what are these called and where to get them?

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tommydog
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Joined: 11 Feb 2017, 6:48pm

what are these called and where to get them?

Post by tommydog »

Does anyone know what these fastenings are called which hold the chain wheel on and where to order them from? Ideally I would like them in stainless.

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squeaker
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Joined: 12 Jan 2007, 11:43pm
Location: Sussex

Re: what are these called and where to get them?

Post by squeaker »

"42"
tommydog
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Re: what are these called and where to get them?

Post by tommydog »

squeaker wrote:Chainring bolts
HTH



Thanks for the link. Are they all a standard size as I don't see any size information on the webpage?
mig
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Re: what are these called and where to get them?

Post by mig »

they are of different lengths to accomodate single or multiple chainrings.

that pic is of a single chainring set up.
whoof
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Joined: 29 Apr 2014, 2:13pm

Re: what are these called and where to get them?

Post by whoof »

tommydog wrote:
squeaker wrote:Chainring bolts
HTH



Thanks for the link. Are they all a standard size as I don't see any size information on the webpage?


No they are not all the same.
There are inner and outer for double or the two largest rings on a triple.

https://www.sjscycles.co.uk/chainsets/b ... -set-of-5/

Inner only for the smallest ring on a triple

https://www.sjscycles.co.uk/chainsets/t ... pack-of-5/

Inner and outer for a single chainring.

https://www.sjscycles.co.uk/chainsets/s ... pack-of-5/
the_twin
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Re: what are these called and where to get them?

Post by the_twin »

You might want to get the little tool that goes into the slots on the back to stop the whole thing spinning as you tighten it up with a Allen key from the other side. If these bolts are loose you will be driven demented by creaking sounds as you pedal.
Brucey
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Re: what are these called and where to get them?

Post by Brucey »

the_twin wrote:You might want to get the little tool that goes into the slots on the back to stop the whole thing spinning as you tighten it up with a Allen key from the other side. If these bolts are loose you will be driven demented by creaking sounds as you pedal.


Absolutely not necessary if you make sure

a) that the threads are not dirty or otherwise obstructed (eg by running the two halves in and out of one another before installation) and

b) using grease on the screw threads only of both parts of the bolt. The rest of the assembly should be assembled bone-dry.

For its diameter the thread has an unusually fine pitch; this (if greased and unobstructed) allows it to be fully tightened without having to grip the sleeve part of the bolt at all.

Such bolts are available in stainless steel, but you need a length that is correct for your parts, and they can vary a bit, e.g. so all 'double length' bolts are not the same.

e.g. https://www.sjscycles.co.uk/chainsets/id-stainless-steel-chainring-bolts-m8-x-075-double-85-mm-nuts-pack-of-5/

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
mercalia
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Location: london South

Re: what are these called and where to get them?

Post by mercalia »

the_twin wrote:You might want to get the little tool that goes into the slots on the back to stop the whole thing spinning as you tighten it up with a Allen key from the other side. If these bolts are loose you will be driven demented by creaking sounds as you pedal.


yes i had that, so grease them when you install them
the_twin
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Joined: 11 Mar 2018, 9:01pm

Re: what are these called and where to get them?

Post by the_twin »

The doofus is only £3. Also handy when whoever put them in wasn’t so clever with the grease.
Brucey
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Joined: 4 Jan 2012, 6:25pm

Re: what are these called and where to get them?

Post by Brucey »

the_twin wrote:The doofus is only £3. Also handy when whoever put them in wasn’t so clever with the grease.

GPWM, although normally 'doofus' is someone and 'doofer' is something.

If they are 'very well in' through prior (in)-action I usually find I need to remove the crankset and use a specially made tool that fit in the bench vice, and heat etc to remove the bolts.

Most of the tools that you can buy cheaply are apparently of help when tightening but are sadly no match for a well seized bolt; I do not recommend that you buy such a thing for assembling these bolts; arguably all it does is encourage you to assemble the bolts without the necessary checking for binding and lubrication, and causes trouble down the line.

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
tommydog
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Re: what are these called and where to get them?

Post by tommydog »

the_twin wrote:You might want to get the little tool that goes into the slots on the back to stop the whole thing spinning as you tighten it up with a Allen key from the other side. If these bolts are loose you will be driven demented by creaking sounds as you pedal.


Do you mean this:

https://www.sjscycles.co.uk/tools/park- ... ut-wrench/


The tool may be useful as it was very difficult to remove these. I had to resort to tapping it round with a hammer / screwdriver.
tommydog
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Re: what are these called and where to get them?

Post by tommydog »

Brucey wrote:
the_twin wrote:
Such bolts are available in stainless steel, but you need a length that is correct for your parts, and they can vary a bit, e.g. so all 'double length' bolts are not the same.

e.g. https://www.sjscycles.co.uk/chainsets/id-stainless-steel-chainring-bolts-m8-x-075-double-85-mm-nuts-pack-of-5/

cheers


But I only have one chainring. So I guess it's these if I want stainless:

https://www.sjscycles.co.uk/chainsets/i ... pack-of-5/

can't see any other sizes for single chainring
the_twin
Posts: 70
Joined: 11 Mar 2018, 9:01pm

Re: what are these called and where to get them?

Post by the_twin »

tommydog wrote:
the_twin wrote:You might want to get the little tool that goes into the slots on the back to stop the whole thing spinning as you tighten it up with a Allen key from the other side. If these bolts are loose you will be driven demented by creaking sounds as you pedal.


Do you mean this:

https://www.sjscycles.co.uk/tools/park- ... ut-wrench/


The tool may be useful as it was very difficult to remove these. I had to resort to tapping it round with a hammer / screwdriver.


That's the sort of thing, yes.
Brucey
Posts: 44521
Joined: 4 Jan 2012, 6:25pm

Re: what are these called and where to get them?

Post by Brucey »

tommydog wrote: I only have one chainring. So I guess it's these if I want stainless:

https://www.sjscycles.co.uk/chainsets/i ... pack-of-5/

can't see any other sizes for single chainring


I guess so. They can always be made shorter if needs be.

BTW if you have but one chainring, it may be possible to fit a chainguard, if that is the sort of thing you might fund useful. Now is the time to think about it, anyway.

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
tommydog
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Joined: 11 Feb 2017, 6:48pm

Re: what are these called and where to get them?

Post by tommydog »

Brucey wrote:
BTW if you have but one chainring, it may be possible to fit a chainguard, if that is the sort of thing you might fund useful. Now is the time to think about it, anyway.

cheers



come to think of it, I was just considering that! Never had a bike with a chain guard before, but think it may be useful. Do you have a preference? I have so far looked at the Hebie Chainglider and the SKS Chainboard for my Rohloff equipped bike. But on the other hand I don't see many touring bikes with chainguards, so wonder why? On paper they seem to make a lot of sense.
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