'82/'83 1100e gearing

[Rob S.]

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


Mark

Even though there are more links per length of 530 than 630? (Aren't there more?)

[yank]

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.

[posplayr]

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.

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.

[Rob S.]

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

How many teeth on your front sprocket?

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?

[hikermikem]

Can't you remove the cover & look?

[blowerbike]

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?

small is bad in the front.
14 is ok on a 630 but a 13 will crunch the chain...bad bad bad.
spend a few minutes and pull the cover...count/know/replace if you like.

[Rob S.]

small is bad in the front.
14 is ok on a 630 but a 13 will crunch the chain...bad bad bad.
spend a few minutes and pull the cover...count/know/replace if you like.

Everything is getting replaced - two brand new sprockets and brand new chain at exactly the same time. Just trying to figure out if I want to change the gearing.

I'd like a less frantic engine speed on the highway, but I don't want to sacrifice any of that crazy 1100 acceleration we all love.

And I can easily see why too small in front is a no-no.

[yank]

You need a starting point or it's a crap shoot,pull the cover and count the teeth. Also it's well documented what would work to acheve what you are looking for, you need to know how many teeth are on the front sprocket. As Blowerbike said you do not want to be to small on the front.

[Rob S.]

I don't yet know what's on the front, but I don't like the idea of the front being different than stock, so I'll probably go with 15 and just use the back to adjust the gearing.

[posplayr]

I don't yet know what's on the front, but I don't like the idea of the front being different than stock, so I'll probably go with 15 and just use the back to adjust the gearing.

Yea thinking is never a good idea if it hurts.

[mmattockx]

Even though there are more links per length of 530 than 630? (Aren't there more?)

Think about it this way: if you put an extended swingarm on your bike do you think the gearing changes simply because you need a longer chain? As for the chain pitch, the center distance between the rollers (the chain pitch) is designated by the chain number, in 1/8" increments. The "5" in 530 means the pitch will be 5/8". 630 chain has a pitch of 6/8"(=3/4").

Rather than measuring the radiuses of the chain relative to the center, it is easier to count teeth.

Yep. It is really the pitch diameter ratio that matters, but the roller pitch has to be the same for both sprockets, so the tooth count is directly proportional to the pitch diameter and is far easier to measure.

small is bad in the front.

Yes, the smaller the sprocket the faster the chain wears. If you go really small you can get to a point where the loads on the chain components increase significantly and the chain can break at a much lower load than in a straight tensile test. None of our sprockets ever get that small but it can be an issue in industrial applications.


Mark

[gs1100ez]

sorry sorry

18/50 is what i ment

18/50

[earlfor]

How do you get a GS1100 motor all the way to 46,000 RPM????
Ray.

4.6K is 4600 rpm. (4.6 thousand)

[earlfor]

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?

Take 5 minutes to remove the cover and count the teeth on the counter shaft.

[blowerbike]

Take 5 minutes to remove the cover and count the teeth on the counter shaft.

he has to remove the foot peg and the shifter linkage at the engine.
he will then have to re install the shift linkage on the correct spline location.
then he will have to start a "new" thread..bike won't go into 1st or what ever.