Thanks tmax. I appreciate your input. It's nice to hear from someone who has gone from the 19/42 combo to the belt drive. I installed an 18 tooth sprocket (removed the 19) on my speedy today to see how it would be. It's nice. A bit easier to ride around town and pretty good on the highway.
The 18 tooth sprocket runs about 4000 rpm at 70 mph. This is a true 70mph, not 70mph on the speedometer.

tmax, maybe you could do me a favour.... find out what your tach reads at a true 70 mph. If your speedo is out the way mine was, 77mph on the speedo would give you a true 70 mph.
Thanks.