Acera v Deore Triple

[pwu]

I have M391, M391-8, M430-8 and M590 and the rings are interchangeable. The middle rings are identical deore quality. Inner rings on square taper and octalink have a little plastic removable guard to prevent the chain getting stuck in the bottom bracket.

Here are some weights of rings:

22t = 43g
32t = 59g (Never used but heard its weak)
44t = 185g
26t = 63g
36t = 97g
48t steel = 234g
48t alu = 98g

[Sweep]

These are "MTB" chainsets.
If you are using "MTB" changers, F. mech. and chainline, everything should work straight "out of the box".
However, if you want to use road STIs (with an indexed front shift) then you will need a road F. mech. and probably a shorter BB axle in order to get (close to) road chainline.

Sorry colin, should have said. Will be put onto a 90s quality steel hybrid frame to become a lightish tourer. 9 speed. Flat bar mtb controls, old mtb front mech.
Getting the idea that it is near as dammit as good as the deore 510 for my purposes but just a bit heavier. Feel free to contradict me.

[Sweep]

I have M391, M391-8, M430-8 and M590 and the rings are interchangeable. The middle rings are identical deore quality. Inner rings on square taper and octalink have a little plastic removable guard to prevent the chain getting stuck in the bottom bracket.

Thank you pwu - this is useful info.

Very - as a quick search hasn't turned up too many 391 spares - though the 22T seems easier to find.

er, edit - are you sure?

Or is chiselling involved?

For found this:

https://www.rosebikes.co.uk/shimano-deo ... _size=22+t.

For the 590. At the bottom it has an extensive list of what it is compatible with but doesn't mention the 391.

[pwu]

I have M391, M391-8, M430-8 and M590 and the rings are interchangeable. The middle rings are identical deore quality. Inner rings on square taper and octalink have a little plastic removable guard to prevent the chain getting stuck in the bottom bracket.

Thank you pwu - this is useful info.

Very - as a quick search hasn't turned up too many 391 spares - though the 22T seems easier to find.

er, edit - are you sure?

Or is chiselling involved?

For found this:

https://www.rosebikes.co.uk/shimano-deo ... _size=22+t.

For the 590. At the bottom it has an extensive list of what it is compatible with but doesn't mention the 391.

Yes I physically tried it, the shoulders of the right crank that the rings sit on are compatible. The spec sheets are usually limited to the year of print, M530 chainrings should also fit.

Have you concidered this? https://bike.shimano.com/en-EU/product/ ... 300-3.html

[Sweep]

Yes I physically tried it, the shoulders of the right crank that the rings sit on are compatible. The spec sheets are usually limited to the year of print, M530 chainrings should also fit.

Have you concidered this? https://bike.shimano.com/en-EU/product/ ... 300-3.html

Thanks - will bear that in mind.

On the fraught question of bits compatibility/matching, if Shimano techdocs are somewhat compromised as you say, is SJS the best source of info?

Re that last suggestion, thanks, but that's external bearings isn't it?

And have decided to get all my bikes onto square taper if possible.

Could live with Octalink if chainrings match some of my other bikes.

[pwu]

Yes I physically tried it, the shoulders of the right crank that the rings sit on are compatible. The spec sheets are usually limited to the year of print, M530 chainrings should also fit.

Have you concidered this? https://bike.shimano.com/en-EU/product/ ... 300-3.html

Thanks - will bear that in mind.

On the fraught question of bits compatibility/matching, if Shimano techdocs are somewhat compromised as you say, is SJS the best source of info?

Re that last suggestion, thanks, but that's external bearings isn't it?

And have decided to get all my bikes onto square taper if possible.

Could live with Octalink if chainrings match some of my other bikes.

SJS is probably a better source.

Square taper can result in chainring wobble so when chainreaction were selling the M430-8 for £11 I bought one and a ES300 bottom bracket (reused the 48/36/26 M391 rings, didn't use the 44/32/22 it came with) and it was smoother and stiffer with no wobble. I liked octalink. I saw the M590 for £39 with 10% off code and top cashback it was £35 and quality 9 speed stuff is disappearing so I bought it.

If you pry off the 'do not disassemble' caps and fill the bearings with grease (they come with hardly any grease from the factory, I used TF2 red grease) they should be fine. I used a topeak beam style torque wrench to tighten the preload cap to just under 1nm and the bolts to 12nm it spins about 5 revolutions by hand unlike some videos on youtube where people overtightened the preload cap which kills the ungreased bearings.

https://photos.app.goo.gl/UqWuEAV84RScFnQi7
https://photos.app.goo.gl/5W1nPgzJuxirPMCY8

Here are some pictures of the m430 rings on the M590
https://photos.app.goo.gl/ZRkFHr3yJYVPY9iE6
https://photos.app.goo.gl/kgtKA6MSzUeYoenp8

[elPedro666]

Just to clarify (cuz it took me a minute!) m590 is Hollowtec II, not Octolink. Nothing wrong with what you said, just that you switched from one system to t'other mid-paragraph and it took me a moment to catch up [emoji6]

Definitely agree that those 'Do not disassemble' caps are ripe for disassembling! [emoji23][emoji106]

I'm a trendy consumer. Just look at my CLT-L09 using hovercraft full of eels.

[elPedro666]

I like Octolink too, for what it's worth, just beware there's two versions.

I'm a trendy consumer. Just look at my CLT-L09 using hovercraft full of eels.