As promised: (Review of the 14 Tooth Sprocket in a Ducati 620cc)
OK, just got back from a 50 mile loop that throws everything at you from twisties to long straights.
I rode through town, and the traffic was normal, busier than a one legged man at a butt-kicking contest. The 14T allowed me to get out of first gear in bumper to bumper 30-35 MPH traffic. I didn't have to slip the clutch above 8MPH.
The bike runs at a little higher revs, but seems to find the "sweet spot easier, 4500-7500 RPM's. As the road opened up to sweepers I opened it up. Instead of doing 35 MPH curves at 50 MPH in third gear I was in fourth at the same speed, with plenty more to give.
As I got into the tight stuff, first gear with the 15 tooth sprocket, I was in second gear and humming along fine. The bike seems to have a little better engine braking capability too. I went in "hot" on an "S Curve" and had to trail brake, no problems. The bike also wanted to "punch" out of the corners with what felt like more gusto.
Then I got on the long straight. At 65 MPH I was able to put it into sixth gear. I was holding at 75 MPH and the bike still wanted to move faster. I don't know why Ducati set their gearing so that you don't use overdrive until 75+ MPH, the maximum speed limit here in the United States is 75 MPH on the Interstates.
In short, this is the best change one can make to a Ducati 620 that has the 15 Tooth front sprocket. It makes it "friendlier" and easier to use around town, yet still gives you plenty of punch for the Interstate. I will check the true top-end speed when I have a chance, but I don't think I'm going to lose anything there. The fastest I was able to get Evangelina to go with the 15 Tooth was 106 MPH. It's the aerodynamics not the gearing that slows it down.
Take care and ride safe. I hope this answers some questions for people regarding the 14/15 controversy. ;c