Do I need Loctite for chainring bolts?

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newfhouse

Resolutely on topic
What would @silva do?
 

Big John

Guru
I overheard a market trader talking to a punter who was after some loctite. He told him he didn't stock it but that a drop of gloss paint on the thread works just as well. I've never tried it (I have an old tube of loctite I've had for years) but it sounds plausible to me.
 
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Ajax Bay

Guru
Location
East Devon
There are not many places where I use threadlocker:
Bottom bracket threads (if pre-applied in box), chainring bolts, stem bolts, mudguard stay bolts (fastening to drop-outs and into chainstay bridge, not the guard ends), bottle cage bolts, rim brake insert pad securing screws.
 

Mr Celine

Discordian
I've lost bolts from the inner ring of a triple on more than one occasion.
On my winter bike once I was relieved for a few seconds when an annoying rattle suddenly stopped, only to realise seconds later that the rattling component was the second last of the five inner ring bolts, and it had stopped rattling because it had fallen off!
An unseasonably warm spell in March this year led to me reassembling the summer bike from its winter strip-down in a bit of a hurry. I couldn't find my bottle of loctite and then forgot all about it.
A few weeks later while out on a ride the bike seemed very draggy. Brakes were fine, wheels were spinning fine, then I saw the frame around the drive side bottom bracket covered in grey powder. One of the inner chainring bolts was loose and protruding and with every rotation was gouging more resin off the frame. Fortunately it never got as far as any actual carbon fibres. Even after cleaning and coating with lacquer it still looked a right mess.
607396


The inner ring bolts on a triple screw directly into the alloy of the crank spider. It's all too easy to strip the threads, hence the use of loctite.
 

rogerzilla

Legendary Member
You don't need it. But you do need decent bolts that can be done up tight. A bit of grease helps stop the back nut spinning but the real secret is to buy ones that work. Stronglight are good.

If you ride a fixie, you know the importance of tight chainring bolts.
 

mrandmrspoves

Middle aged bald git.
Location
Narfuk
If you buy replacement chain ring bolts you will often find that they already have blue threadlock applied - which suggests that the manufacturers recommend it.
 

silva

Über Member
Location
Belgium
What would @silva do?
I use a brown grease specified for aircraft doors etc, that I bought cheap at €3 for a canister of 1 kilo, in a metalware store.
I tension the bolts, subsequent days I check and tension again if needed, and usually, after that no further attention needed.
Since my chainring is now bolted with default metric bolts and nuts, there isn't any risk of damaging thread anymore, so I just tension as hard as I can with standard length key 17.
I never used threadlock.
The dealer of my current bike did (the red loctite), for the bolt on cog on the IS disc mount. The bolts were way too short, about halve of what the specs of the hub flange recommended. The longer replacement bolts didn't turn in well, after trying 1 I decided to not take the risk, and instead first tap out the 6 flange holes. That worked, and didn't cause further problems, now being 4 years ago.

The benefit of a thread locker appears to me as making sure the mount is fixed directly, post-leaving the shop, as to not require customers to check the bolts in subsequent days.
In my case, that isn't a problem, since I have the tools and do it myself.
 
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