V-Twin Forum banner

1 - 6 of 6 Posts

·
Registered
Joined
·
304 Posts
Discussion Starter #1
Am I stupid or just missing something. I got the ratio from a Dyna spec at HD.com. Something don't look right. The first gear ratio on the Dyna (first column) is real close to the fifth gear ratio for the touring bike (second column).


Gear Ratio (overall)

1st 3.337 10.110

2nd 2.313 6.958

3rd 1.718 4.953

4th 1.391 3.862

5th 1.175 3.150

6th 1.000 N/A
:confused:
 

·
Registered
Joined
·
1,177 Posts
Just a misnomer on the web site. It should read "Final Drive Ratio", that is in reference to the transmission only and not the overall gear ratio.

In comparison, the touring bike final drive ratios are:
Touring - '06 Dyna
1st: 3.21 - 3.337
2nd: 2.21 - 2.313
3rd: 1.57 - 1.718
4th: 1.23 - 1.319
5th: 1.00 - 1.175
6th: n/a - 1.00



amidaeus said:
Am I stupid or just missing something. I got the ratio from a Dyna spec at HD.com. Something don't look right. The first gear ratio on the Dyna (first column) is real close to the fifth gear ratio for the touring bike (second column).


Gear Ratio (overall)

1st 3.337 10.110

2nd 2.313 6.958

3rd 1.718 4.953

4th 1.391 3.862

5th 1.175 3.150

6th 1.000 N/A
:confused:
 

·
Registered
Joined
·
304 Posts
Discussion Starter #3
Thanks... I knew something wasn't right.
 

·
Knower of Stuff
Joined
·
1,978 Posts
Keep in Mind that they also change the primary drive gear ratio from 1.44:1 to 1.353:1
This makes the Overall Gear Ratio the following
Gear 2006 2005
1st 9.878 10.110
2nd 6.846 6.958
3rd 5.085 4.953
4th 4.112 3.862
5th 3.478 3.15
6th 2.96 n/a

So even though 6th is 1:1 in the trans, you still get lower RPM at cruising speeds.
 

·
Registered
Joined
·
927 Posts
So basically they use a six speed to give the Dyna a little more pep on the low end while keeping the same top end, IMO. OTOH, one could always beef up the torque of one's motor and not have to shift 8% more...
 

·
Registered
Joined
·
575 Posts
Some Guy said:
So basically they use a six speed to give the Dyna a little more pep on the low end while keeping the same top end, IMO. OTOH, one could always beef up the torque of one's motor and not have to shift 8% more...
Actually, I think HD just emulated what Bert Baker accomplished with the first 6 speed. His intent was to lower engine rpms at speed to reduce vibrations ("No monkey butt", to quote Bert). HD is not blind to the aftermarket. When 6 speeds became popular, they took interest.
 
1 - 6 of 6 Posts
Top