2006+ Chain Drive
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Joined: Feb 2017
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From: UTAH
2006+ Chain Drive
Wondering what you all recommend for chain drive sprocket size. I've heard that 25/55 is good for all around gearing with the 6 speed. Half my riding is freeway around 80mph but I want some torque in 1st and 2nd to help get the front end up. Anyone have more experience with chain drive?
Cruiser
Joined: Feb 2018
Posts: 200
Likes: 35
From: United States
I'm running a 530 o-ring chain and sprockets on My 89 FXR,2001 FXDX Sport and 2003 FXDL Anniversary Dyna . Go to a 23 Tooth Countershaft
(Transmission ) Sprocket and a 48 Tooth REAR Sprocket . Zippers Performance has complete kits with spacers and all hardware .
(Transmission ) Sprocket and a 48 Tooth REAR Sprocket . Zippers Performance has complete kits with spacers and all hardware .
OP- Your selection of 25/55 gearing would be a great choice to have a bit more "low end" torque available with still not being too high revving at 80mph, but maybe 25/54 woud be a touch better if you can find the sprocket. you can also get the same gearing from a 30t drive pulley if you stay with belt drive and stock 66t rear pulley. There is also a few members running the 30/66 combo as well.
I went from the stock 32/66 pulley to a 32/68 setup and Its perfect. I run 80mph quite frequently and its around 3000-3100 engine RPM in 6th gear. Not an extreme jump but definitely a noticeable help in the lower rpm torque delivery and the bike runs much better in 6th gear as I can actually use 6th gear at 70mph and not be lugging the bike.
here are some quick calcs about the ratios mentioned in my post so you can get an idea of what gear ratio you're looking at/ for. Listed from tallest to lowest gearing. Top of the list has least torque, bottom has more.
Stock dyna (32/66) 2.06:1
23/48 chain drive 2.08:1
My dyna (32/68) 2.125:1
25/55 chain drive 2.2:1
30t pulley/stock rear 2.2:1
Last edited by 2500hdon37s; Feb 27, 2018 at 11:05 AM.
Cruiser
Joined: Feb 2018
Posts: 200
Likes: 35
From: United States
23/48 is pretty much stock gearing for a 6spd bike. Which in all honesty is too tall and made for high speed running like 85-90 in 6th gear.
OP- Your selection of 25/55 gearing would be a great choice to have a bit more "low end" torque available with still not being too high revving at 80mph, but maybe 25/54 woud be a touch better if you can find the sprocket. you can also get the same gearing from a 30t drive pulley if you stay with belt drive and stock 66t rear pulley. There is also a few members running the 30/66 combo as well.
I went from the stock 32/66 pulley to a 32/68 setup and Its perfect. I run 80mph quite frequently and its around 3000-3100 engine RPM in 6th gear. Not an extreme jump but definitely a noticeable help in the lower rpm torque delivery and the bike runs much better in 6th gear as I can actually use 6th gear at 70mph and not be lugging the bike.
here are some quick calcs about the ratios mentioned in my post so you can get an idea of what gear ratio you're looking at/ for. Listed from tallest to lowest gearing. Top of the list has least torque, bottom has more.
Stock dyna (32/66) 2.06:1
23/48 chain drive 2.08:1
My dyna (32/68) 2.125:1
25/55 chain drive 2.2:1
30t pulley/stock rear 2.2:1
OP- Your selection of 25/55 gearing would be a great choice to have a bit more "low end" torque available with still not being too high revving at 80mph, but maybe 25/54 woud be a touch better if you can find the sprocket. you can also get the same gearing from a 30t drive pulley if you stay with belt drive and stock 66t rear pulley. There is also a few members running the 30/66 combo as well.
I went from the stock 32/66 pulley to a 32/68 setup and Its perfect. I run 80mph quite frequently and its around 3000-3100 engine RPM in 6th gear. Not an extreme jump but definitely a noticeable help in the lower rpm torque delivery and the bike runs much better in 6th gear as I can actually use 6th gear at 70mph and not be lugging the bike.
here are some quick calcs about the ratios mentioned in my post so you can get an idea of what gear ratio you're looking at/ for. Listed from tallest to lowest gearing. Top of the list has least torque, bottom has more.
Stock dyna (32/66) 2.06:1
23/48 chain drive 2.08:1
My dyna (32/68) 2.125:1
25/55 chain drive 2.2:1
30t pulley/stock rear 2.2:1
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