105 5800 outer chainring - in two parts?

[SpokeyDokey]

As per thread title - is the 105 5800 chainring in two parts?

I've been tracking down a small clicking noise which occurred yesterday in my rarely used small/small combo.

Not a real issue tbh but I thought that I would check hanger alignment (slightly off and corrected) and the rear mech' high, low, 'B' and cable tension settings - all fine.

I eventually traced the click to when the rotating chain occasionally intersects with the rear protruding section of the rivets on the outer chainring - the back of the little silver dots pictured here just by the chainring teeth (ignore the weight thing - not my picture):

I'd always assumed that the 'ring was one piece so am I right in thinking that it is of two piece construction?

 

[Smokin Joe]

Those pins are to help the chain climb from small to large ring during shifting. Running small/small means the off line chain will catch on either them or the teeth on the chainring, hence the clicking.

 

[Levo-Lon]

I was driven mad with a click from there, i thought.
Turned out to be pedal needed grease ,perfect after that.

Do check pedal play

 

[SpokeyDokey]

Those pins are to help the chain climb from small to large ring during shifting. Running small/small means the off line chain will catch on either them or the teeth on the chainring, hence the clicking.

Ah I see. Thanks very much for the explanation. I feel pretty dumb (albeit enlightened) now!

 

[SpokeyDokey]

I was driven mad with a click from there, i thought.
Turned out to be pedal needed grease ,perfect after that.

Do check pedal play

Thanks, but it's definitely the little pins as per @Smokin Joe 's reply about whose purpose I was ignorant of. [Why haven't we got a dopey smiley?]

 

[SpokeyDokey]

Oh crikey - I've just seen the 'Chainring Pin Thing' thread which would've answered my question - all that virtual ink wasted!

 

[Racing roadkill]

Clicks from the ring bolts are very common. They are in 2 pieces to allow a change of ring / crank, independent of each other.

 

[Ajax Bay]

How can a "ring bolt" be in "2 pieces"?
Anyway, @Smokin Joe has nailed it.

 

[Venod]

How can a "ring bolt" be in "2 pieces"

I don't understand your surprise.

A chainring bolt is in 2 pieces allowing you to change the chainrings, or are you referring to something else ?

 

[Ajax Bay]

Bolt is one piece. the nut is another piece: as in "nut and bolt".

 

[Venod]

Bolt is one piece. the nut is another piece: as in "nut and bolt".

So would you buy these and some extra nuts ?

https://www.sjscycles.co.uk/chainsets/black-middleburn-outer-alloy-single-chainring-bolts-set-of-5/

 

[Ajax Bay]

Nope. The set of bolts and nuts is misdescribed (as "bolts").
I'd buy this bolt set:
https://www.sigmasports.com/item/Rotor/Road-Bolt-Set-5-Bolts-and-5-Nuts/DNKF?

 

[andrew_s]

So would you buy these and some extra nuts ?

https://www.sjscycles.co.uk/chainsets/black-middleburn-outer-alloy-single-chainring-bolts-set-of-5/

Those are fine as they are - no extra nuts required.
Ajax Bay's just being pedantic - I'm surprised he hasn't tried to get us to call them screws

I'd get the ID stainless ones from further down the page, which have the advantage of being cheaper.

 

[si_c]

Also with newer series Shimano chainrings, the bolt threads into the big ring, there is no separate nut.

 

[Venod]

I'm surprised he hasn't tried to get us to call them screws

That would be a more accurate description, as they are fully threaded, a bolt has a plain shank between the thread and the head, a fully threaded one is known as a set screw in the UK.