I am looking at doing a bit of bikepacking on my Giant Revolt 1. The gearing on this is 50/34 front and 11/34 back. Bearing in mind I am 15 stone would my granny gear be enough to carry my kit or do I need to look at trying to get an 11/36 on the back (or bigger)? My rear derailleur is Shimano R350 (basically old tiagra 4600 I think?). I've seen a video where you can fit an 11/36 on this by switching the B screw around and adding a chain link. Anyone got experience of this? Otherwise I suppose I could just fir a mtb RD - I am aware that this needs to be 9 speed to deal with cable pull issues. I'm not sure I can get anything bigger on there???