MTB Shimano 3-9 conversion to 1-11... Where do I get started?

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MTB Shimano 3-9 conversion to 1-11... Where do I get started?
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Posted: Mar 31, 2020 at 21:01 Quote
Circa '14 Giant Stance
I'd like to upgrade the gear box... remove the front derailleur and make the conversion from a 3-9 to 1-11. Current components are Shimano and FSA BB and crank.

Looking for some guidance and how to match up a new crank, bb and rear cassette, (if the cassette will fit).
What should I look for in the new components, so they will match up with my system?

Posted: Apr 1, 2020 at 3:19 Quote
The cassette will fit, Shimano freehub bodies can accommodate all speeds up to 11 (12 speed uses a different freehub body). You will need an 11 speed derailleur also.

You could go down the ghetto route and bolt a single NW chainring to the centre spider on your existing cranks. Won't look great but should be able to get it to work, if you can get a chainring with the correct BCD.

If you want to do it right you will want a new BB and cranks to suit. Can't find out what type of BB you have currently, but I suspect it'll be a square taper type, which won't work with a new 1x crankset.

Posted: Apr 1, 2020 at 12:58 Quote
Davec85 wrote:
The cassette will fit, Shimano freehub bodies can accommodate all speeds up to 11 (12 speed uses a different freehub body). You will need an 11 speed derailleur also.

You could go down the ghetto route and bolt a single NW chainring to the centre spider on your existing cranks. Won't look great but should be able to get it to work, if you can get a chainring with the correct BCD.

If you want to do it right you will want a new BB and cranks to suit. Can't find out what type of BB you have currently, but I suspect it'll be a square taper type, which won't work with a new 1x crankset.




Thanks for your advice and input! tup

That’s great news, that Shimano freehub bodies can accommodate all speeds, up to 11.
I’ll look for a cassette and derailleur. Any recommendations? Do I necessarily need to pay attention to crank and chain ring compatibility with the cassette?

Here’s my setup…

BB
https://www.dropbox.com/s/tpms8slqhufylsp/BB.JPG?dl=0

cassette
https://www.dropbox.com/s/4jgzsyiqqdp5x8f/cassette.JPG?dl=0

crank
https://www.dropbox.com/s/jyqypu2iswkzhb7/crank.JPG?dl=0

I’d like to get a 2-piece crank and compatible BB that will be at least the same quality and performance, if not better, than the existing FSA models.

Posted: Apr 1, 2020 at 14:33 Quote
Can't really go wrong with Shimano SLX, or if you want crisper shifting you can go for Shimano XT. You will want cranks with a 24mm spindle, which both XT and SLX will be. Your current BB is suitable, but if you want to swap it out you will want a BB92 standard.

You could go for an XT shifter with SLX derailleur and cassette. The XT shifters are much better than SLX. Below is what you need, with some links to examples.

11 speed, 11-46 cassette, XT or SLX depending on your budget (SLX is heavier).

https://www.chainreactioncycles.com/mobile/shimano-xt-m8000-11-46t-cassette-11-speed-/rp-prod149701

11 speed Shimano derailleur, either XT or SLX, medium cage

https://www.chainreactioncycles.com/mobile/shimano-slx-m7000-11sp-rear-derailleur/rp-prod148563

11 speed shifter, SLX or XT

https://www.chainreactioncycles.com/mobile/shimano-xt-m8000-11-speed-trigger-shifter/rp-prod135894

SLX or XT cranks with single NW chainring. Either 30 or 32t, depending on what range you want.

https://www.chainreactioncycles.com/mobile/shimano-slx-m7000-single-11-speed-crankset/rp-prod148289

Any 11 speed chain and you probably want a new shift cable too.

This is all assuming you want to stay Shimano and not move to SRAM. It does get quite expensive when you add it all up!! Pretty sure all of the above is compatible with your bike but please double check. Happy shopping.

Posted: Apr 7, 2020 at 12:31 Quote
Great information! Thanks very much for the guidance.

I am a bit short in the tool department, so I ordered some bb tools for the R&R of the bb.

With my budget, I'll upgrade the bb, crank and chainring first, then in the next round I'll upgrade the cassette, mech, shifter and cable.

Thanks again, brother!

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