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[North Star]

Possibly... I had originally set the correction factor from original incorrectly.... I used tire size from the CUSE (it was the default size in the drop down menu and I missed it)

The correction factor is posted elsewhere in this thread. I havent tried the GPS on my phone to validate speed... 
Though I did have some clear road today so I rolled into it in 6th...
3K = ~74 MPH
3.5K = ~86 MPH
Will look for a little more road with space to try 4K....  98 MPH?

So numbers aside, do you like the mod, or do you feel that it is revving too high at highway speeds? As you can see, I'm debating between 30T and 31T, what are your thoughts?

[North Star]

Here is a good info page from Andrews- not sure if this was already posted- this is a long thread.


http://www.andrewsproducts.com/PDF_files/catalog/29_BeltPulleys-pg29.pdf

Pulleys: 2007 - 2011 Baggers
Final Drive Ratio (’07 & ’08) = 2.79 with stk 32 T pulley
Final Drive Ratio (’07 & ’08) = 2.97 with AP 30 T pulley
Final Drive Ratio (’09 & ’11) = 2.87 with stk HD 32T pulley
Final Drive Ratio (’09 & ’11) = 2.97 with AP 31T pulley (OK w/stock belt)


Interesting that dropping down two teeth in an 07-08 model (30T), gives you the same final drive ratio as dropping down one tooth (31T) in a 09-11 model (which is 2.97).

[HOGMIKE]

So numbers aside, do you like the mod, or do you feel that it is revving too high at highway speeds? As you can see, I'm debating between 30T and 31T, what are your thoughts?

Looking at what you posted as your build (basically stock, right?)
Question is, what speed do you usually ride? There would be a deciding factor IMO from a 30 to 31 depending on your cruising speed.
Example:
Out here, I cruise the freeways at 75-85 most of the time, and with my build the 30T is perfect. I tow a trailer on long trips, thus the 30T
I can get to 100 pretty quick (closed course!) but don't go there often. My bike is at 100HP and 100TQ.
Just food for thought.

[North Star]

Looking at what you posted as your build (basically stock, right?)
Question is, what speed do you usually ride? There would be a deciding factor IMO from a 30 to 31 depending on your cruising speed.
Example:
Out here, I cruise the freeways at 75-85 most of the time, and with my build the 30T is perfect. I tow a trailer on long trips, thus the 30T
I can get to 100 pretty quick (closed course!) but don't go there often. My bike is at 100HP and 100TQ.
Just food for thought.

Same with me- Avg indicated highway speed I do with the inaccurate stock speedo is 75-80 mph. I only occasionally commute to work on the highway, as riding Highway 401 up here is not enjoyable at all, so I don't do it daily. I'm basing all this on the question, "what would the bike be like on a long highway trip with the gear change?".

I just talked to Andrews to get their opinion, and to see about the stock belt use on a 31T. Very helpful and talkative guy, didn't help make up my mind on either pulley, but told me that the bike may or may not be able to use the stock belt on a 31T, depending on how much room there is for adjustment.

[2018_FLTRXSE]

So numbers aside, do you like the mod, or do you feel that it is revving too high at highway speeds? As you can see, I'm debating between 30T and 31T, what are your thoughts?

I dont have a lot of interstate.. in fact... NO interstate... 3 freeways, no speed limits over 60... but speeds "tolerated" up to 65-70

However... I do cruise a lot at ~70... and just under 3K is perfect. When you want to pass slow moving traffic its GREAT... no downshift.. just roll into it....

[Rooster]

I was thinking in 09 the rear belt pulley is 2 teeth different than 07-08. Making the 07-08 seem a little higher geared. So the 30T would be even better in an 07-08. I think I am confused now.

[North Star]

Well, that's the thing- a 30T in a 07-08 model puts the final drive ration at 2.97, which is where I would be with a 31T in a 2009 :

Pulleys: 2007 - 2011 Baggers
Final Drive Ratio (’07 & ’08) = 2.79 with stk 32 T pulley
Final Drive Ratio (’07 & ’08) = 2.97 with AP 30 T pulley
Final Drive Ratio (’09 & ’11) = 2.87 with stk HD 32T pulley
Final Drive Ratio (’09 & ’11) = 2.97 with 31T pulley (OK w/stock belt)

So, since it sounds like 07-08 owners are thrilled with their 30T's, it doesn't make sense that some would say a 31T in mine wouldn't make a noticable difference, and would only be a little increase in performance.  

Where are you Steve, help me out- you had both the 30T and 31T on your bike???

[Half_Crazy]

it doesn't make sense that some would say a 31T in mine wouldn't make a noticable difference, and would only be a little increase in performance

One tooth isn't really a big change. It's no simple task to change the pulley on a Harley.

Going from 32 to 30 is like 6.5% change in gearing.
For you to go from 32 to 31 is only like 3.5% change in gearing.

I would say that unless you really feel your geaing is too high, it won't be worth it. Maybe spend the money on making more torque?

I did 7% change (2 teeth) on mine and at 70 mph it turns 175 more RPM... so if I had only gone one tooth it would have only gained 87 rpm... I mean I can change the pulley in 20 minutes... but I'm not sure it would have been worth the $330 and the aggrevation for such a small change in overall gearing.

.

   

[Robmay]

One tooth isn't really a big change. It's no simple task to change the pulley on a Harley.

Going from 32 to 30 is like 6.5% change in gearing.
For you to go from 32 to 31 is only like 3.5% change in gearing.

I would say that unless you really feel your geaing is too high, it won't be worth it. Maybe spend the money on making more torque?

I did 7% change (2 teeth) on mine and at 70 mph it turns 175 more RPM... so if I had only gone one tooth it would have only gained 87 rpm... I mean I can change the pulley in 20 minutes... but I'm not sure it would have been worth the $330 and the aggrevation for such a small change in overall gearing.

.

   

I totally agree.

[FAST380]

Where are you Steve, help me out- you had both the 30T and 31T on your bike???

And there you go, he started with a 31 and switched to a 30 because he wanted a little more low end. As I remember his story, he rode 5th gear in the wind all day bacause his bike wouldn't pull 6th.

As for the stock belt working with the 31 tooth pulley: people are putting a 30 tooth (-2 teeth) with a 139 tooth belt (-1 tooth). My point would be that they are gaining +1 tooth on the belt when all said and done, the same as droping the front one tooth with the stock belt.

[FAST380]

So why are people going to a 139 belt instead of a 138 belt if they are dropping from a 32 to a 30??

[Chilly]

     It has to do with the distance of travel around the pulley set up, that's what determines which belt you use. Even thou you changed from a 32T to a 30T
     you didn't change the diameter of the pulley enough to drop 2 teeth on drive belt.   Chilly

[moscooter]

 

"--------------------------------------------------------------------------------
So why are people going to a 139 belt instead of a 138 belt if they are dropping from a 32 to a 30??"

From your comments,  it seems you may have the mistaken belief that the number of teeth in the belt firgures into the gearing chgs and/or ratios.

It does not!

The reason for going from the stock belt down to a 139T belt is due to the (adjustment and tension) in the belt.  Trying to use the stock belt and a two tooth smaller trans sprocket doesn't work because there is limited adjustment in the swing arm.

[rayson56]

FWIW   I recalibrated my speedo yesterday after doing the 30T with my TTS. The new calibration said to use 2251 as the new #. I added 50 points to that as recommended By Steve George and checked with GPS. I am now within 1 mph @ 70. Close enough for me! Thanks again everyone for your input. Kelly

[ruiner73]

FWIW   I recalibrated my speedo yesterday after doing the 30T with my TTS. The new calibration said to use 2251 as the new #. I added 50 points to that as recommended By Steve George and checked with GPS. I am now within 1 mph @ 70. Close enough for me! Thanks again everyone for your input. Kelly

OK, I hope this isn't a dumb question, I've got the TTS, but I've never used it personally, always done at the dealer. I'm scheduled to go in for the 30T in a week and a half, when you said "The new calibration said to use 2251 as the new #. I added 50 points to that", does that mean the value needed was 2301?
Again, I hope this wasn't a dumb question, I haven't talked to the tech at the dealer yet to go over calibration, just want to get all my info first.
Thanks