Grant makes the point in copy that manufacturers under-rate their derailleur capacity - I've found it to be generally true that you can push a derailleur past it's design goal - I ran a '78 shimano 600 RD with 8-speed freewheel. I'm running a 29 on my daughter's indexed Ultegra short cage and noticed that even before I adjusted the mount rotation screw to clear the low gear, it would hop right into the low gear just fine.
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