Is this an inner or outer chainring?

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horizon
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Re: Is this an inner or outer chainring?

Post by horizon »

UpWrong wrote: 21 Apr 2021, 7:07pm
gregoryoftours wrote: 21 Apr 2021, 6:52pm Outer. An inner isn't ramped and pinned unless it's the middle of a triple, and the seating for the head of the chainring bolt is also on the outer side of the chainring. The threaded holes are to screw a peg into depending on your crank spider configuration, to prevent the chain from jamming in between the outer chainring and the crank arm.
Thanks. That's what I thought. I bought it from Spa as the middle in a super compact double, so a triple with a chain guard as the outer. Looks like they sent me an outer ring by mistake
I bought mine second-hand but unused (so basically new). But it came to me assembled (and obviously seems to be correct!). Was this something you were putting together yourself or was it assembled already with the wrong ring?
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UpWrong
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Re: Is this an inner or outer chainring?

Post by UpWrong »

Spa have confirmed they sent the wrong ring by mistake, so I shall be returning it.

I still need to sort out the shims/spacers so the gap between inner and middle ring is correct (and between middle and chaninguard to be safe). I am converting a TD-2 triple I have but I've lost a couple of the spacers, which I think are 0.45mm ones so it would be good if I could get them to add a pack when the corrrect ring is sent.
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Mick F
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Re: Is this an inner or outer chainring?

Post by Mick F »

Middle ring on my Moulton is a 48t.
61/48/35 triple. Originally came with 58/48/34.

.............. so 48t middles do exist.
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markjohnobrien
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Re: Is this an inner or outer chainring?

Post by markjohnobrien »

Mick F wrote: 22 Apr 2021, 5:05pm Middle ring on my Moulton is a 48t.
61/48/35 triple. Originally came with 58/48/34.

.............. so 48t middles do exist.
True: but I was thinking in terms of MTB triples for touring bikes.
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Mick F
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Re: Is this an inner or outer chainring?

Post by Mick F »

Correct of course.

I've only scanned through this thread, and one comment was that 48t wouldn't be a middle ......... or words like that? ........... but they do exist as a middle, coz I've got one.
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UpWrong
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Re: Is this an inner or outer chainring?

Post by UpWrong »

Mick F wrote: 22 Apr 2021, 7:41pm Correct of course.

I've only scanned through this thread, and one comment was that 48t wouldn't be a middle ......... or words like that? ........... but they do exist as a middle, coz I've got one.
But that is probably with a BCD of 130 or 135, not 110.
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Mick F
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Re: Is this an inner or outer chainring?

Post by Mick F »

It's 110mm BCD, same as the inner.
Outer is 130mm.

34/48/58 originally.
This photo is as it is now with the 61t outer.
Triple Chainset.jpeg
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tatanab
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Re: Is this an inner or outer chainring?

Post by tatanab »

To be fair Mick F, that is a special case. However, it is true that both TA and Spa market 46T middle rings in a conventional 110 format..
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Mick F
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Re: Is this an inner or outer chainring?

Post by Mick F »

Yep. :D
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Re: Is this an inner or outer chainring?

Post by UpWrong »

The correct 46T inner/middle ring has arriived from Spa along with a set of 0.45mm spacers which I shall use when I install it.
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