I have a 2015 650LT with a 43T rear sprocket. It has the same effect on the gearing as lowering the front sprocket by one tooth. I did a highway trip through several states with a 80mph speed limit and was cruising at 85-90mph for long stretches. I didn't notice any extra vibration. The bike handled that speed fine - I do have a GIVI tall windshield which works amazingly well at keeping the wind blast off of me.