Had the 46 on last year and put the 16 on today. First impression is that engine braking has increased. 3rd gear feels like an extended 2nd gear and 4th gear like an extended 3rd. It is buzzier than before, or just more urgent feeling. There is a sort of hum/whine around 130km/h in any gear even with a bumpered sprocket. This noise wasn’t there with the original 17 tooth, no bumper sprocket. Any ideas?