Ive converted my bike to a 2X10 setup, so dont have the 42 tooth gear any more, its basically 24/32 on the front with 11-36 on the back. The chain is a Shimano SLX 10 speed one, not sure if that makes any difference (aren't they thinner than 9 speed chains?)
He means using the small front ring and a smaller sprocket on the back.
For example:
small front ring (24) and 28 sprocket is the exact same gear ratio as the 32 ring in the 36 sprocket but should give you a much straighter chainline.
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