Originally Posted by joejack951

It is possible, through some careful tweeking, to be able to use all 8 rear cogs when in the middle ring on a Sora triple. My Sequoia is adjusted this way. While it's not exactly recommended, I do use all 8 cogs pretty frequently as I find the 42 ring to offer a great range of speeds.

Sora shifters have no intermediate shifts (trim). Start by making sure your high and low stops are set correctly then use tension adjustments to set the derailleur so that it does not rub when in the middle ring. Make sure the deraileur cage is set parallel to the frame before doing any of this.