EVO All Evo Model Discussion

70 tooth vs 66 tooth rear pulley

Thread Tools
 
Search this Thread
 
  #1  
Old 04-18-2019, 09:01 AM
Crashone's Avatar
Crashone
Crashone is offline
Outstanding HDF Member
Thread Starter
Join Date: Jul 2014
Location: NC
Posts: 2,720
Received 241 Likes on 192 Posts
Default 70 tooth vs 66 tooth rear pulley

Going through the parts and pieces for the up coming work I'll be doing on my '96, my stock '96 pulley is 70 tooth and the stock '08 pulley is 66 tooth. Also the '96 is running a 136 tooth belt and the '08 is running a 137 tooth belt.
I'm thinking this is going to be better for the lower rpm running like in traffic and also lower rpm at highway speeds. Am I thinking this right? Thanks!
 
  #2  
Old 04-18-2019, 09:29 AM
Racepres's Avatar
Racepres
Racepres is offline
Seasoned HDF Member
Join Date: Jul 2014
Location: Cental, MI
Posts: 6,942
Received 2,054 Likes on 1,510 Posts
Default

Bigger rear the better in town, or Racing ... Smaller is for higher MPH per RPM... if ya got the Power to pull it...

Talkin Rear here... of course Front is Opposite...
 
  #3  
Old 04-18-2019, 10:40 AM
rizzo's Avatar
rizzo
rizzo is offline
Seasoned HDF Member
Join Date: Dec 2006
Location: Black Hills
Posts: 7,514
Likes: 0
Received 4,620 Likes on 2,094 Posts
Default

Take a ride on a bicycle and watch the effort it takes when you move through the gears and it will make more sense.
 
  #4  
Old 04-18-2019, 12:09 PM
Crashone's Avatar
Crashone
Crashone is offline
Outstanding HDF Member
Thread Starter
Join Date: Jul 2014
Location: NC
Posts: 2,720
Received 241 Likes on 192 Posts
Default

Originally Posted by rizzo
Take a ride on a bicycle and watch the effort it takes when you move through the gears and it will make more sense.
Would that be uphill or downhill?
 
  #5  
Old 04-18-2019, 12:50 PM
rizzo's Avatar
rizzo
rizzo is offline
Seasoned HDF Member
Join Date: Dec 2006
Location: Black Hills
Posts: 7,514
Likes: 0
Received 4,620 Likes on 2,094 Posts
Default

Your choice, flat ground would probably be best. You can play with the different chain rings and sprockets to get a feel for differences - it will be exaggerated but the principles apply - pick the combo of chain ring and sprocket that are the closest.
 
  #6  
Old 04-18-2019, 12:51 PM
kero's Avatar
kero
kero is offline
Tourer
Join Date: Sep 2018
Location: Sevilla, Spain
Posts: 291
Received 178 Likes on 88 Posts
Default

My 92 flhs has a 61T pulley. It's stock for international bikes. 40236-88A
 
  #7  
Old 04-18-2019, 12:54 PM
Crashone's Avatar
Crashone
Crashone is offline
Outstanding HDF Member
Thread Starter
Join Date: Jul 2014
Location: NC
Posts: 2,720
Received 241 Likes on 192 Posts
Default

Originally Posted by rizzo
Your choice, flat ground would probably be best. You can play with the different chain rings and sprockets to get a feel for differences - it will be exaggerated but the principles apply - pick the combo of chain ring and sprocket that are the closest.
I see your concept, but I don't ride a bicycle with gears. I guess I'll find out when I get this thing put together. Thanks for the information.
 
  #8  
Old 04-18-2019, 05:48 PM
1997bagger's Avatar
1997bagger
1997bagger is offline
Grand HDF Member
Join Date: Aug 2008
Location: Ohio
Posts: 4,899
Received 1,687 Likes on 852 Posts
Default

Going thru the Baker gearing calculator you will lose 157 RPM's at 65mph by installing the 66 rear pulley with rest of the Evo pulley's. It will work as planned but would still work on a power/torque increase to get best of both worlds if the Evo is stock.

https://bakerdrivetrain.com/pages/ca...e-rpm-vs-speed
 
  #9  
Old 04-18-2019, 06:15 PM
Crashone's Avatar
Crashone
Crashone is offline
Outstanding HDF Member
Thread Starter
Join Date: Jul 2014
Location: NC
Posts: 2,720
Received 241 Likes on 192 Posts
Default

Originally Posted by 1997bagger
Going thru the Baker gearing calculator you will lose 157 RPM's at 65mph by installing the 66 rear pulley with rest of the Evo pulley's. It will work as planned but would still work on a power/torque increase to get best of both worlds if the Evo is stock.

https://bakerdrivetrain.com/pages/ca...e-rpm-vs-speed
Thank you. I'm running an EV-13 cam and that's all that's been done to the motor as far as performance etc goes.
I need to swap out bearings and get new spacers to replace the ABS stuff that came on the '08. I'm getting a good list of stuff to buy to do this swap.
 
  #10  
Old 04-18-2019, 08:23 PM
1997bagger's Avatar
1997bagger
1997bagger is offline
Grand HDF Member
Join Date: Aug 2008
Location: Ohio
Posts: 4,899
Received 1,687 Likes on 852 Posts
Default

Originally Posted by Crashone
Thank you. I'm running an EV-13 cam and that's all that's been done to the motor as far as performance etc goes.
I need to swap out bearings and get new spacers to replace the ABS stuff that came on the '08. I'm getting a good list of stuff to buy to do this swap.
Think you will be ok with the EV13 and your direction, 65 mph will just be shy 2600 rpm.
 


Quick Reply: 70 tooth vs 66 tooth rear pulley



All times are GMT -5. The time now is 07:17 AM.