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Bike chain falls off when I back pedal

Old 06-14-23, 07:06 PM
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Bike chain falls off when I back pedal

I have a Kent 700c Nazz Gravel Road Bike, 10 speed .
this literally happened today i did a weird turn and i started pedaling and the chain came off i put the chain back on but i noticed that when ever i would back pedal
the chain would come off or if i stopped pedaling the chain wouldn't rotate like it should does any one know whats wrong or how to fix it??
best way i can describe it lol.
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Old 06-14-23, 07:15 PM
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I'd wager your freewheel or freehub needs attention.
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Old 06-14-23, 07:47 PM
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You forget to mention if its the crank or the cogs it falls off of. I the back, you probably need to check the rear der adjustment but also having too much resistance in the der pulleys from grit can cause the chain to sort of back up on the top of the cassette and them drop off into the frame. With the front, the crank may not have a proper alignment, you'd have to replace the bottom bracket which may not be economical. Another possibility I've seen, if the problem is in the front, is that a chainring may be bent. With the chain off spin the crank while looking down the side plate of the front der, you should be able to watch the chainrings either stay in line with the der or have a wobble, if there's a wobble you've found your issue. If they're riveted steel rings they can be persuaded straighter with some light tappings from a hammer, just move in stages.
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Old 06-14-23, 07:55 PM
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I am guessing that the bike has never seen a mechanic and the parts on it aren't designed to work well from the factory. The bike needs service but for the price of a tune up which is what the bike really needs you are probably close to the price of a new one or at least half way.

The freewheel is probably having issues but I can almost guarantee the bike is going to continue to have problems all over without proper service. If the bike is able to be returned you could do that and save the money towards a bike that is less likely to have problems or at least has good support behind it. If not consider either fixing the bike currently at a local shop or purchasing a new one either the same thing with the same likelihood of issues or a bike that is less likely to have problems as listed above.
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Old 06-14-23, 08:46 PM
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Kent Bikes are the Most Trouble-Prone Bikes i know of.

And I Agree with every possible issue mentioned in the above responses.

i'll add this possible issue..the chain that was installed on the bike at the factory may already be "worn out"... how many miles you've ridden the bike does not matter.. The chains act "Worn out" straight from the parts bin at the factory.

all the cables will rust the first time they get damp.
all the bearings are either bone dry or have such a low quantity of lousy grease on them that they would be better off dry...
every nut and bolt is the lowest quality possible to save a few cents per bike.
the paint has already begun to fade.
the handlebars will rust as quickly as the cables.
the handgrips will turn to mushy goo after a couple months if exposed to the sun.

Good Luck.

Last edited by maddog34; 06-14-23 at 08:56 PM.
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Old 06-14-23, 08:46 PM
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You are the proud owner of what we all like to refer as a BSO.
It's not your fault you purchased a BSO, you were fed misinformation and can be excused.
When purchasing a BSO, one must also purchase product insurance.
Not purchasing product insurance leads to the situation you're in now.
A "unit" that is not worth the sum of it's parts. 20-25 bucks for product insurance is a guarantee that you will get a second BSO for the low low price of free.
Buy more product insurance on the new one because the same thing is going to happen, it's the nature of the beast.
If you'd like to purchase an actual bicycle come back and we can help you there.
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Old 06-14-23, 10:52 PM
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Originally Posted by violentnerd161
I have a Kent 700c Nazz Gravel Road Bike, 10 speed .
this literally happened today i did a weird turn and i started pedaling and the chain came off i put the chain back on but i noticed that when ever i would back pedal
the chain would come off or if i stopped pedaling the chain wouldn't rotate like it should does any one know whats wrong or how to fix it??
best way i can describe it lol.
Best way to fix it? Take it back to where you bought it and get your money back, then go out and pay whatt it costs for a good bike
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Old 06-14-23, 11:37 PM
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Originally Posted by maddog34
Kent Bikes are the Most Trouble-Prone Bikes i know of.

And I Agree with every possible issue mentioned in the above responses.

i'll add this possible issue..the chain that was installed on the bike at the factory may already be "worn out"... how many miles you've ridden the bike does not matter.. The chains act "Worn out" straight from the parts bin at the factory.

all the cables will rust the first time they get damp.
all the bearings are either bone dry or have such a low quantity of lousy grease on them that they would be better off dry...
every nut and bolt is the lowest quality possible to save a few cents per bike.
the paint has already begun to fade.
the handlebars will rust as quickly as the cables.
the handgrips will turn to mushy goo after a couple months if exposed to the sun.

Good Luck.
All of that + an Assembler making 3 to 5 bucks a bike to build 60+ bikes a day. Not conducive to high quality there.
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Old 06-15-23, 06:36 AM
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Kents were right up there with Huffys and Murrays, as I recall.
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Old 06-15-23, 08:55 AM
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Unfortunately the OP didn't ask for advice before he purchased his BSO (bicycle shaped object, a term used to describe bike of questionable quality in case the OP doesn't know). Also unfortunate that not everyone can afford something better than what's sold at Walmart. He would definitely been better off with a used brand name bike, but it's too late for that unless he can get a refund, learn a few things at a local bike shop, save some money, and stay away from big box stores.
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Old 06-15-23, 10:11 PM
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Big box store bikes = live with it.

Simply don't pedal backwards on it anymore
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Old 06-16-23, 09:49 AM
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Originally Posted by violentnerd161
i would back pedal the chain would come off or if i stopped pedaling the chain wouldn't rotate like it should does any one know whats wrong or how to fix it.
Sounds like the freewheel is dragging - try squirting some WD40 in the back of it and spinning it until it frees up. If that doesn't work a new freewheel doesn't cost much. You'll also need a freewheel tool to change it over, and something to turn it (bench vise, adjustable wrench etc.) It will be easier to service the freewheel if you take it off the wheel, you could start with just the freewheel tool and WD40, then buy a new freewheel if that doesn't work.
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Old 06-16-23, 11:15 AM
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Pawls in all freewheels and freehubs become sticky from oils drying up, or seized from inside rust.

Since BOS are almost always freewheels, sometimes I can get release fluid in from the drive side of the freewheel, so I don't even have to remove the wheel from the bike at all.

If that's a no go, it's impossible to shoot oil from the opposide side because of the wheel hub or dork disc. The freewheel must be removed to access the gap of the bearings there. That is usually protected and clean of grime so release oil seeps in easy from there.
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Old 06-16-23, 11:22 AM
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Here's the freewheel removed from the wheel hub, and view of freewheels from both sides, showing the obvious areas to apply the penetrant.

To service this particular freewheel, the nut on the top with the two holes is clockwise to remove.
Attached Images
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Old 06-16-23, 12:45 PM
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Originally Posted by soyabean
Big box store bikes = live with it.

Simply don't pedal backwards on it anymore
I went to the doctor, I said, "It hurts when I go like that." He said, "Don't go like that."
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Old 06-17-23, 07:33 AM
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I have a feeling the OP isn't going to service his freewheel and probably won't be back to the forum. Too bad.
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Old 06-17-23, 11:21 AM
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I agree to not service his freewheel, since my suggestion would be to buy a bike that uses a freehub/cassette instead.

The only reason why I service freewheels is because these are bikes I flip. I do both relatively very fast.
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Old 06-19-23, 08:52 AM
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Originally Posted by soyabean
I agree to not service his freewheel, since my suggestion would be to buy a bike that uses a freehub/cassette instead.
I've been surprised to find freewheels on some reasonable quality bikes, I'd have thought they'd be restricted to BSOs. I suppose the average buyer of an "entry level" MTB or sport bike isn't sufficiently knowledgeable to insist on a freehub, and price matters, but how much difference can it make to the manufacturer's cost?
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Old 06-19-23, 09:36 AM
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Originally Posted by grumpus
I've been surprised to find freewheels on some reasonable quality bikes, I'd have thought they'd be restricted to BSOs. I suppose the average buyer of an "entry level" MTB or sport bike isn't sufficiently knowledgeable to insist on a freehub, and price matters, but how much difference can it make to the manufacturer's cost?
I mean at those points the frame is usually a good step up from a BSO but the parts are similar. Manufactures do silly things, Jamis for instance makes a bottom end Coda but instead of just keeping it the same with cheaper parts they literally have a different frame that is 1" threaded and had to get quill stems for it while everything else is 1 1/8 threadless. I could think of tons of ways to make that same cheap bike but just use the Coda Sport frame and fork or just start with the Coda Sport (or S3 now or whatever).
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Old 06-19-23, 11:16 AM
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Originally Posted by Schweinhund
You are the proud owner of what we all like to refer as a BSO.
Do "we all like" to call them that? More likely I'll feel bad that someone spent money on a bad cycling experience, when with a little more knowledge and a good LBS or helpful neighbour they could have had a positive experience.
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Old 06-19-23, 11:18 AM
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Originally Posted by grumpus
Do "we all like" to call them that?
Better BSO than POS.
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Old 06-19-23, 11:54 AM
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Originally Posted by smd4
Better BSO than POS.
BSO is something that mechanics can agree on - it's a matter of basic functionality. OTOH POS is somewhat subjective, IMHO.
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Old 06-19-23, 11:59 AM
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Originally Posted by smd4
Better BSO than POS.
One of the mechanics I worked with had a story where he was writing a ticket and wrote POS on it and the older folks who picked it up were like "look honey we know what bike it is, it is a Pos" Not as it is POS as we know it but that is the brand of the bike.
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Old 06-19-23, 12:07 PM
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Originally Posted by grumpus
Do "we all like" to call them that? More likely I'll feel bad that someone spent money on a bad cycling experience, when with a little more knowledge and a good LBS or helpful neighbour they could have had a positive experience.
Ok, everyone but you.
As smd4 said above, better a BSO than a POS.
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Old 06-22-23, 02:45 PM
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Man, so much arrogance on this site

Vintage bikes still have freewheels, mainly because cassettes had not been invented yet.

And even high end bikes can have issues with chains jumping cogs when pedaling backwards.

Pro Bike: Katie Compton's CrossVegas Trek Boone with Shimano Di2, Mechanical Disc Brakes and Knight Composites Wheels (cxmagazine.com)
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