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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #1  
Old 12th January 2007
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whittlebeast whittlebeast is offline
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Default Gear charts for a Sportster

I posted a gear chart for a Sportster. It will work for any car or motorcycle up thru a 6 speed. The gear ratios "I think" are correct based on the numbers in my owners manual. I did not take a gearbox apart to count teeth on the gears to verify. The numbers in the yellow cells can be changed to anything you wish. Have fun.

http://www.ncs-stl.com/motorcycle/SportsterGearing.xls

AW

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  #2  
Old 12th January 2007
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Excellent piece of Excel magic! This is a great way to model potential driveline changes.
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  #3  
Old 12th January 2007
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Another piece of great info from the XLForum![IMG][/IMG]
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  #4  
Old 12th January 2007
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Quote:
Originally Posted by whittlebeast View Post
I posted a gear chart for a Sportster. It will work for any car or motorcycle up thru a 6 speed. The gear ratios "I think" are correct based on the numbers in my owners manual. I did not take a gearbox apart to count teeth on the gears to verify. The numbers in the yellow cells can be changed to anything you wish. Have fun.

http://www.ncs-stl.com/motorcycle/SportsterGearing.xls

AW

Interesting. It is ratio'd for a 1200 US.

I have been looking at this to modify it for ('05) 883 US gearing. I changed the primary ratio to 57/34 and the "Small Gear" from 29 to 28.

Are there other changes needed?

My manual expresses the overall gear rations differently... I haven't yet figured out how to correlate them with your ratios.

Overall Gear Ratios
Gear -- 883 US ---1200 US
1 -----10.944 ---- 9.454
2 ----- 7.524 ---- 6.5
3 ----- 5.834 ---- 5.04
4 ----- 4.806 ---- 4.152
5 ----- 4.071 ---- 3.517

Hints?

Gary
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  #5  
Old 13th January 2007
ncst8er ncst8er is offline
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The manual is showing the overall ratio which is the gear ratio x primary ratio x final ratio or for fifth gear: 1.0 x (57/34) x (68/28) = 4.071
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  #6  
Old 13th January 2007
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Just do it like this
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  #7  
Old 14th January 2007
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thanks for the tip, Whittlebeast.

Gary
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  #8  
Old 14th January 2007
decman decman is offline
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The ratio for a Baker 6th gear is 0.86
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