What sprockets for 70MPH or more.
Hello I am wondering what the best sprocket setup would be to get a boost in speed as first gear is really short and my top speed is 55mph. Looking to get top speed around 70-75 so I'm not pushing it riding around town where the speed limits of the major roads I take is 45-50MPH
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If Yes: The best you will do with no engine mods other than jetting the stock carb properly is about 62-ish MPH, no matter what sprockets you have. With a full exhaust you then push that limit up to about 65-68mph. If you want any more than that you will be entering the realm of rapidly diminishing returns looking at big engine upgrades. Ported head and a cam at a minimum. Which will get you to, and a bit past, that 70mph barrier. On flat ground with no wind fighting you. You WILL need at least a 17 front and 45 rear sprocket to even have a chance of turning the RPM needed to hit 75 - which will happen right at 8000rpm. |
Yep, you need something with more motor.
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There's only one source for the Magic Sprocket -- and I ain't tellin'...
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OP, I'm running a 47 rear and 17 front. On hilly country roads with knobby tires and wind from somewhere always, my max speed has been 68mph. |
The only reason that I run a 46 tooth sprocket is because I already had 2 , one from my old Brozz , and one that was evidently stock with the TBR7, that I bought slightly used. I tried the 17 tooth with the 46 when the bike was basically stock, and thought about keeping it, BUT on certain long fast hills the bike ran out of steam too fast, so I switched to a 16 tooth front,and the bike did a lot better. I modded my motor, and got noticably more power, and a more fast road compatible power curve, so I put my 17 back on the front, and it was just right. I was still on the stock knobby when I put the 17 on, but have since put a Dunlop D605 , 4.60x18 on the rear, and I can tell it geared me down just a little from what it was with the knobby, which evidently had a larger diameter. I'm still very satisfied with the Hawk now, to the point of being too satisfied, because I am riding it so often, and for longer faster rides, that I bought the KPX for. LOL. I have been riding the KPX more often in the last couple of weeks. The Hawk was taching close to 8,000 at 70( true GPS verified )with the D605, it will still run 70, but is just starting to go beyond 8,000.
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If you gear for 70+ you better hope there's a tornado at your back at all times in addition to always rolling downhill
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17 and 39 on the back,yep 68 mph. Thats all it will do.
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I'm not a big guy. I'm 5'8" and hover between 150 and 155....might be why I get away with my gearing.
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