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I am building a bike and I am using 10 speed Shimano 105 shifters.
On the back I am using a 11 speed 105 rear derailluer (because is the only one I have at the moment).
The cassette I am using is a standard SHIMANO TIAGRA CS-HG500-10 10 SPEED CASSETTE 11-25T.

Unfortunately, I am having some problems: when in biggest cog or second one, the chain moves out of the tension pulley and gets stuck (by the way the chain is a 11 speed chain, so width should not be an issue).

Does it seem like there could be something wrong with the chain line?

Any of you knows why it happens? Did it happen to you?

Thanks already for your input!

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    It happens because 11 and 10 speed shimano road components are incompatible, namely derailleurs and shifters. – Klaster_1 Jan 12 '17 at 14:54
  • Interestingly I use an 11 speed Campagnolo Athena rear mech with 10 speed Campagnolo Centaur shifters and it shifts absolutely fine, you really wouldn't know. – Drew Jan 12 '17 at 16:26
  • I think that Campagnolo might be the exception... but I honestly did not know about the incompatibility in pull ratio between 10 and 11 road shimano shifters. Thanks for clarifying it for me. – Paolo Goatspeed Jan 12 '17 at 16:51
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    Yes, Campagnolo changed cable pull between 8- and 9-speed and has been the same since then. It's also not compatible with Shimano without adapters or cable routing kludges. – ojs Jan 1 '18 at 14:28
  • @PaoloGoatspeed SRAM also uses the same pull ratio on 10 and 11 speed road rear derailleurs, making them interchangeable. Shimano however is active heading in the opposite direction. – Rider_X Oct 15 '18 at 13:52
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This is to do with the different pull ratios employed by the different systems. In your case 10 vs 11 speed Shimano.

http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/

If you look at the table in the link - it says the 10 speed levers pull less than the 11 speed levers but the rear derailleur ratios are also vastly different.

  • I understand the difference in pull-ratio, and as soon as I tried it I realised it. What I don't understand is why the chain, which is a 11 speed speed one, so perfect in width, on the 2 biggest cogs get off the pulley wheel. is it because of the inclination of the chain? I must say that I have put on a SLX triple crankset...so the angles of the chain are definitely all messed up. – Paolo Goatspeed Jan 12 '17 at 16:53
  • Hard to say without seeing first-hand. I suspect it's alignment of the rear derailleur in those gears. If you can adjust the skipping out using the barrel adjuster - it will prove it is alignment. – OraNob Jan 13 '17 at 20:32
  • looks like that the problem is the alignment of the chain...but ca't be sure...very weird, never seen a chain getting out like that. – Paolo Goatspeed Jan 14 '17 at 16:28
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In my humble opinion it should work if you use a 10 speed chain instead of a 11spd chian.... The chain width is determined more by the cassette than the RD...The RD does only what the shifters tell it to do.....The spacing between the sprockets on a 11 spd cassette are narrower than those on a 10 speed cassette....Since you are using a 10 speed cassette....try using a 10 speed chain..... I am fairly confident that it should work......Good luck

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    No, it will not work. 11 speed Shimano systems use a different cable pull ratio, which means the 10 and 11 speed derailleurs move different amounts for the same length of cable pull. The derailleur will not index the chain correctly. – Argenti Apparatus Oct 15 '18 at 13:09
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    Welcome to the site. I've downvoted your answer because you're just stating your opinion (that the problem is the chain) and this opinion directly contradicts the existing answer, which is backed up by technical sources. In particular, the derailleur doesn't just "do what the shifters tell it to do". The shifters move the cable a certain amount and the arm of the derailleur translates that into a certain amount of horizontal motion. The problem in this case is that the two are incompatible so the derailleur moves the wrong amount for each move of the cable. – David Richerby Oct 15 '18 at 13:10
  • You'd be right if the question was about 6/7/8 speed systems, where the inter-cog gap is the same, or any system with a plain non-indexed friction shifter. – Criggie Oct 17 '18 at 0:30
  • yes, it would not work. Unfortunately shimano compatibility is much trickier than that. Appreciated anyway the try and it is good to understand insights of how this all works – Paolo Goatspeed Oct 19 '18 at 10:16

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