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what happens after chain slip off chainring while riding

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what happens after chain slip off chainring while riding

Old 06-15-19, 05:37 PM
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what happens after chain slip off chainring while riding

curious since i just switched to single chainring only.

i read if i delete the FD, the chain might fall off while shifting.

so, it is benign event?

or will greasy chain wrap around my foot and sully my shoes?

or will chain drop into the spokes and explode?

what is the risk of FD delete?

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Old 06-15-19, 06:14 PM
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If you're using a narrow-wide chainring, the chain isn't coming off. If you're using a "normal" chainring and some kind of keeper, the chain isn't coming off.

If you're using a normal chainring and no keeper, if the chain comes off you can usually pedal the chain back on-- unless the chain dropped to the inside and wedged itself against the BB or crank spider.

Drop to the inside, shift to a smaller cog and pedal the chain back on. Drop to the outside, (usually) just pedal it back on.
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Old 06-15-19, 07:13 PM
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Originally Posted by DrIsotope View Post
If you're using a narrow-wide chainring, the chain isn't coming off. If you're using a "normal" chainring ...
i oreded a Shimano SG 53t chainring from Ebay. is this the type that will come off?
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Old 06-15-19, 07:15 PM
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so it sounds like nothing catastropic is going to happen even if it comes off.
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Old 06-15-19, 07:18 PM
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Originally Posted by DrIsotope View Post
If you're using a narrow-wide chainring, the chain isn't coming off. If you're using a "normal" chainring and some kind of keeper, the chain isn't coming off.

If you're using a normal chainring and no keeper, if the chain comes off you can usually pedal the chain back on-- unless the chain dropped to the inside and wedged itself against the BB or crank spider.

Drop to the inside, shift to a smaller cog and pedal the chain back on. Drop to the outside, (usually) just pedal it back on.
The entire Team Aqua Blue Sport racing squad (only UCI squad to use SRAM 1X, and used NW rings), would challenge this assertion....probably with some foul language

i read if i delete the FD, the chain might fall off while shifting.

so, it is benign event?
It can cause frame damage to carbon frames or wheel damage.
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Old 06-15-19, 07:21 PM
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Originally Posted by mtb_addict View Post
i oreded a Shimano SG 53t chainring from Ebay. is this the type that will come off?
Yes. Erm, maybe? Lookup Narrow Wide rings. Or, find older rings from the mid 80s that have just a plain tooth profile.
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Old 06-15-19, 07:27 PM
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I don't mention anything about racing in a non-racing context, because what happens in a race is meaningless outside of that race. Racers beat their equipment to death through a combination of ignorance, apathy, and desire to win above all. What happens to racers in a race is meaningless to 99% of us.

I've never dropped a chain with 1X. I've dropped chains on 2X, inside and outside, countless times. If the implication here is that 1X drops chains with anything approaching the frequency of 2X, that is simply false.


Originally Posted by mtb_addict View Post
i oreded a Shimano SG 53t chainring from Ebay. is this the type that will come off?
That's a normal outer ring for a 2X or 3X crank (pins for shifting) so you would want some type of chain retention device if you want to ensure you don't drop a chain. Lots of bolt on and clamp on chain keepers out there. I use one from Paul Components, a little pricey but exceptionally well made.
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Old 06-15-19, 07:29 PM
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Originally Posted by mtb_addict View Post
i oreded a Shimano SG 53t chainring from Ebay. is this the type that will come off?
You bought the wrong thing. That is a standard road chainring intended for a double crank and a front derailleur. It will not be secure enough for use without a front derailleur. In fact it has shifting ramps and teeth shaped specifically to assist shifting.

Look up "narrow-wide" chainrings intended for 1X drivetrains and buy one of them.
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Old 06-15-19, 08:49 PM
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My yellow bike has a 1x drivetrain and a "wrong" chainring. Yeah, the chain falls off. I looked up the narrow-wide ring, and it makes sense, but I just haven't bothered with it yet. Meanwhile, I developed a pretty good sense of the conditions that cause the chain to fall off, namely back-pedaling in the longer gears, so I just don't do that any more and it's been OK. Usually it just goes slack and hangs there until I slow down and stop, then I find something by the road, like a stick, and push it back on.
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Old 06-15-19, 08:58 PM
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Originally Posted by mtb_addict View Post
so it sounds like nothing catastropic is going to happen even if it comes off.
If you're stomping on a pedal when the chain drops, very bad things are apt to. happen
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Old 06-16-19, 04:31 AM
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Originally Posted by LesterOfPuppets View Post
If you're stomping on a pedal when the chain drops, very bad things are apt to. happen
You can have a very bad fall if it happens at the wrong time.
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Old 06-16-19, 06:50 AM
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Ride what you have for a while to see if you have any issues. It's likely that chain drops will be infrequent if you are riding on relatively smooth surfaces and your RD puts sufficient tension on your chain (you probably have to remove a few links when you go single in front). Chain drops are not likely to be dramatic, although I had once one that confounded my ability to sort out). Because of that single incident I opted for a narrow-wide ring, even though I had over a thousand miles without incident.

Good luck.
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Old 06-16-19, 07:40 AM
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Originally Posted by Gresp15C View Post
My yellow bike has a 1x drivetrain and a "wrong" chainring. Yeah, the chain falls off. I looked up the narrow-wide ring, and it makes sense, but I just haven't bothered with it yet. Meanwhile, I developed a pretty good sense of the conditions that cause the chain to fall off, namely back-pedaling in the longer gears, so I just don't do that any more and it's been OK. Usually it just goes slack and hangs there until I slow down and stop, then I find something by the road, like a stick, and push it back on.
Same experience here. Don't backpedal to gain ground clearance while riding over something that bounces the bike harshly.

Otherwise, the chain drops and in my case it tends to go between the frame and the chainring/crank.
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Old 06-16-19, 07:48 AM
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Don't let these bikers fool you. If you drop a chain, you WILL end up in the hospital.
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Old 06-16-19, 09:05 AM
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Originally Posted by trailangel View Post
Don't let these bikers fool you. If you drop a chain, you WILL end up in the hospital.
I haven't had that happen yet. Granted, the chain drops I've had didn't jam in the spokes and stop the rear wheel from freewheeling.
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Old 06-16-19, 09:17 AM
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Its a 'spoke protector' unless you feel superior, to your mates , then its a 'dork disk'..
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Old 06-16-19, 09:22 AM
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Originally Posted by trailangel View Post
Don't let these bikers fool you. If you drop a chain, you WILL end up in the hospital.
It doesn't have to be hospital all the time, but a couple of knee-to-stem and knee-to-bar incidents have had me wishing I was skipping the hospital and headed straight for the undertaker.
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Old 06-16-19, 09:28 AM
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Originally Posted by FiftySix View Post
I haven't had that happen yet. Granted, the chain drops I've had didn't jam in the spokes and stop the rear wheel from freewheeling.
That's not required to get you a trip to the ER. It could be your foot comes off the pedal as the chain drops and frees up your cranks, then your knee hits the stem and your foot gets trapped in front of the pedal, while your hands slip off the bar and you start to tumble face first for the ground.
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Old 06-16-19, 09:39 AM
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Originally Posted by LesterOfPuppets View Post
That's not required to get you a trip to the ER. It could be your foot comes off the pedal as the chain drops and frees up your cranks, then your knee hits the stem and your foot gets trapped in front of the pedal, while your hands slip off the bar and you start to tumble face first for the ground.
I haven't had that scenario playout yet.

Probably because my chain drops were while back pedaling over hard bumps and and the chain locked up the cranks immediately when resuming forward pedal power. It basically turns my bicycle into a motorcycle with footpegs, but no throttle. So, I'd brake or coast to a stop and reinstall the chain. Only harm to myself was riding away with greasy hands.

I know not every chain drop would be the same for everyone, but I do know that a chain drop is not a guaranteed trip to the hospital.
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Old 06-16-19, 09:45 AM
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Originally Posted by FiftySix View Post
I haven't had that scenario playout yet.

Probably because my chain drops were while back pedaling over hard bumps and and the chain locked up the cranks immediately when resuming forward pedal power. It basically turns my bicycle into a motorcycle with footpegs, but no throttle. So, I'd brake or coast to a stop and reinstall the chain. Only harm to myself was riding away with greasy hands.

I know not every chain drop would be the same for everyone, but I do know that a chain drop is not a guaranteed trip to the hospital.
Yep, backpedaling and light pressure forepedaling incidents are typically less dramatic.

Foot retention can also help to reduce likelihood of a bad situation, but not prevent such situations - I've kneed stems with SPDs on.

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Old 06-16-19, 10:26 AM
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Originally Posted by trailangel View Post
Don't let these bikers fool you. If you drop a chain, you WILL end up in the hospital.
Don't worry. Try as I might, I haven't fooled anybody yet.

I should have noticed the OP's user name. I'm almost 100% pavement cyclist, with occasional forays into the woods. I know what my bikes are capable of. The times when I've dropped a chain on my particular bike have been under no load. Honking up a hill on the smallest cog is something that I'm not strong enough to do anyway. Likewise with the dreaded no-gear on the old Sturmey Archer AW hub. You had to be a fairly athletic cyclist to even be at risk of that failure mode.

But if @mtb_addict is talking about riding an actual MTB under rugged trail conditions, that's not my bailiwick.
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Old 06-16-19, 10:39 AM
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no, i am talking about road biking.

i rarely do mtb anymore.

which reminds me i did do a very techical trail once, full of roots and rocks.
i was riding a converted single-speed with a very bad chainline.
the chain came off every time the back wheel hit a root hard.
but since, i was usually going walking speed, i just step off, but sure someone not as agile as i am might fall hard.
i did recall thinking if the chain gets jammed into the frame in bad way, then i was for sure walking back to the car.

then, i converted that mtb to 1/8" chain and chainring...corrected the chainline with a new wheel...and it never dropped a chain afterthat.

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Old 06-16-19, 11:02 AM
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All of this debate on the consequences of a chain drop; inconsequential, minor, bad, very serious and life-threatening, would be moot if you just use the proper chainring. Narrow-wide chainrings are readily available and not very expensive. Buy the right thing and be done with it.
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Old 06-16-19, 11:35 AM
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Even a non-NW single speed ring might do for light pressure seated pedaling.
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Old 06-16-19, 12:20 PM
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Originally Posted by mtb_addict View Post
no, i am talking about road biking.
Curb hopping will make a single front chainring's chain come off on a bike with a rear derailleur. Just don't backpedal to level the pedals for ground clearance during the curb hop. Get the pedals set before the hop and landing, then pedal away.

Or, get an internal gear hub bike with a single rear sprocket to go with that single chain ring.
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