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Author Topic: Sprocket, how many teeth?  (Read 1262 times)

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Offline 736cc

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Sprocket, how many teeth?
« on: October 30, 2012, 01:21:21 PM »
   If I re-gear with 2 less teeth on my rear sprocket, is it 1 or 2 less links for a new chain?
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Offline Pat_at_APE

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Re: Sprocket, how many teeth?
« Reply #1 on: October 30, 2012, 01:30:23 PM »
I would guess that you could just adjust the wheel further back and compensate for that.  The difference in sprocket diameter is going to be pretty small. 

Removing one pitch of 530 chain (one inner and one outer) moves the axle forward only half an inch. 

Pat at APE
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Offline 736cc

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Re: Sprocket, how many teeth?
« Reply #2 on: October 30, 2012, 01:37:02 PM »
Well, I have a 78 SS with a 630 chain and ran outa adjustment
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Offline markb

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Re: Sprocket, how many teeth?
« Reply #3 on: October 30, 2012, 01:49:44 PM »
Quote from: Pat_at_APE on October 30, 2012, 01:30:23 PM
Removing one pitch of 530 chain (one inner and one outer) moves the axle forward only half an inch. 
The pitch of 530 chain is 5/8".
Quote from: 736cc on October 30, 2012, 01:21:21 PM
   If I re-gear with 2 less teeth on my rear sprocket, is it 1 or 2 less links for a new chain?
2 links (pitches)
Quote from: 736cc on October 30, 2012, 01:37:02 PM
Well, I have a 78 SS with a 630 chain and ran outa adjustment
The pitch on a 630 chain is 3/4" so you will be removing 1 1/2" of chain to keep you axle in the same spot.
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Offline 736cc

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Re: Sprocket, how many teeth?
« Reply #4 on: October 30, 2012, 02:02:26 PM »
Thank you for that technical explanation of pitch dimensions, you learn something new everyday (if you are lucky). The good news is my plan to increase top-end speed w/ the new gearing and the improved aerodynamics (courtesy of my Don Vesco fairing), my 78 SS will now effortlessly pull 125+ mph. Previously, 115 was where it ran out steam at 115.
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bollingball

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Re: Sprocket, how many teeth?
« Reply #5 on: October 30, 2012, 02:04:19 PM »
How old is this 630 chain? Why did you run out of adj. did it stretch? If that happened then it may be time for a new one. How do the sprockets look? Oh it looks like you bought a new one and it is to long.
Ken
« Last Edit: October 30, 2012, 02:06:24 PM by bollingball »
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bollingball

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Re: Sprocket, how many teeth?
« Reply #6 on: October 30, 2012, 02:08:22 PM »
I just slide the wheel up and cut the chain to fit.
Ken
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Offline Pat_at_APE

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Re: Sprocket, how many teeth?
« Reply #7 on: October 30, 2012, 02:12:13 PM »
I converted my 77 CB750F2 over to 530 chain when my 630 chain wore out.  Very happy with it so far although I'm going to change the front sprocket +1 to change the ratio a bit.  I'm at 3:1 now and want to change to 2.8:1 to drop the rpm at cruise a little.

Pat

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Offline Gordon

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Re: Sprocket, how many teeth?
« Reply #8 on: October 30, 2012, 02:43:34 PM »
Chain links are in pairs, so you have to remove at least two at a time.  It's entirely possible I'm either misunderstanding or just being to literal. :-\
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Offline markb

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Re: Sprocket, how many teeth?
« Reply #9 on: October 30, 2012, 02:58:01 PM »
That correct unless you use a half link which I wouldn't do on a motorcycle.  In any case the pitch is still from one pin to the next.
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Offline Shane72

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Re: Sprocket, how many teeth?
« Reply #10 on: October 30, 2012, 07:52:49 PM »
Concur with the last two posters.

Shane
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