that holds the back wheel and pull it back until the chain is tight and then retighten the nut. If when the chain is tight, the wheel is not on the rear frame, you need to take a link out of the chain.

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Nishiki bravo bicycle will not engage gears when pedalling


has the cog seperated or snapped off the wheel as in can you freeturn the wheel and make the cog go around or does the wheel spin but the cog doesnt move,
if so your up for a new rear wheel/cog

Jan 28, 2013 | Cycling

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I just cant get used to changing gears,why is there two levers, one on each side of the handle bar.I end up with the chain coming off frequently.


Angie, Have patience. It will come to you. There are two levers, because there are two places where the gears change - in the front (by the pedals) and on the back wheel. You might find it easier to just use one lever. Do this--- have someone help you hold the bike so that the back wheel is off the ground. Turn the pedals on the bike and work one shift lever at a time so that you can see which lever is for the front vs. the rear. If you have three gears in the front (the correct name is chain-rings) then leave the front one so that the chain is on the middle chain ring. If there are two, then select the larger one. Now shift the back one (the gears back there are called cogs). You might have 5,6,7 or even 8 cogs back there. Practice shifting the back cogs to see what is happening. If you find that the chain comes off, even when you leave the front on on the middle chain ring, you need an adjustment. Good luck! Al K

Aug 12, 2011 | Shimano Cycling

1 Answer

Took chain off to remove wheel and am unable to get chain back on correctly. 2001 Magna oasis 26" 7 digit shifting speed. Unablew to locate manual...can you help?


Put the chain to the inside of the front cog wheel, beside the pedals, first but not onto it, so you have plenty of room for pulling the chain to the rear. Fit the wheel back into place and before tightening it pull down the spring loaded arm, with the small cog wheel beside the back wheel. This takes the tension off the chain and allows you to put it into place on the back wheel. Tighten up the wheel. When it's tightened fit the chain onto the top of the front cog wheel. Lift the back wheel off the ground and turn the pedals forward. The chain will click onto the front cog wheel when you have turned the pedals one complete turn.

If you need to see a picture of how it should look at the back you can see one at http://orangecounty.craigslist.org/bik/2409696114.html

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1 Answer

Hello could you please advise on how to get the back wheel sprocket off. thanks tony


Depends on whether it is a freewheel or free hub.

For a freehub, you need a chain spanner -- basically a long lever with chain on it to hold the large sprocket while you use a second one to unscrew the smallest cog. Once that is off, all the other cogs slide off.

For a freewheel (usually only on older bikes), if you look inside the smallest cog, you'll see some sort of a recess. On Suntour it would be 2 recesses to accept a 2-pinned removal tool. For Shimano, it is a splined remover that fits around the axle. Insert the freewheel removal tool, use the Quick release to hold it in place, and a large wrench to unscrew the freewheel. In this case the entire freewheel comes off in one piece. Once off, you can use the method for the freehub to remove the outer cog and each successive inner cog. Often it is easier to put the removal tool in a vice and turn the wheel rather than use a wrench.

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1 Answer

My bicycles chain fell down,and I cant put in on again, Do you know some repairer who can repair it,around the Leytonstone or maybe near it? Many Thanks.


There's a trick to putting a chain back on a bike. First fit it onto the back wheel. Then hold it on the top of the front cog wheel (at the pedals) Get someone to lift the back of the bike so the wheel is off the ground. While the wheel is off the ground and you're holding the chain on the top of the front cog wheel turn the pedals forward, with your other hand, as when you're cycling and as it turns the chain will go on.

If you don't have someone to hold the back wheel up off the ground you could hold the chain on the bottom of the front cog wheel and turn the pedal backwards. The chain will still go on.

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1 Answer

I'm a 60 year old female. Only just learning to ride a bike. Husband been riding for 60 years and doesn't seem to understand my problem! I have a bike with SI-6KT0B gears. I understand the principles of...


Congratulations on learning to ride the bike. I use the rear gears mainly i.e. the gears on the right hand side. Each rear gear makes a little difference so it makes it a little easier to go uphill. (When the chain is on the back smallest cog wheel it's hardest to pedal and easiest on the largest. The reverse is true of the front cog wheels) If you come to a very steep hill you should use the front gears i.e. the lever on the left hand side. This makes a bigger difference to the effort needed to climb a hill. When you have put the front gear into the easiest position, (on the smallest cog wheel) you can still use your rear gears to make it easier still. For going on flat ground or downhill most people keep both sets of gears on the hardest gear. (The front gears on the largest cog wheel and the rear one on the smallest) However there's no rule that says you have to. Use the one that feels you're using just enough energy to turn the pedals and in time you won't have to even think about the gears. I hope this helps.

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2 Answers

Car starts but sometimes makes a whirling noise. I was told it was the starter


sounds like the starter is not disengaging the fly wheel quickly like it should when you turn the key the starter cog connects upto a fly wheel that has teeth all around it when the teeth of starter cog connect between teen on wheel it spins it to crank your car then goes back to starter if you hold your key on after starting the noise you hear is the starter cog(teeth ) still engaged in wheel if this is the sound it needs to be serviced not neccassarily replaced

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Husqvarna Vikinge Designer I thread cutter keeps going out


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