2008 Dyna Rear Sprocket Conversion 70-Tooth
Road Warrior
Joined: Nov 2008
Posts: 1,789
Likes: 9
From: Double Oak, Texas
My bike is going in later this week for some new Bob Wood cams & valve springs and at the same time re-gearing. Going 2 less teeth in front and 2 more on the rear, keeping the same belt. Will post a dyno sheet when I get it back.
Banned
Joined: Sep 2009
Posts: 240
Likes: 0
Harley?
I assume it is an inch pulley
Road Warrior
Joined: Nov 2008
Posts: 1,789
Likes: 9
From: Double Oak, Texas
My HD shop had one in stock, yes they said it was a 1" HD sprocket ..... I think produced in '06. I'll get the part #'s when I take the bike in.
Road Warrior
Joined: Nov 2008
Posts: 1,789
Likes: 9
From: Double Oak, Texas
Got the idea direct from Bob Wood, when I ordered a set of his cams a few weeks ago from his online-shop in Alabama. He had the gear ratio in his head that the minus 2 front and plus 2 rear sprocket would give to a current dyna 6 speed. The man is a walking encyclopedia for all things cams, and engines in general. The speedo error the gearing change will induce is to be corrected by a speedo-healer or similar device. I like my speedo and odo reading correctly.
Banned
Joined: Sep 2009
Posts: 240
Likes: 0
I am using TTS so speedo correction is easy
I have already adjusted for the 30T front I am using, and seems very accurate
I am quite happy with the current set-up, but would certainly consider going lower, just not higher again
I assume that the extra belt slack given by the 30T front makes it possible to fit the 70 T rear
Guess we will soon know
What tuner are you using?
I have already adjusted for the 30T front I am using, and seems very accurate
I am quite happy with the current set-up, but would certainly consider going lower, just not higher again
I assume that the extra belt slack given by the 30T front makes it possible to fit the 70 T rear
Guess we will soon know
What tuner are you using?
Road Warrior
Joined: Nov 2008
Posts: 1,789
Likes: 9
From: Double Oak, Texas
I am using TTS so speedo correction is easy
I have already adjusted for the 30T front I am using, and seems very accurate
I am quite happy with the current set-up, but would certainly consider going lower, just not higher again
I assume that the extra belt slack given by the 30T front makes it possible to fit the 70 T rear
Guess we will soon know
What tuner are you using?
I have already adjusted for the 30T front I am using, and seems very accurate
I am quite happy with the current set-up, but would certainly consider going lower, just not higher again
I assume that the extra belt slack given by the 30T front makes it possible to fit the 70 T rear
Guess we will soon know
What tuner are you using?
The front 30 tooth sprocket is an Andrews for 6 speed trannys
Andrews #290306
The rear sprocket Harley part # 40576-06, black 70 tooth. 70 tooth ?!?!?HMMMMMM, I had specified a 68 tooth, oh, well the 70 tooth will give it an even lower final
drive, so it should be cleaning the rubber off the tread just a little more ... gotta do my part with the economy and all.
Needed a rear axle spacer for it as well #40947-06.
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Go to http://www.nightrider.com/biketech/calc_gearratios.htm and you can compute what each gear change will do, or use their standard calculation.