I always figured it to be about 75mph.
My rational: that is what I run on my commute. The speed limit is 70mph. Most of the traffic will do close to 75 in a 70 around here. My speedo reads about 82 at 6K rpms. The traffic is some passing me and some slower than me, an equal balance, so it should be just about 75mph.
As you can see it don't have an exact science the way I do it.
Looks to me like changing the front sprocket makes about a 500 rpm difference up or down.
At 6000 RPM...
14-tooth = ~70 MPH
15-tooth (stock) = ~75 MPH
16-tooth = ~ 80 MPH (although I usually ride at 5500 for an indicated 80 MPH)
Now I have to wonder how much difference these changes make in the MPG we get. As far as I can tell, I get about the same mileage with my 16-tooth as folks get with the stock 15-tooth sprocket (50-55 MPG in a mix of riding).
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