Jim,
If your question has not been answered by the posts above, and you can provide the following information, the RPM/speed calculator at the link below might help you:
You will need:
1. The high-gear ratio of your transmission
2. The ratio of your rear-end (the higher of the two-speed ratios)
3. The diameter (rolling diameter, preferably) of your rear tires
http://www.csgnetwork.com/multirpmcalc.html (use the "Transmission Final Gear Ratio Manual Entry" near the bottom of the page)
The RPM at any speed will be displayed/calculated.
