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before switching to the 16t front sprocket I could hit 80mph which = 8000RPM going down hill or with a decent tail wind. I've never been able to get past this. If you browse over to the 16t sprocket thread, I don't remember who but someone put up a nice graph of rpm vs speed with both the 15 and 16t sprocket. Since adding the 16t sprocket, the fasted I could go was 79mph. I don't remember what RPM's that was but the graph should give you an idea. If you're considering the 16t front sprocket. It makes riding in town better since it spreads the gears out a bit and on the highway the engine doesn't sound so angry. The only down side is that is may have knocked a couple mph off my top speed as it takes longer to get up to 75mph and very difficult if not impossible to go faster. Although 4th is usable up to about 65 for going up hill. and if you don't like it, you're only out about 18 bucks and another 20 minutes to switch back to the old sprocket.
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