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lost TWO chainring bolts somewhere
 vkan member not displaying online status
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Lynskey Cooper
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posted 3/30/2017
at 9:42:41 AM
viewed 947 times
This is a new one on me--I was JRA, stopped at a stop light in the inner ring up front. Light goes green, I head into the intersection and my chain dumps to the inside.

OK, I've had that happen before, some front derailleur action gets it back on and I keep riding.

Same thing happens at the next light. What the heck?!

OK, the inside stop screw is probably too far inward, so I adjust that and I can change to the inner ring without the chain falling off.

Back to the stop light---green, I go, instant derail under load.

Stop in the median and look...TWO chainring bolts are gone!

Wow. That is something I have never seen nor heard/read about before (that I could recall anyway). And of course, I don't have a spare let alone two in my on-bike kit.

So I had to call my wife to come pick me up during her break.

Has this happened to anybody else? I happen to have a spare set of chainring bolts at home so I'll replace them all just in case, and keep the other three as spares in my on-bike tool kit.

I should have checked last week when I was having some shifting issues and found my front derailleur misaligned, though the two issues may have been related somehow.

Hopefully my chainrings and spider aren't bent too badly .

UPDATE: the outer ring and spider seem to be fine, but the inner ring was a little bent. I tried straightening it out, but gave up. Fortunately, I also happen to have a spare 10-speed 110mm BCD 34 tooth ring to swap into it. Yet another mismatching color though--original was grey, the replacement is silver.

thread edited on 3/30/2017 at 11:59:08 AM

 ericrrrm member not displaying online status
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posted 3/30/2017
at 10:16:34 AM
post #1 viewed 943 times
Were the two missing bolts next to each other? If so, I wonder if you could have gotten away with moving one of the remaining bolts so they weren't.

This has never happened to me, but you're making me think I should carry a spare.
post edited on 3/30/2017 at 10:17:22 AM

 Bikeman630 member online
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posted 3/30/2017
at 10:48:44 AM
post #2 viewed 939 times
Were the two missing bolts next to each other? If so, I wonder if you could have gotten away with moving one of the remaining bolts so they weren't.

This has never happened to me, but you're making me think I should carry a spare.
-- posted by ericrrrm
To prevent this from happening again try putting a drop of LockTight on the threads of the screws before replacing/tightening them to hopefully preventing them from coming loose again.
Be safe.

 vkan member not displaying online status
Lifetime: 50,179 mi
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Lynskey Cooper
Road bike
'BentRider Recumbent Club
posted 3/30/2017
at 11:50:51 AM
post #3 viewed 932 times
Were the two missing bolts next to each other? If so, I wonder if you could have gotten away with moving one of the remaining bolts so they weren't.

This has never happened to me, but you're making me think I should carry a spare.
-- posted by ericrrrm


Yep, they were. Good thought--it didn't occur to me to try spreading the existing bolts around. I might have eventually thought of that if I weren't just a couple of miles from home at the time, but I'll squirrel your advice away in the old attic for future on-road disasters. Thanks!

The type of chainring bolt I have is the two-allen-key variety, so that's an argument for carrying a set of plain old L-shaped allen keys rather than just a Y-wrench. I actually carry a set of keys (in the saddle bag) AND a set of Fix-It-Sticks (in the tool roll).

However, it turns out that the replacements I have aren't the two-allen-key type, they're the old type that use a chainring bolt tool (L-shaped gizmo that's like a very wide flat tip driver with a gap in the middle). And of course, that tool wasn't in my bike tool box , so I had to make due without it.

Sadly, one of the new set's head snapped off even as I was using a torque wrench to get them up to spec. So I put one of the old ones in its place, leaving me with four silver ones and one black (the original).



 vkan member not displaying online status
Lifetime: 50,179 mi
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Home: Morrisville, NC 
Lynskey Cooper
Road bike
'BentRider Recumbent Club
posted 3/30/2017
at 11:55:40 AM
post #4 viewed 931 times
Were the two missing bolts next to each other? If so, I wonder if you could have gotten away with moving one of the remaining bolts so they weren't.

This has never happened to me, but you're making me think I should carry a spare.
-- posted by ericrrrm
To prevent this from happening again try putting a drop of LockTight on the threads of the screws before replacing/tightening them to hopefully preventing them from coming loose again.
Be safe.
-- posted by Bikeman630


When I removed the remaining old ones, there was some greenish-blue stuff on the threads already. I assume that was the factory thread lock.

Perhaps it was simply the sheer (literally! amount of massive torque I put out riding the local hills in the 34-28 gear that just snapped the heads off and they just fell out at some point.

 tojesky member offline
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posted 3/30/2017
at 6:12:42 PM
post #5 viewed 917 times
Were the two missing bolts next to each other? If so, I wonder if you could have gotten away with moving one of the remaining bolts so they weren't.

This has never happened to me, but you're making me think I should carry a spare.
-- posted by ericrrrm
To prevent this from happening again try putting a drop of LockTight on the threads of the screws before replacing/tightening them to hopefully preventing them from coming loose again.
Be safe.
-- posted by Bikeman630
And if you ever want to remove the bolts, use the removable type of threadlock.

 Kapn_Kaos member not displaying online status
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Clydesdales
posted 4/3/2017
at 5:39:15 AM
post #6 viewed 883 times
Blue is light duty whilst red is more permanent.

 Kapn_Kaos member not displaying online status
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Raleigh 3 Spd Sport
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Clydesdales
posted 4/3/2017
at 5:39:30 AM
post #7 viewed 882 times
Blue is light duty whilst red is more permanent.

 vkan member not displaying online status
Lifetime: 50,179 mi
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Home: Morrisville, NC 
Lynskey Cooper
Road bike
'BentRider Recumbent Club
posted 4/3/2017
at 5:48:27 AM
post #8 viewed 880 times
It may well not be a coincidence that the remaining ones had thread lock on them--perhaps the lost ones didn't?

BTW, this is a SRAM Rival OCT crank, purchased in retail packaging.

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posted 4/3/2017
at 7:03:57 AM
post #9 viewed 876 times
It may well not be a coincidence that the remaining ones had thread lock on them--perhaps the lost ones didn't?

BTW, this is a SRAM Rival OCT crank, purchased in retail packaging.

-- posted by vkan


Maybe your crank was built either on Monday or Friday. Monday they were suffering from a hangover. Friday they were in a hurry to leave to have a fun weekend.

Zman
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