XTR M980 38/26: new chain rings and 38/24 combo

[Hawg]

My crank set is the 2 ring "trail" version with 38/26 rings.

Are there any other chain ring companies out there who make a set to fit this crank set? If so, please provide a link.

Also how is the shifting if I drop from a 26 tooth small ring to a 24 tooth small ring with a 38 tooth big ring?

Last, I assume I should replace the mounting bolts and nuts every time when new chain rings are installed?

Thanks!

[AlexRandall]

I've not checked, but Blackspire often does shimano specific rings where no-one else does.

Bolts and nuts are all reusable.
You might have a slight bit of hesitation by comparison to the 2T smaller jump, but shimano FD's shift well enough to make this not an issue.

[PAULUNM]

My crank set is the 2 ring "trail" version with 38/26 rings.

Are there any other chain ring companies out there who make a set to fit this crank set? If so, please provide a link.

Also how is the shifting if I drop from a 26 tooth small ring to a 24 tooth small ring with a 38 tooth big ring?

Last, I assume I should replace the mounting bolts and nuts every time when new chain rings are installed?

Thanks!

I've been on the fence about going with the 980 38x26, coming from a 3x9 970 setup.

Is climbing with your 2x10 painful?

[Leech73]

Here you go: Blackspire - SuperPro M980X Chainrings | Blackspire
which says the gap between 38 and 24 is too large..max 12 tooth diff.

[Ted]

I am running an XT M785 crank at 38 and 22. It works fine with a shadow XT M780 rear der.

[bikecore]

There is a new fc-m785 with 38-24. The 38er has a special design for better shifting

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[Leech73]

The OP has a FC-M980, I doubt he is willing to change it...

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[bikecore]

OP???

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[Rick Draper]

...

[Leech73]

OP???

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Original poster

[dan0]

th 980 uses standard 4 hole size rings 64, 104 so just about any 4 hole 64mm granny will work. if you want langevity action tec has Ti .
the key will be if the deraillier will work. you need something that will lift a 14tooth diference., check your front deraillier specs, it will list what it is capable of.
if its less that 14t then you will either have to get a 24t granny or a 36t big ring

edit
just checked shimanos web site
985, 985E not E2, 986, 986D, 980, 981 all will work, says the 980 series will throw an 18t diference

[jochribs]

I wish Shimano would make a 28t inner ring for the 980. I feel the 26 in my case could be a bit higher. I'll probably just get another brand 28, but it would be nice if Shimano made one in the same forging as the 26.

[Hawg]

I'm running an M985E2 up front so I guess that seals the deal for me. Gonna stick with 38/26. It's been fine for me anyway. Just that occasional +15% grade grind that hurts. But I'll live.

Thanks for all your input guys!

[menusk]

The m970 chain rings should fit because I'm running m980 chainrings on m970 crank it's a direct swap. I use it at as a double with a bash ring. But with that gearing I bought a large 39t rear cassette cog from action tec but I rarely use it It's just insurance for the extra long climb

[dan0]

I wish Shimano would make a 28t inner ring for the 980. I feel the 26 in my case could be a bit higher. I'll probably just get another brand 28, but it would be nice if Shimano made one in the same forging as the 26.

.
the granny doesnt have any ramps or pins so any brand with a 4 hole 64 bhd will work, if you use it alot I would go with actiontec Ti
Action Tec Home Page

[semmiho]

I have a stock FC-M980 with 3 chainrings (24-32-42) and I would like to convert it to 2 chainrings setup for my 29er. I will use chainrings 24 and 36.
My only quesiton would be that, should I buy the XTR Gear Fixing Bolts (M8 x 10.65) & Nuts (4 sets) (code: Y1LR98120), or will it work perfectly with normal aftermarget M8x6.5mm bolts and nuts?

XTR version:

[semmiho]

I still haven't found the answer but found a cheap alternative to Shimano (** KCNC), maybe it can be useful for those people who are thinking on the same question like me.


A possible source (Germany): Bike24 - KCNC Chainring Conversion Kit 3-speed to 2-speed for XTR 980