Difference between 34t and 36t sprocket?

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dumpstercrusher

New Member
Is there a big difference between the 34 tooth and 36 tooth sprocket? Running a 36 is great in my opinion because above 23mph the vibrations go away and its nothing but smoothness and also my motor produces enough torque to not really feel a difference between the 44t and 36t.
 
The general rule of thumb is about 1 mph per tooth, with less teeth adding more speed. Therefore, a 34t would get you roughly 2mph more than a 36t. In actuality, you may not see much difference with losses from friction in the drivetrain. While we are on the subject, and inch of diameter on a belt pulley or wheel is equal to one tooth on a toothed gear. Therefore a 24" wheel would go 2mph slower than a 26" wheel. Just a little fyi on gear sizes.
 
bigbutterbean said:
The general rule of thumb is about 1 mph per tooth, with less teeth adding more speed. Therefore, a 34t would get you roughly 2mph more than a 36t. In actuality, you may not see much difference with losses from friction in the drivetrain. While we are on the subject, and inch of diameter on a belt pulley or wheel is equal to one tooth on a toothed gear. Therefore a 24" wheel would go 2mph slower than a 26" wheel. Just a little fyi on gear sizes.
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thanks! im not looking at top speed because when u get above 40 mph it gets a bit scary on a bicycle lol, but more in if there is any noticeable difference. Doesnt have to be big, jus a tad. im debating if i should move to a 34t sprocket so i can put my 36t on the spare bike I have, but then that changes my cruising speeds. I normally cruise at 25-30 by myself because my powerband is so smooth, but my spare bike can not keep up with me so i have to cruise around 20 which makes it jerky when letting off the throttle.
 
dumpstercrusher said:
thanks! im not looking at top speed because when u get above 40 mph it gets a bit scary on a bicycle lol, but more in if there is any noticeable difference. Doesnt have to be big, jus a tad. im debating if i should move to a 34t sprocket so i can put my 36t on the spare bike I have, but then that changes my cruising speeds. I normally cruise at 25-30 by myself because my powerband is so smooth, but my spare bike can not keep up with me so i have to cruise around 20 which makes it jerky when letting off the throttle.
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A well tuned carb and a good exhaust will have the spare bike cruising at 30mph easy with a stock engine and a 36T rear sprocket.

Map.wee.
 
mapbike said:
A well tuned carb and a good exhaust will have the spare bike cruising at 30mph easy with a stock engine and a 36T rear sprocket.

Map.wee.
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thats what im thinking as well. u know if the nt carbs are 5mm like my dellorto carb? Would like to tune it but then the spark plug when i checked before seemed good
 
I was running a 36 steel sprocket and switched to 34 alloy- even SMOOTHER, and that's the very word I described it when I posted it a couple of years back-

http://motorbicycling.com/showthread.php?t=35916

I wouldn't run it across any mountains, but here in flat Florida, it goes nicely with a stock 66 with stock NT Speed carb- I easily cruise at 25 to 30 with 27 x 1 1/4 wheels,

have pushed it up to 35 just to see (on the analog speedo) and it would go a little more even- but no need to

here's the latest incarnation in thread from last month:
http://motorbicycling.com/showthread.php?p=498796
 
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dumpstercrusher said:
thats what im thinking as well. u know if the nt carbs are 5mm like my dellorto carb? Would like to tune it but then the spark plug when i checked before seemed good
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Im pretty sure they're all 5mm I just solder and redrill mine to tune them, never replaced a jet, no sense in buying jets when its so easy just to solder and redrill them and get a fine tune on them that way, if it doesnt 4 stroke at cruise speed then you probably have an ok tune on it but if it does then you'll notice a performance increase by decreasing main jet size.

Map
 
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