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Shimano 1X10 conversion

Old 01-28-19, 01:54 PM
  #1  
pataspen
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Shimano 1X10 conversion

Hi all,

I am trying to upgrade my 2010 mountain bike from 2X10 to 1X10 and Iím getting stuck on some compatibility issues. Iíve been searching the internet for answers and havenít yet nailed it down, so I figured Iíd turn to the smart folks on this forum.

Iíd like to go with Shimano because I prefer the push/pull shifting. I will be using the bike for some long bikepacking trips and need durability, so Iíd like to go with XT. Also, because the loaded bike will be heavy and Iím old and weak, I need a big range, so have identified 11-46 for the cassette.

Hereís what I have on the bike and will use in the new setup:

M8000 XT brakes
10 speed hub (thus the reason Iím going 10 speed rather than 11)
SRAM XX crankset (either 28T or 30T)

Hereís what I think I need:

Shadow+ clutch derailleur capable of handling a 46T cog
10 speed shifter
11-46 cassette
chain

Sounds simple, right?

The shifter and derailleur are where I get stuck.

For derailleur, there is the XT M786 10 speed. But according to the Shimano website it canít handle more than a 42 tooth cog. But there are some on the internet who feel it could work. Has anyone tried using the M786 with 11-46 with any luck?

The other option is the newer M8000 11-speed. I think this will work with 10 speed shifting, correct? Also, will it work with the 46t?

For the shifter I run into some problems. The 10 speed XT shifter is the M786, but this is i-spec B and the brake levers are i-spec II. So they wonít mount together on the bars. But I could get the bar clamp style and take up a little more space on the bars.

If I want to use the i-spec mounting system my options are SLX or Deore shifters. Although these are probably good quality, Iím not sure using the i-spec mounting system would be more beneficial than using an XT clamp-on shifter. Thoughts?

So long story short, my questions are:

Will an 11-speed M8000 derailleur work on a 10-speed 11-46 cassette?

How about the older style M786 derailleur?

If I get the 11-speed shifter will I need an 11-speed chain?

Is using the i-spec II mounting system with an M7000 SLX shifter a better option than a clamp-on M786 XT shifter?

Sorry about all the dumb questions, but Iím getting completely confused trying to piece this together. I appreciate any assistance you can provide.

Pat
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Old 01-28-19, 08:13 PM
  #2  
Kapusta
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You might just look into going 11 speed. There are a few 11-46 cassettes that will work on a 10 speed hub (Shimano and Sunrace, for example). Even though the cassette is wider than the cassette carrier on the freehub, they get around that by hanging the largest cog out over the end of the carrier, towards the spokes.

I have a 9/10 speed hub and just bought the following to go 1x11:

Shimano SL-M8000 XT Single Shifters - Right Only, 11 Speed
https://www.universalcycles.com/shop...s.php?id=74270
(not iSpec... my brake levers were not going to play nice)

Shimano RD-M8000 XT Rear Derailleurs - Mid Cage (GS)
https://www.universalcycles.com/shop...s.php?id=74285
(will handle a 46t cog on a 1x setup)

SunRace CSMX8 11sp Cassette - 11-46t, Silver (11,13,15,18,21,24,28,32,36,40,46)
https://www.universalcycles.com/shop...s.php?id=76309
(I like the cog tooth counts better than on the Shimano)

I still need to pick up an 11 speed chain.

Good luck.
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Old 01-29-19, 05:42 AM
  #3  
dsaul
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All Shimano 11 speed MTB cassettes will fit on 10 speed hubs.
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Old 01-29-19, 07:50 PM
  #4  
pataspen
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Originally Posted by Kapusta View Post
You might just look into going 11 speed. There are a few 11-46 cassettes that will work on a 10 speed hub (Shimano and Sunrace, for example). Even though the cassette is wider than the cassette carrier on the freehub, they get around that by hanging the largest cog out over the end of the carrier, towards the spokes.
Kapusta, that changes everything! I briefly considered that option, but I thought 11 speed cassettes didn't fit on 8/9/10 speed freehubs. Now that I know I can do that it makes sense to go ahead and do 11 speed. It'll be nice to have a complete system, rather than mixing and matching parts to make it work.

See, I knew there would be smarter people than me on this forum. I appreciate the guidance.
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Old 01-31-19, 11:20 AM
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wsteve464
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Why if you are old and weak do you want to convert to 1x? I also am old and weak and that is why I won't go 1x. 2x gives you a 22 to a 28 tooth low gear.
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Old 01-31-19, 12:26 PM
  #6  
Kapusta
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Originally Posted by wsteve464 View Post
Why if you are old and weak do you want to convert to 1x? I also am old and weak and that is why I won't go 1x. 2x gives you a 22 to a 28 tooth low gear.
With a 46t large cog he can get pretty much as low as he wants with the right ring up front.

Last edited by Kapusta; 01-31-19 at 12:32 PM.
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