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Ongoing 1x chain drops

Old 05-06-19, 07:39 AM
  #1  
rosefarts
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Ongoing 1x chain drops

I've got an older CX bike that is all new/newish components. I set it up 1X.

Awhile back I posted that a 12-36 cassette seemed to dramatically reduce the number of times I dropped my chain over the 11-42. Maybe true, maybe coincidental.

I'd like to start racing this bike at some low key but long gravel events. I did the first in the series yesterday on my road bike yesterday and was wishing I had brought the rowdy bike instead. The trouble is that the chain drops are a little unpredictable and I haven't been able to fully solve it.

I got a Chain Guide but the plastic guide part doesn't have clearance between the crank and chainring so it rubs. I managed to kludge a decent guide using aluminum channel. I only dropped the chain once (in many rides) with this thing but I had to take it off to get the chain back on. I haven't put it back on but I may.

I'm don't fully trust my Narrow Wide chainring either. It's a J&L from ebay, they're cheap but one of two brands that make 135 bcd Campy N/W rings. The other is Stone, they look much nicer but are still just another unknown brand.

I have an SLX derailler with the on/off switch. I think it helps a little but I'm not sure.

Given these variables, what are my options to keep this stinking chain on. For my more adventurous rides, I don't mind stopping a few times to put it back on. For a decent size group ride, it's a totally unacceptable situation.
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Old 05-06-19, 08:14 AM
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fietsbob 
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Older cyclocross bikes for single ring, fitted a disc chain-guard on both sides of that single ring,

then once offered, a chain minder from around seat post , replaced the inner disc..
outer discs offered in carbon fiber sheet. or aluminum

you also might just center a front derailleur over that 1 ring , without a cable attached to it ...


there are quite a few chain retaining add on devices by now..
like from K-Edge https://k-edge.com/product-category/chain-catchers/


Last edited by fietsbob; 05-06-19 at 08:22 AM.
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Old 05-06-19, 08:26 AM
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fietsbob 
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Of course in cyclocross, bike's low gear; is you getting off and running , with the bike, shouldered,
.. rather than gear down and get passed, every lap..
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Old 05-06-19, 06:12 PM
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rosefarts
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I said in the first post, I hope to do more gravel events with it. Not cyclocross.

Anyway, there arenít any 135bcd ring protectors that i know of. I could fabricate 2 of them if it becomes my only choice.

I may have solved the problem today, my chain was too long. I managed to shorten it by 3 links and it still works fine. No ride today since my bottom is still stressed from yesterday but iím hopeful.
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Old 05-06-19, 08:39 PM
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Paul Chain Keeper

Not cheap. But perhaps worth it. I've been running one since I went 1X, and have never dropped a chain. Can't say that was all due to the Paul Keeper, but I also can't say it didn't help.
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Old 05-07-19, 08:55 AM
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Originally Posted by fietsbob View Post
you also might just center a front derailleur over that 1 ring , without a cable attached to it ...
Snort, chuckle. So the solution to problems brought on my the simplicity of a 1X system is to revert to the derailer you got away from to go to that 1X system?
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Old 05-07-19, 09:04 AM
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Then, I got away from derailleurs .. 11.42 cassettes ? marketing loves you ..
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Old 05-07-19, 09:14 AM
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Turn that clutch on the RD ON.
Make the chain as short as allowed. For SLX it is big cog + 2 links.
Install proper NW chainring.
Unless you put layers of mud on the chain, it won't fall off.
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Old 05-07-19, 09:45 AM
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Originally Posted by pdlamb View Post
Snort, chuckle. So the solution to problems brought on my the simplicity of a 1X system is to revert to the derailer you got away from to go to that 1X system?
It only causes problems when it moves.
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Old 05-07-19, 05:48 PM
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Kapusta
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Your sure the clutch is working? It should be pretty obvious when moving it by hand whether it is doing what it is supposed to when you turn the switch to ďonĒ.
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Old 05-21-19, 04:38 PM
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Update.

Yes the clutch works.

With the chain shortened by 3 links I still managed to drop it a few times. Amazingly, I managed to shorten it another link and it doesnít rub, even on the 42. I donít dare go shorter.

I replaced the Campy square taper BB with an IRD. Itís very shiny. Itís also longer and JIS, that added up moving my crank out enough that I can switch the ring from outside to inside. The chain line is about 3mm right, this gives me a straighter chain in my highest gear (lowest der spring tension). It also opened up room to clear a chain guard, which I installed.

So to recap, shorter chain/wider chain line/guard. Side effect is my heels donít rub the stays.

I canít seem to knock the chain off on the work stand. Ill bomb it down something rough soon.
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Old 05-21-19, 05:43 PM
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why/when is the chain dropping? If it dropping off the top of the chainring or the bottom? The problem may be a sticky freehub combined with a larger heavier cassette, not the n/w or clutch. When you coast and freewheel with a larger cassette the inertia of the cassette will sometimes allow enough slack in the upper run of chain to start to derail the chain and then it will come off when you start pedalling again. This is a bit different than on bumpy terrain when the chain is more likely to bounce off the bottom run of chain on the chainring.
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Old 05-21-19, 07:22 PM
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rosefarts
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Originally Posted by redlude97 View Post
why/when is the chain dropping? If it dropping off the top of the chainring or the bottom? The problem may be a sticky freehub combined with a larger heavier cassette, not the n/w or clutch. When you coast and freewheel with a larger cassette the inertia of the cassette will sometimes allow enough slack in the upper run of chain to start to derail the chain and then it will come off when you start pedalling again. This is a bit different than on bumpy terrain when the chain is more likely to bounce off the bottom run of chain on the chainring.
I think it usually comes off in a higher gear when Iím not pushing super hard. It will also shake off an washboards, especially if Iím coasting downhill.

I think your theory is plausible. Itís a brand new one to me. I have a Bitex rear hub, it doesnít seem sticky but who knows.

I think itís a combination of factors.The chain guard is on, the chain line is better, and the chain is now 4 links shorter.

Only trouble now with the position of the guard, Iíll need to remove the master link from the chain to put the chain back on.
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Old 05-21-19, 07:31 PM
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For some reason, I mis-threaded the chain through my SLX derailleur (with respect to that little tab -- it goes behind, not in front). It worked well enough that I didn't think to check it for several months. I didn't drop chains because of it, but it felt a bit jerky at times. I would never suggest anyone else here is as stupid as me, but accidents can happen, so double-check. The tip-off for me is the clutch didn't work well when on. Since it was my first experience with a clutch derailleur, and because I stubbornly refuse to have fewer than two chain-rings on the front, I just assumed the clutch was incompatible with my setup, when in fact the problem was how I threaded the chain through the derailleur.
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