Originally Posted by Fentuz

I have a sora short cage derailleur which is specified for 30 teeth max but the cage has the same dimensions as the altus M310 specified for 32 max... In the past, with these derailleurs, I rode without any issue with a Sora 11-34 cassette and Sunrace or Acera 11-36...
With 11-40 I knew I was pushing the limits but ..