i have a 07 fxdse.. i have sert, dyno time, se big sucker, and vance and heins short shots.. the bike went well at first. maybe I'm used to it. but I'm a big guy 320lbs.. and the bike doesn't do well against others down bottom. but the bike rolls up top. i can get 123 out of 4th gear. but the lower gears just are not there. so do i gear it down? I'm looking for qtr mile times to come down.. i dont go on crazy long rides either, i got about 6000 on it this year.. i have no idea what i shoud do. i would appreciate advice thank you- jon from nh
I've been thinking about this same thing. I'm picking up my new SERK Annie in two days and with the wife and I on it we may need a bit more low end.
When I was in Hawaii this past August I rented a '07 Electra Glide stock with the 96" motor. Boy talk about 5th gear noise!!!!! It would make my Shovelhead sound quiet.
On that bike with us both on 1st gear was a bit too high. I had to slip the clutch a bit too much to get us going up some of the very steep coast streets.
Instead of changing out the rear drive sprocket, I'm thinking if someone makes a new motor sprocket that would drop a couple teeth, that be about right. This way with the motor sprocket it doesn't mess with your speedo, just increase the rev's prior to the trans.
I thought I read some place like maybe Baker had a sprocket without the compensator that would do the job. With the IDS rear drive it may not be that bad without the compensator, anybody know?

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I'm sure the self tensioner would have to and a manual tensioner or some way to convert a M-6 spring tensioner like I did on my '76 FLH.
Anyway, that's my 2ยข of worthless information.
Good luck and let us know what you did and how well it helped. I may still be doing something to my new SERK.