Length of Bagger Drive Belt

[turboprop]

I am seeing conflicting information regarding the length of bagger drive belts.

According to the Harley, OEM Parts finder, the '02-'07 baggers use a 139 tooth belt while the '08 baggers with the newer style swing arm use a 140 tooth belt.  Both era baggers have the same 32/70 pulleys.

This is where I have issue. I recently converted on of my FXRs to belt drive. TC five speed transmission, '08 swingarm, 32/70 pulleys. I sourced a 140 tooth belt (To align with the '08 arm). It is too long. The axle ends up rotated so far that the nut is too close to the shock, making it impossible to put a socket on either end of the axle.

Here is the confusing part. An ebay search, reveals many used belts that came off of these era of baggers with 137 teeth belts.

Just eyeballing the current 140 belt, it seems like 137 teeth would be the correct length.

Curious to hear from others that have counted the teeth on their baggers what is the correct length for a TC era bagger with oem 32/70 gearing?

[guydoc77]

Ed, I'm pretty sure my '08 RG  was 32/66 with a 137 tooth belt when stock.
I changed the trans pulley to 30 tooth and went one tooth less on the belt when I did that.
I will double check today when my Son who now owns that bike comes over. We just put a new belt on that thing last winter and I already forgot the specs 

Guy

[guydoc77]

So yeah, the one tooth shorter than stock belt we took off last year is 136 teeth.
Hope this is helpful.

Guy

[Ohio HD]

Yes the '07 and '08 baggers used a 66 tooth rear pully at the rear.

Do you know anyone near you that has an old rear belt that you can cut? Wrap it around the front pully and than around the rear pulley, and count any additional spaces that the belt doesn't cover. And I how many extra teeth if that's the case also.

[turboprop]

Hmmm. I assumed 32/70 but apparently not. My 32/70 on the '08 bagger arm is certainly out the norm. Being that the 140 is too long, am thinking a 138 or 137 would do it.

Still sort of confused by the tooth count listed on the Harley OEM Parts page as neither year group lists a 137.

[guydoc77]

The forums back then were/are replete with posts by guys asking about changing from the 66 tooth to the 70. I guess to get shorter legs out of 6th gear since 6th gear was all but useless on those bikes stock with the 66 tooth. I was doing  some calculating and came up with 137 but that is certainly not a solid recommendation.

I did find a site with a calculator though: https://www.rjc-choppers.nl/how-to-determine-your-belt-lenght/?srsltid=AfmBOooDzdBG16fL9l2ki6HwaQTgL1ejwYr_BQM91yk1G-dWzaMl9Zz8

[Ohio HD]

I can also tell you that when I added a 68 tooth to the rear replacing the 66 tooth, the OEM belt (137T) works fine. That's with the OEM 32T front.

I don't know, but wonder is the front pulley center to rear pulley center dimension the same on that FXR as it is with a bagger?

Here is the 2008 bagger OEM 137T belt, OEM #40024-07. Don't mind that price shown, that's in Aussie dollars.

[turboprop]

I can also tell you that when I added a 68 tooth to the rear replacing the 66 tooth, the OEM belt (137T) works fine. That's with the OEM 32T front.

I don't know, but wonder is the front pulley center to rear pulley center dimension the same on that FXR as it is with a bagger?

Here is the 2008 bagger OEM 137T belt, OEM #40024-07. Don't mind that price shown, that's in Aussie dollars.

The FRX aspect is irrelevant for this conversation as the trans case is from a five speed TC bagger.

After thinking about this some more, the setup is TC bagger trans case, 02-07 swingarm and 32/70 gearing. All of this is stock oem for the 02-07 baggers. The bike currently has a 140 tooth belt that I wrongfully selected. In my defense, I put this thing together about ten years ago and used a caliper from on '08 bagger. No manual for this and the details were/are somewhat hazy, but becoming clearer.

Bottom line, I will get a 139 tooth x 1" belt for an '02 - '07 bagger. This should be the end of it. Will wait a day or two before acting to give people some time to weigh in on this. 

[98fxstc]

Not sure if there is a difference in length between fxr swingarm and bagger swingarm but I reckon very likely there is a difference in distance from your front pulley to rear axle compared to stock 02-07 bagger.
Ohio's suggestion to get an old belt for a trial fit is a good one.

[Ohio HD]

Here's some belt size data for TC bikes in the mid years of 2006 to 2010. It may be helpful, I believe I got this here on HTT many years ago.

Also there used to be only one 1" belt in 139 tooth, and it was a BDL. I do know that the later model M8 touring uses a 139 tooth in 24mm width. And I imagine that belt has some strength to handle the M8 torque.
                        

part #	brand	teeth	width
40000036	HD	139	24mm
BDL-SPC-139-1	Belt Drives LTD	139	1 in

                        

[hrdtail78]

One thing that might be causing some problems.  The older swing arms had more movement for adjustment.  New bagger swingarms.  Not so much.  I have had to weld spacers in between the stop and cam lobe of adjuster in order to get a rear pully to move far enough back with out getting into the shock bolt while changing pully sizes.  I know this works if going from 32 to 31 on front w/ 70 on back.