Any compatibility problems with running 8 speed chain on 9 speedchainset?

[Zog The Undeniable]

The SRAM PC58 chain on my tourer makes a faint tinkle in the middle ring
of my Shimano 105 triple chainset. The other two rings are OK. Looking
at it closely, the chain seems to just touch the pick-up teeth on the
inside of the ring. Is this normal and, if not, have Shimano engineered
it so that only 9 speed chains work?

The rear cassette is 8-speed, by the way. I could do a 9 speed
conversion but it would cost about 100UKP in chain, shifters and
cassette and IME 9 speed is rather fussy, which is not what I want on my
main bike. I'd rather buy a plain middle ring.

 

[Qui si parla Campagnolo]

Zog The Undeniable wrote:
> The SRAM PC58 chain on my tourer makes a faint tinkle in the middle
ring
> of my Shimano 105 triple chainset. The other two rings are OK.
Looking
> at it closely, the chain seems to just touch the pick-up teeth on the

> inside of the ring. Is this normal and, if not, have Shimano
engineered
> it so that only 9 speed chains work?
>
> The rear cassette is 8-speed, by the way. I could do a 9 speed
> conversion but it would cost about 100UKP in chain, shifters and
> cassette and IME 9 speed is rather fussy, which is not what I want on
my
> main bike. I'd rather buy a plain middle ring.

Let it tinkle. Use a 8s chain on a 8s cogset, not a 9s, which is of
course, thinner, and won't shift as well.

 

[Pete Biggs]

Zog The Undeniable wrote:
> The SRAM PC58 chain on my tourer makes a faint tinkle in the middle
> ring of my Shimano 105 triple chainset. The other two rings are OK.
> Looking at it closely, the chain seems to just touch the pick-up
> teeth on the inside of the ring. Is this normal and, if not, have
> Shimano engineered it so that only 9 speed chains work?

It'll be optimised for 9-speed. You'd probably only get the tinkle with
certain chainlines and certain models/sizes of rings, though.

> The rear cassette is 8-speed, by the way. I could do a 9 speed
> conversion but it would cost about 100UKP in chain, shifters and
> cassette and IME 9 speed is rather fussy, which is not what I want on
> my main bike. I'd rather buy a plain middle ring.

Chainring spacers would be a bit cheaper.

~PB

 

[Zog The Undeniable]

Pete Biggs wrote:

> Chainring spacers would be a bit cheaper.

I think it's the pick-up teeth on the same ring that are causing the
sound - the chain is nowhere near the other two rings.

 

[Werehatrack]

On Sun, 15 May 2005 09:21:04 +0100, Zog The Undeniable
<[email protected]> wrote:

>The SRAM PC58 chain on my tourer makes a faint tinkle in the middle ring
>of my Shimano 105 triple chainset. The other two rings are OK. Looking
>at it closely, the chain seems to just touch the pick-up teeth on the
>inside of the ring. Is this normal and, if not, have Shimano engineered
>it so that only 9 speed chains work?

I've got a set of nominal 9s front sprockets on a 3x8 setup here, and
have neither noise nor problems. You may be right about what's
causing the noise, but I simply woudn't worry about it as long as the
chain doesn't skip and the shifting is OK otherwise...though it seems
odd that *any* chain would be able to contact those teeth except
during shifting.

>The rear cassette is 8-speed, by the way. I could do a 9 speed
>conversion but it would cost about 100UKP in chain, shifters and
>cassette and IME 9 speed is rather fussy, which is not what I want on my
>main bike. I'd rather buy a plain middle ring.

Your choice, then; ignore the noise or swap the ring, but I'd go the
former route if it was me.
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