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Would a SLX M7000 11 speed SGS work with a 50-39-30 road triple?

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Would a SLX M7000 11 speed SGS work with a 50-39-30 road triple?

Old 12-21-17, 11:59 AM
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KaisoArt
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Would a SLX M7000 11 speed SGS work with a 50-39-30 road triple?

The SLX M7000 11 speed SGS is listed as 2x11 (42t max cog), 1x11 (46t max cog) I would like to run it with a triple. FSA SLK-Light road cranks 50-39-30. This is for a recumbent with a long chain line if that matters.
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Old 12-21-17, 01:13 PM
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maddog34
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50 or 54 total tooth change... good luck finding a rear der. with that max tooth range.

there are add-on tensioners that will extend the range....

balancing a loaded touring tandem at the low speeds expected from a 30 front,46 rear combo.... that will be the true challenge...
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Old 12-21-17, 01:43 PM
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The SGS total capacity is 43t. That means with a 20t difference in the front there can only be a 23t difference in the back. That is 11-34. Other than that im sure you can run it with a triple.
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Old 12-21-17, 01:43 PM
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You'll get better answers if you specify the cassette and shifters you plan to use.
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Old 12-21-17, 02:46 PM
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You could cheat if you're careful in shifting, just stay away from the 11-13-15 cogs when your in the 30t ring.

Really though you only gain one more lower gear with the 11-40(42) cassette compared with the 11-34. The final three cogs in an 11-40 are 31-35-40 or 32-36-42. I understand how tempting that extra gear is when it could possibly mean not having to shift rings.

Why the m7000 rd? Is it the capacity or did you want a clutch rd?

edit: duh of course capacity!

Last edited by GrainBrain; 12-21-17 at 03:19 PM.
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Old 12-21-17, 06:31 PM
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Here is the deal, this is not for any of my 2 wheelers, but for a soon arriving 3 wheeler. The rear is 26" with cheapo X4 and grip shifts. I figured for the purpose of fun tinkering and upgrading I'd like to make it 11-speed. The wheel is 8,9,10 compatible. On another thread I was told that, an Shimano mountain 11 Speed cassette 40t and up will fit a 8,9,10 hub because the 40t ring is machined so it overhangs the hub flange. That the actual cassette body is the same width as a 10-speed. (Not the case with the Road cassettes) I have FSA SLK-Light road cranks 50-39-30 on another bike and was going to transfer it over. I was hoping the 11-40 11 cog with a SLX 11-speed long cage and the 50-39-30 triple would work. I do want the clutch on the RD as chain slap is prevalent in many 3 wheelers.

It seems that may be problematic, so the options are, go 11-34 and get an 11-speed capable wheel, or abandon using the road SLK cranks for something else. I'm open to suggestions.

This is what I'm tinkering with. HP Velotechnik - Products - Gekko US edition (recumbent trike) (Sport configuration)
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Old 12-22-17, 02:19 AM
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For the SLX 11 speed RD, they don't list a SGS cage, only a GS cage (see 2017-2018 SHIMANO Product Information Web

For the SLX 10 speed RD, they list both a GS and SGS version. The specifications for the SGS are
Max. front difference 22T
Total capacity 43T
Low sprocket Max. 36T, Min. 32T
High sprocket Max 11T, Min 11T

So based on the above, no the 11 speed SLX RD is not compatible as it is not designed for a 3 x crankset nor is there a SGS version, but the older 10 speed SLX RD is compatible assming you are not exceeding the max chain capacity or largesmall cog size. Would it work with your shifters/cassette (which you didn't specify). I believe both are Dyna-shift so a 10 speed RD may work fine with 11 speed cog/chain/etc. Others would know this better than me.
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Old 12-22-17, 01:00 PM
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Shimano has a new road cassette, cs-r8000 11-34 that fits a standard 8-9-10 freehub just like the 11-40.
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Old 12-22-17, 01:13 PM
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SGS is the rear derailleur cage length category right?

the math: cassette (smallest - largest tooth count) + the crank (smallest - the largest chain ring t) = X

that is the chain wrap amount of slack the RD has to cope with , that requires a longer cage ..

If it were less you can use a shorter one..





....
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Old 12-26-17, 11:56 AM
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Originally Posted by GrainBrain View Post
Shimano has a new road cassette, cs-r8000 11-34 that fits a standard 8-9-10 freehub just like the 11-40.
Thanks for that info. I found one reference to it fitting 8.9.10 speed hubs. However, all other references make no mention of it, and none show a picture of the back of the cassette. I hope you are correct. I'll check further.
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Old 12-26-17, 11:57 AM
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Originally Posted by fietsbob View Post
SGS is the rear derailleur cage length category right?

the math: cassette (smallest - largest tooth count) + the crank (smallest - the largest chain ring t) = X

that is the chain wrap amount of slack the RD has to cope with , that requires a longer cage ..

If it were less you can use a shorter one.

....
Thanks. just what I was looking for. I'll keep this info handy.
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Old 12-26-17, 02:39 PM
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Originally Posted by GrainBrain View Post
Shimano has a new road cassette, cs-r8000 11-34 that fits a standard 8-9-10 freehub just like the 11-40.
Could you provide a link to more info on this? I'm not finding much.
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Old 12-26-17, 03:38 PM
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2017-2018 Shimano product compatibility

The first few pages are the index, in the index it's titled Cassette Sprocket. You can scroll to page 30 of the PDF and it will state that the 11-34 needs a 1.85mm spacer when used on an 11 speed road hub, and that an 11 speed mtb hub is equal to a 9,10 hub. There's a few pictures of it.
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Old 12-26-17, 06:11 PM
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Originally Posted by KaisoArt View Post
Could you provide a link to more info on this? I'm not finding much.
https://www.bike-discount.de/en/buy/...0-11-34-625085

It may not appear on the Shimano homepage. Shimano is very lazy about updating their main page.
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