Originally Posted by
DaveSSS
You should never use the 50/29, so don't consider that a useable ratio. With 11 speed, that largest cog is little further to the left. You'll get more noise and chain wear, if you use that combo very much. If your frame has long chainstay it might not be so bad, but the typical 405-410mm stays don't work well with the big/big.
??? With an 11 speed the largest cog is at the same spot than on a 10 or 9 speed setup, not further to the left. The same applies to the smaller cog. All 3 systems use the same freehub size, what changes is the spacing between the cogs and, of course, the width of the chain.
If your front derailleur is properly set you should be able to use the 50/29 without a rubbing, even with a bike with short chain stays (402mm on my bike). There will be some cross chaining additional wear on the components but nothing to worry if you don't spend the whole day in this setting.