Gears Ratio Info

[macmac]

One O' you mugs sent me a pm wanting tranny gears ratios to compare to a Hardly

I sat about doing boring math and came up with these figures. The hardly figures were plain given to me.

Gear Ratios
—1st 2.50 = 10.29 :1
—2nd 1.59 = 6.317
—3rd 1.192 = 4.736
—4th 0.965 = 3.83
—5th 0.781 = 3.105
..............................................
Harley gives:
Overall Ratio:
1st 10.110 :1
2nd 6.958
3rd 4.953
4th 3.862
5th 3.150

Just figured someone else would have asked sooner or later.

[AlabamaNomadRider]

It wouldn't have been me asking. After seeing the ratios I know so much more now Mac. If you multiply 0 X 0 you have zero. That is exactly how much I knew before and know now.

Actually I do know some but not enough to even be dangerous. I am sure there are some that might need the information.

The only ratio I know about is a 4-11 rear end in the cars of the 60s and 70s. I know they were pretty fast off the line. Gas mileage was pretty $hitty though.

[macmac]

In the book there is 2 ratios to multiply plus the gear ratios given for the final answers. I just made it easy I hope, and hope I didn't make any error, but I don't think I did.

[ringadingh]

From riding with a couple of my pals who ride HD's, I know that they are very close. We shift at almost the same time, and the bikes seem to pull about the same under normal riding.
Your results seem to prove what Ive always figured.

[mikeyger]

I am with you Alabama rider!

[jandreu]

Heres a handy program that gives you the gear ratios as well as other usefull info;

http://gadgetjq.com/vulcan_speed_rpmcheck.htm

[macmac]

bump. This might be handy for some recent tranny questions/loss of power etc.

[ringadingh]

The only thing though, is you can't change any of it. It is what it is.

[blowndodge]

After installing my 27" truck tire my RPM's are within 80 rpms of a six speed Harley in top gear. I couldn't use a 6th gear unless I had a tail wind all the time..

[macmac]

Well tires can change it the cheapest. Then gobs of money can change anything..... I never had that problem, but I would like to try someday

[Sin City Stan]

Originally Posted by Blowndodge "Darksider"

After installing my 27" truck tire my RPM's are within 80 rpms of a six speed Harley in top gear. I couldn't use a 6th gear unless I had a tail wind all the time..

Sure you could. This is the USA. More is always better. I have a 26.3" tall tire tire and use 6th all the time and have a lower final output than the 1600. Anyway you do the math I turn less RPM than you at any speed. I don't have that much more torque.

I turn 2800 RPM @ 80 MPH
1700 vs 1600 final output ratio: 2.7 vs. 3.1

[blowndodge]

I'm turning 3090 at 80... 2700 at 70. Thats still pretty low rpms..

[macmac]

Well with enough money we can all turn 14,000 engine rpm's right?

[Sin City Stan]

Originally Posted by macmac

Well with enough money we can all turn 14,000 engine rpm's right?

With enough money maybe we could . . . but I think I would want some sort of explosion blanket around it other than my legs.

[macmac]

The paint comes first, as skin heals.