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  #1 (permalink)  
Old 02-10-2012, 01:14 PM
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Sportster Sprocket Teeth Count

Im building a rigid 95' sportster 883 converted 1200 with thunderstorm heads/pistons and screamin eagle .536 lift cams. Im converting over to chain drive and wanted some input on sprockets. I was thinking 24 front and 51 rear, but want to be able to cruise at 75mph without major problems. Whats your thoughts? Think i should go 23 front 48 rear? I thought the 883 had more gear than the 1200 to start with? thoughts?
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Old 02-10-2012, 01:21 PM
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Heres the bike


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Old 02-10-2012, 02:01 PM
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both of those sets of gearing are just a tick off 2:1 (the same ratio) so those numbers don't matter.
find out what the stock final drive ratio was and add 1 tooth over stock on the counter shaft sprocket for ever 5 mph over what ever your crusing speed / engine rpm was to maintain the same (close) rpm at 75 mph.
say stock was 21:51 @ 65 you would add 2 teeth 23:51
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Old 02-11-2012, 07:40 PM
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I have 23/49 on mine and that is about the same as I had with the stock93 1200 belt pulleys.
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Rottenralph 1993 1200 sportster super sport with JET stage 3 heads, 10.5 to 1 wisecos, s&s with thunderjet, dyna ignition, and too much more to list. . If it aint broke get a bigger hammer .

Last edited by rottenralph; 02-11-2012 at 07:44 PM..
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Old 05-01-2012, 02:27 PM
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I just ordered up a 22 front and 47 rear for my 02 XL1200
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Old 05-01-2012, 04:14 PM
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i had 26/51 on my '75 1000cc
ran really good at 75
1st was a little tuff on clutches
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Old 05-01-2012, 05:57 PM
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I like this gear ratio/RPM calculator. I found it to be pretty accurate...

Motorcycle gear/rpm/speed calculator
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Old 07-10-2012, 11:39 AM
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22 and 47 turned out to be a little high revving at highway speed for me so I'm converting to 23 and 47.
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Old 07-10-2012, 01:56 PM
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Quote:
Originally Posted by EscaladeSteve View Post
22 and 47 turned out to be a little high revving at highway speed for me so I'm converting to 23 and 47.
I just put a 23 on the front of my Sportster, I had to remove a little material from the cover and one of the shoulders on the case for clearance...not much though.
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Old 07-10-2012, 04:35 PM
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Thats the reason I went 22 to begin with, hoping it was just big enough since I went 47 in the back. I was worried about having to modify the cover. Oh well, Ive come this far a little more effort wont kill me.
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