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31 toothfront belt sprocket and 66 rear

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  #11  
Old 04-17-2020 | 10:26 AM
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Iron Horse 13
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Originally Posted by sirrom1
Comparison of 28/68 to 31/66, in numbers, is right. The change results in a 13.6% change. But, this final drive ratio (31/66) is well within an acceptable performance range for the 883.
The "stock" final drive ratio (primary, 34/57 & drive pulleys, 28/68) is 4.07:1. The 31/66 final ratio is 3.68:1. For reference the final drive ratio for the 1200 (primary, 38/57 & drive pulleys, 29/68) is 3.52.
For anyone enjoying a 70 mph cruise rpm of about 3770, or 4850 rpm at 90 mph, the 28/68 final drive is great. But for those that prefer to cruise along at about 3300 the 31/66 pulley combination can get you there without changing the primary. And, if you want to drop another ~125 rpm, there is a 32 tooth front pulley available. Final drive ratio (34/57 primary & 32/66 drive pulleys) 3.46:1.
Increasing the cc doesn't lower the rpm, but it can sure get you to your cruise mph quicker!
SPOT ON.31/66 is a great combo option.i have really enjoyed riding my 883/1250 since i installed the front 31 tooth pulley.cruising at 70 is 3400.i will be going to the 66 rear soon for another 100 rpm drop.thx sirrom1 for all that u do :-)......also bike pulls better imo with this setup on my bike.was geared too low from factory.
 
Last edited by Iron Horse 13; 04-17-2020 at 10:27 AM.
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  #12  
Old 05-12-2024 | 10:28 PM
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OK, I know I am responding to an old thred BUT anyone know where to find a 31 tooth sprocket. Been on line for 2 hrs looking and can not find any................Thanks.
 
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  #13  
Old 05-13-2024 | 12:07 AM
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Originally Posted by perki48
OK, I know I am responding to an old thred BUT anyone know where to find a 31 tooth sprocket. Been on line for 2 hrs looking and can not find any................Thanks.
I bought my 31 front and 66 rear from sirrom1...shoot him a PM. Consider doing both...
 
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  #14  
Old 05-13-2024 | 06:32 AM
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Originally Posted by perki48
OK, I know I am responding to an old thred BUT anyone know where to find a 31 tooth sprocket. Been on line for 2 hrs looking and can not find any................Thanks.
I have no affiliation with this... I see one on Ebay.

https://www.ebay.com/itm/233973053987

hth,

T.
 
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  #15  
Old 05-13-2024 | 09:18 AM
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Originally Posted by WKNDS
I have no affiliation with this... I see one on Ebay.
https://www.ebay.com/itm/233973053987
hth,
T.
Yup...that is a Forum Member sirrom1 listing...

Also, here is a link to the various conversion charts from his website 883sportster.com:

https://www.883sportster.com/_files/...8aea0fb11d.pdf
 
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  #16  
Old 05-13-2024 | 11:36 AM
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Originally Posted by gerald martin
I am thinking of changing my belt sprockets on my 2005 883 low sportster. Has anyone done the 31tooth front sprocket and the 66 tooth rear sprocket? Will my bike have enough torque for this combo? Does anyone know what the rpms will be at 75 mph? I ride solo
The custom line also reflects a motor sprocket change to 38 teeth


 
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  #17  
Old 05-13-2024 | 11:42 AM
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Thanks everyone but I went ahead and ordered the 38 tooth primary sprocket and 96 link chain.
 
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  #18  
Old 05-13-2024 | 11:52 AM
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Originally Posted by Orng48
Yup...that is a Forum Member sirrom1 listing...

Also, here is a link to the various conversion charts from his website 883sportster.com:

https://www.883sportster.com/_files/...8aea0fb11d.pdf
I actually tried both his web site and his ebay listing prior to ordering the primary set up...............shows "out of stock" every place I went.
 
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  #19  
Old 05-13-2024 | 11:53 AM
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Originally Posted by perki48
Thanks everyone but I went ahead and ordered the 38 tooth primary sprocket and 96 link chain.
What it would look like if you added a 30 tooth trans pulley 40380-04 to it.


 
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  #20  
Old 05-15-2024 | 04:39 AM
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I’m on a gearing kick myself, going the other way, can’t stand the 1200 gearing with the 560 cams, way, way too tall.

Old lazy **** that I am, I use this handy screenshot from aswracing:




 
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