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What Can I Do to Stop My Chain Coming Off? |
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atlas_shrugged 
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Joined: 03 November 2014 Location: Cambs Status: Offline Points: 1025 |
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 Posted: 14 August 2023 at 5:27pm |
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Roy
You can buy chain-rings with integrated guards from Aligit a NL company. I have one on my Bachetta which has a guard only on one side. My guess is that you could get a chain-ring with a guard on both sides. Take some good quality photos and email them to Aligit and see what they suggest. Chains coming off the velomobiles you speak of are par for the course unfortunately. My chain fell off the chain-ring racing at Maasmechelen in my velo. This was very unfortunate because I was trying to keep pace with a rather good looking racer. Edited by atlas_shrugged - 15 August 2023 at 8:14am |
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atlas_shrugged
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Joined: 03 November 2014 Location: Cambs Status: Offline Points: 1025 |
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Posted: 14 August 2023 at 5:35pm |
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The other thing you can do to prevent chain-loss is glue foam pads underneath the chain. This stops the chain resonating at the fundamental frequency (think putting your finger gently on a guitar string to get a harmonic).
The foam does not need to touch the chain during normal operation but it should be close so operates only when you are banging over flipping UK pot-holes and not peddling (so the chain is slack).
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melle
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Joined: 07 February 2023 Location: Bath Status: Offline Points: 198 |
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Posted: 14 August 2023 at 6:41pm |
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I can highly recommend Alligt chainrings and idlers.
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Optima Stinger | 2x Baron
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RoyMacdonald
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Joined: 09 March 2007 Location: Rye East Sussex Status: Offline Points: 981 |
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Posted: 14 August 2023 at 8:32pm |
That sounds like a good idea to try first. Simple and possible without too much effort. Both chains? (Drive side and return) I'm a bit more positive about that than the chain ring with guards because it has to be happening before the chain gets to the chainring, otherwise how is it getting onto the pedal axle? If it was dropping onto the bottom bracket axle, yes chainring guards, but it's not. Thanks Brian. All the best. Roy  Edited by RoyMacdonald - 14 August 2023 at 8:33pm |
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RoyMacdonald
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Joined: 09 March 2007 Location: Rye East Sussex Status: Offline Points: 981 |
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Posted: 17 August 2023 at 11:15am |
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While working on the foam blocks and looking at the construction I developed a theory that the swinging arm can crack the chain like a whip in top gear (while going over a bump) when everything is at it's loosest and the shock wave travels around the gear through the durralier and up the return tube shooting out of the return tube and getting caught by the pedal as it comes around and as the pedal continues it's rotation it pulls the chain off the chainring leaving you wondering how it got wrapped around the pedal and off the chainring. Anyone got any thoughts on this theory?
All the best. Roy  < id="BFI_" style="width: 1px; height: 1px; display: none;"> |
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zoxed
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Joined: 28 September 2009 Location: Germany Status: Offline Points: 58 |
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Posted: 18 August 2023 at 11:54am |
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Using a normal chain ring the chain was often coming off, but TA 1x ring fixed it https://specialites-ta.com/mono/27-83-mono-mono-plateau-specialites-ta-one-110-shimano-sram-specialites-ta-pl58110339.html#/25,denture,44-dts |
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atlas_shrugged
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Posted: 18 August 2023 at 12:00pm |
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Translation of the TA chainring website details suggests the fine/wide tooth is what stops the chain from coming off: "ONE" concept, fine tooth, wide tooth allowing perfect chain retention without anti-derailment, even in extreme conditions My guess is that the wide tooth keeps the chain centrally located and in the event of possible derailment the next fine tooth is still able to keep the chain located on the chainring. Edited by atlas_shrugged - 18 August 2023 at 12:04pm |
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RoyMacdonald
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Posted: 18 August 2023 at 12:07pm |
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That explains Daniel Fenn's latest chainring design except his is designed to work with 12 speed unlike the French one.
All the best. Roy  Edited by RoyMacdonald - 18 August 2023 at 12:22pm |
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RoyMacdonald
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Posted: 26 August 2023 at 5:38pm |
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Here is Daniel Fenn's latest chainring.  All the best. Roy < id="BFI_" style="width: 1px; height: 1px; display: none;"> Edited by RoyMacdonald - 26 August 2023 at 5:41pm |
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RoyMacdonald
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Posted: 26 August 2023 at 6:21pm |
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Here is a photo of the foam blocks I put in. There is also a small foam block on the swinging arm close to the chain on the return side but I did not bother to photograph it as I was mounting a Loud Mini bike horn at the same time.
 All the best Roy Edited by RoyMacdonald - 26 August 2023 at 6:22pm |
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atlas_shrugged wrote: