sprocket size
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1st Gear
Joined: May 2009
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From: redding, ca
sprocket size
I have an 84 softail with a 4 speed, when im doing 65mph my rpms are about 3,400. What size sprocket can i put on the rear to lower the rpms. The stock sprocket is a 51 tooth in rear and a 23 tooth sprocket in the frount. I would have to go smaller on the back sprocket but how much smaller can i go?
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Joined: Dec 2005
Posts: 5,443
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From: NC USA
I have an 84 softail with a 4 speed, when im doing 65mph my rpms are about 3,400. What size sprocket can i put on the rear to lower the rpms. The stock sprocket is a 51 tooth in rear and a 23 tooth sprocket in the frount. I would have to go smaller on the back sprocket but how much smaller can i go?
You can go up to 23 or 24 front, and down as far as 43 on the rear. Better to look thru the Shovelhead portions of catalogs when shopping. That'll give you more choices than the Evo sections since they're aimed more toward belt drives.
Here's a link to Baker transmission gearing page. You have to do some math though...
http://www.bakerdrivetrain.com/gearratios/index.htm
PS: they added a calculator at the bottom of the page, but you'll have to substitute your engine and clutch sprocket sizes since they only give example values for '85 up in the program - but it's pretty cool
Last edited by t150vej; Jan 8, 2010 at 07:19 AM. Reason: PS
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