Spoke broken by chain - autopsy and plan of action
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- Posts: 178
- Joined: 31 Aug 2020, 8:49pm
Spoke broken by chain - autopsy and plan of action
Less than a month ago I invested in a new Shimano wheel (see link), and had been over the moon with it until last night when true to form my luck ran out and my chain, shifting from 2nd to 1st gear, jumped right over the largest ring and into the spokes. As I just about manage to release it from behind the cassette, I realise that in jamming itself there it had caused a spoke to snap at the hub.
https://www.amazon.co.uk/gp/product/B07 ... UTF8&psc=1
On a more positive note, this happens the night before my 30 day guarantee expires, and Amazon are sending me a replacement. But it could be up to a month before that arrives, so what are my options in the meantime?
Should it be safe enough to get by if I just remove the broken spoke and crack on?
Instead of buying a packet of replacement spokes, I still have my old wheel, is it a done thing at all to remove spokes from an old wheel to be used as replacements, short term or otherwise?
Also, going forward, do I need to review the indexing of my gears? Generally speaking they have been working like a dream this last month in every way, there has only been a few occasions where this has happened. The chain sort of goes flying into the spokes - not from the largest cog - but from 2nd and maybe 3rd, mainly when I'm climbing the gears quite rapidly and maybe putting too much force into the pedals?
https://www.amazon.co.uk/gp/product/B07 ... UTF8&psc=1
On a more positive note, this happens the night before my 30 day guarantee expires, and Amazon are sending me a replacement. But it could be up to a month before that arrives, so what are my options in the meantime?
Should it be safe enough to get by if I just remove the broken spoke and crack on?
Instead of buying a packet of replacement spokes, I still have my old wheel, is it a done thing at all to remove spokes from an old wheel to be used as replacements, short term or otherwise?
Also, going forward, do I need to review the indexing of my gears? Generally speaking they have been working like a dream this last month in every way, there has only been a few occasions where this has happened. The chain sort of goes flying into the spokes - not from the largest cog - but from 2nd and maybe 3rd, mainly when I'm climbing the gears quite rapidly and maybe putting too much force into the pedals?
Re: Spoke broken by chain - autopsy and plan of action
Sounds like your gears just aren't set up right, otherwise the low limit screw would stop this happening regardless of how far off your indexing is.
I'm surprised Amazon are sending a replacement, given that your gear setup is likely what caused the damage rather than the wheel itself.
I have no idea on spoke etiquette. I'm the happy owner of a dork disc (which saved me from a similar fate after I bent the mech hangar in an earlier fall).
I'm surprised Amazon are sending a replacement, given that your gear setup is likely what caused the damage rather than the wheel itself.
I have no idea on spoke etiquette. I'm the happy owner of a dork disc (which saved me from a similar fate after I bent the mech hangar in an earlier fall).
Re: Spoke broken by chain - autopsy and plan of action
Yes. You should turn clockwise the "L" limit screw (low) on the mech so that the chain does not overshoot the largest cog. It is best to err on the side of caution and adjust it so that the chain will only just shift to the largest cog. Turn it clockwise a 1/4 turn at a time until it won't shift from 2nd to 1st. Then turn it counterclockwise a 1/8 of a turn at a time until it shifts properly.doffcocker wrote: ↑27 Sep 2021, 1:19pm
Also, going forward, do I need to review the indexing of my gears? Generally speaking they have been working like a dream this last month in every way, there has only been a few occasions where this has happened. The chain sort of goes flying into the spokes - not from the largest cog - but from 2nd and maybe 3rd, mainly when I'm climbing the gears quite rapidly and maybe putting too much force into the pedals?
Re: Spoke broken by chain - autopsy and plan of action
If the spokes on the old wheel are the same length as the new, give or take a mm or two then it should be ok to reuse one.
Richard M
Cardiff
Cardiff
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- Posts: 178
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Re: Spoke broken by chain - autopsy and plan of action
Obviously I know it's not Amazon's fault, but they are incredibly good when it comes to returns, or at least they are with me, probably because of the ungodly amount of money they have gotten out of me over the years.
Re: Spoke broken by chain - autopsy and plan of action
Essentially, your new wheel has not placed the cassette in exactly the same place as the old.
I should coco.
Re: Spoke broken by chain - autopsy and plan of action
As above: adjust the limit screws.
Jonathan
Jonathan
- tykeboy2003
- Posts: 1277
- Joined: 19 Jul 2010, 2:51pm
- Location: Swadlincote, South Derbyshire
Re: Spoke broken by chain - autopsy and plan of action
Properly set the limit screw as others have said.
Buy a few spare spokes from you LBS and replace the broken spoke. In my experience, it's always the drive-side that loses the occasional spoke probably because of the wheel being slightly dished to accommodate the freewheel/cassette. I wouldn't ride it with a missing spoke for too long as it will increase the likelyhood of losing another one.
Buy a few spare spokes from you LBS and replace the broken spoke. In my experience, it's always the drive-side that loses the occasional spoke probably because of the wheel being slightly dished to accommodate the freewheel/cassette. I wouldn't ride it with a missing spoke for too long as it will increase the likelyhood of losing another one.
- simonineaston
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- Location: ...at a cricket ground
Re: Spoke broken by chain - autopsy and plan of action
The redoubtable Calvin Jones treats us to 15 minutes of excellent advice on adjusting rear mech.s here. Be sure to watch as it's invaluable.
S
(on the look out for Armageddon, on board a Brompton nano & ever-changing Moultons)
(on the look out for Armageddon, on board a Brompton nano & ever-changing Moultons)
Re: Spoke broken by chain - autopsy and plan of action
Dork disc? Is that the plastic disc that sits between cog and spoke? Used to be essential on very early MTBs. Sadly (?) rarely seen nowadays. I do still use a gear guard (bent bit of wire protecting the rear mech), mainly for when bike is in transit.
Re: Spoke broken by chain - autopsy and plan of action
Not the indexing, the L limit screw.
It shouldn't ever happen. Screw the L limit screw in half a turn and see if it still shifts to the biggest sprocket.doffcocker wrote: ↑27 Sep 2021, 1:19pmGenerally speaking they have been working like a dream this last month in every way, there has only been a few occasions where this has happened.
We'll always be together, together on electric bikes.
Re: Spoke broken by chain - autopsy and plan of action
Last night while watching the moto 3 race I noticed some of the 250/300cc motorcycles sporting a solid or covered rear wheel like velodrome bikes.
Don't know if that's for aerodynamics given the lower power available but it looks great. Would stop the chain getting jammed and spitting the pilot off too.
Don't know if that's for aerodynamics given the lower power available but it looks great. Would stop the chain getting jammed and spitting the pilot off too.
I am here. Where are you?
Re: Spoke broken by chain - autopsy and plan of action
Yeah, that. They do still come as standard on many bikes but people usually remove them because they're not deemed "cool", hence the name. In my view it's there for a purpose, as is the bell. Sporting bright yellow lycra, usually, it should be apparent that I don't care what I look like.
Re: Spoke broken by chain - autopsy and plan of action
And makes riding in variable side winds a completely different experience...Cowsham wrote: ↑28 Sep 2021, 7:52am Last night while watching the moto 3 race I noticed some of the 250/300cc motorcycles sporting a solid or covered rear wheel like velodrome bikes.
Don't know if that's for aerodynamics given the lower power available but it looks great. Would stop the chain getting jammed and spitting the pilot off too.
: - )
Jonathan
Re: Spoke broken by chain - autopsy and plan of action
Yeah -- tt windy corner comes to mind -- wonder how that would go?Jdsk wrote: ↑28 Sep 2021, 10:11amAnd makes riding in variable side winds a completely different experience...Cowsham wrote: ↑28 Sep 2021, 7:52am Last night while watching the moto 3 race I noticed some of the 250/300cc motorcycles sporting a solid or covered rear wheel like velodrome bikes.
Don't know if that's for aerodynamics given the lower power available but it looks great. Would stop the chain getting jammed and spitting the pilot off too.
: - )
Jonathan
I am here. Where are you?