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'82/'83 1100e gearing

Rob S.

Rob S.

Forum Guru
Past Site Supporter
My '82 spins about 4.6/4.7k at indicated 70 mph. 40-tooth rear sprocket with 630 chain.

I'm curious to know what other 1100EZ/EDs are revving.
 
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Rob S. said:
My '82 spins about 46/47k at indicated 70 mph. 40-tooth rear sprocket with 630 chain.

I'm curious to know what other 1100EZ/EDs are revving.
Click to expand...

If I remember correctly, my '81 1100 runs a little over 4K at 70mph with a 50T rear & 18T front, 530 chain.
 
Yes, I made a typo.

But let's see...four answers, one is serious, the other three are snide comments. On this site? How shocking! "Surprise, surprise!" as Gomer Pyle would have said.
 
Stock sprockets are 15 teeth up front and 42 teeth in the rear. At 70mph with oem-sized tires your engine will be spinning at 4450 rpm in 5th gear.
 
Griffin said:
Stock sprockets are 15 teeth up front and 42 teeth in the rear. At 70mph with oem-sized tires your engine will be spinning at 4450 rpm in 5th gear.
Click to expand...

To elaborate, if you still have a 15 tooth sprocket up front, the 40 tooth on the rear gives you 4673 rpm at 70mph.
 
The way my ten-speed works, smaller in the back equals less rpms for my engine (feet).

I can't see why my motorcycle would be any different.
 
Rob S. said:
The way my ten-speed works, smaller in the back equals less rpms for my engine (feet).

I can't see why my motorcycle would be any different.
Click to expand...


You're right, I did the math backwards. 15/40 comes out to 4238 rpm at 70mph.

How many teeth on your front sprocket?
 
around 5k at 80mph
stock gearing

just changed to 530 chain
15/50
seems to be the same
 
15/50 huh>
what>?
thats 1/4 mile stuff unless 530 changes it that much.
you would spend you day shifting or umm revving really hard.
someone splain plez?
 
50/15 = 3.4 = crazy high rpm for street bike
 
gs1100ez said:
around 5k at 80mph
stock gearing

just changed to 530 chain
15/50
seems to be the same
Click to expand...

15/50 is a huge jump from stock, 19% lower. Unless you have something wrong in your numbers there is no way that would seem to be the same. If you ran 4500rpm before you would now be running 5355rpm at the same speed.


blowerbike said:
unless 530 changes it that much.
Click to expand...

The chain size has nothing to do with it, the drive reduction is only based on the number of teeth on each sprocket.


Mark
 
It is in the relationship of sprocket rotations to each other more then the chain , it can be only so long being a 530 or a 630 with a stock swing arm.
 
yank said:
It is in the relationship of sprocket rotations to each other more then the chain , it can be only so long being a 530 or a 630 with a stock swing arm.
Click to expand...

true, but it is the tooth ratio that directly specifies the ideal mechanical advantage and therefore is easily equated to the gear ratio. Generally this is the easiest parameter to understand as well as measure.


The rotation rates of counters sprocket and rear sprocket are inversely related to radius (relative to center of rotation) of the the linear chain motion relative to a common frame or reference (the bike). Rather than measuring the radiuses of the chain relative to the center, it is easier to count teeth.
 
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Griffin said:
You're right, I did the math backwards. 15/40 comes out to 4238 rpm at 70mph.

How many teeth on your front sprocket?
Click to expand...

So if I have a 40 rear, and I'm revving approx 4,650 rpm at an indicated 70 mph, can anyone figure out how many teeth are on my front sprocket?

One of the reasons I'm confused is that stock is 15/42, and that produces 3811 rpm at 60. I think I'm revving slightly higher than that, but my 40-tooth rear leads me to believe I should be revving less. Smaller rear, "geared up," revving lower, correct?

So my front must be very small, correct? How much smaller than 15 could it be?
 
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