I read this post and just changed from a 16 to a 17 tooth front sprocket today on my '03 Speedmaster. I was hitting about 3200 rpm at just 50mph with my 16 tooth.
I now really love the 17 and wish I had went to it before now. I didn't lose very much roll on power in any gear. The big plus I saw today is that it is a lot more comfortable at highway speeds over 60mph with the lower rpms. I was a little afraid that an 18 toother wouldn't have been my cup of tea for riding around town.
Bob
