I should have done this way before now ! For the past couple of years, every time I get on the highway at cruising speeds of around 65 and higher, I feel like I need a sixth gear. The engine just sounds way to wound up to me. At any rate, I kept reading about going to a different front sprocket and how much better it is at highway speeds. I changed the 17 tooth front sprocket to an 18 and WOW - what a difference. I can't believe the difference. I almost went to a 19 and the place that works on my bike convinced me an 18 would be perfect. They were right.
My days of racing from red light to red light are long over, but honestly, I can't even tell the difference in the low end - it still pulls like a freight train - at least plenty enough for me.
I only wish I'd done this a couple of years ago instead of waiting. This was probably the best $50 I've spent on the SM ( $ 20 on sprocket and $30 to have it put in - I know I could have done it myself ! )
I noted the RPM's with the 17 going around 60 was right at 4000 -- with the 18 it was just under 3500 -- now when I'm in 4th gear, it feels like 5th and in 5th going 65-70 - it so much darn smoother, it's like having a new bike ! Yep, I'm happy !