Check my math on gear ratio
#1
Check my math on gear ratio
25t engine sprocket 36t clutch. 32t trans 70t rear = 3.15 final ratio
31t trans. = 3.25 final ratio
30t trans. = 3.36 final ratio
All this with my stock 5 speed. With .21 change on a 30 t anybody remember RPM @ 75 mph Not going to be much of a long distance bike anymore as I have a newer one for that. Just a hot rod.
Working on swing arm now but want to make sure I can always use a HD belt
Thanks.
Hopefully I can go with a 6 speed later
31t trans. = 3.25 final ratio
30t trans. = 3.36 final ratio
All this with my stock 5 speed. With .21 change on a 30 t anybody remember RPM @ 75 mph Not going to be much of a long distance bike anymore as I have a newer one for that. Just a hot rod.
Working on swing arm now but want to make sure I can always use a HD belt
Thanks.
Hopefully I can go with a 6 speed later
#2
the load on the belt goes way up when you gear down maybe 2 times what it was
MPH from final drive ratio
rpmX60
-------------------------------------------------
final drive ratio x tire revolutions per mile
5200 X 60
---------------------------------------
3.37 X 775.69 < revolutions per mile
312000
-------------
2614.08
= 119.35
MPH from final drive ratio
rpmX60
-------------------------------------------------
final drive ratio x tire revolutions per mile
5200 X 60
---------------------------------------
3.37 X 775.69 < revolutions per mile
312000
-------------
2614.08
= 119.35
Last edited by johnjzjz; 02-08-2016 at 12:14 PM.
#3
#4
anything making over 100 100 on the dyno we gun shots when we load the bike during testing one gear 4th only < the gun shots are the belt jumping over the pulley to another tooth
if you have never heard it before and after the change you dont hear it, your good to go, the ramp up speed of torque is at a different plane - its all in the mechanics of the parts and how they like each other i guess
my buell S2 thunder bolt has a copy of the motor we road raced with my son has one as well and his has a chain / mine has a belt < fibreglass reinforced kevlor - his is jerky at low engine speeds and much more in your hands in vibes - mine with the belt the harmonics are way less and more a rider with crazy power
have not broken a belt but i really dont go anyplace with it as i have a pile of machines, i am going to put it back on the road this year its been 3 since i drove it last
if you have never heard it before and after the change you dont hear it, your good to go, the ramp up speed of torque is at a different plane - its all in the mechanics of the parts and how they like each other i guess
my buell S2 thunder bolt has a copy of the motor we road raced with my son has one as well and his has a chain / mine has a belt < fibreglass reinforced kevlor - his is jerky at low engine speeds and much more in your hands in vibes - mine with the belt the harmonics are way less and more a rider with crazy power
have not broken a belt but i really dont go anyplace with it as i have a pile of machines, i am going to put it back on the road this year its been 3 since i drove it last
#5
#6
the load on the belt goes way up when you gear down maybe 2 times what it was
MPH from final drive ratio
rpmX60
-------------------------------------------------
final drive ratio x tire revolutions per mile
5200 X 60
---------------------------------------
3.37 X 775.69 < revolutions per mile
312000
-------------
2614.08
= 119.35
MPH from final drive ratio
rpmX60
-------------------------------------------------
final drive ratio x tire revolutions per mile
5200 X 60
---------------------------------------
3.37 X 775.69 < revolutions per mile
312000
-------------
2614.08
= 119.35
Not following your math for revolutions per mile.
A 1998 FLHTCUI uses a tire sized MT90B16, which has an overall diameter of 25.70". My calculation of revolutions per mile is: 784.75
What tire are you basing your calculations on?
#7
Thank for thinking of it.
Last edited by Bumpandrun; 02-08-2016 at 06:20 PM.
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#8
anything making over 100 100 on the dyno we gun shots when we load the bike during testing one gear 4th only < the gun shots are the belt jumping over the pulley to another tooth
if you have never heard it before and after the change you dont hear it, your good to go, the ramp up speed of torque is at a different plane - its all in the mechanics of the parts and how they like each other i guess
my buell S2 thunder bolt has a copy of the motor we road raced with my son has one as well and his has a chain / mine has a belt < fibreglass reinforced kevlor - his is jerky at low engine speeds and much more in your hands in vibes - mine with the belt the harmonics are way less and more a rider with crazy power
have not broken a belt but i really dont go anyplace with it as i have a pile of machines, i am going to put it back on the road this year its been 3 since i drove it last
if you have never heard it before and after the change you dont hear it, your good to go, the ramp up speed of torque is at a different plane - its all in the mechanics of the parts and how they like each other i guess
my buell S2 thunder bolt has a copy of the motor we road raced with my son has one as well and his has a chain / mine has a belt < fibreglass reinforced kevlor - his is jerky at low engine speeds and much more in your hands in vibes - mine with the belt the harmonics are way less and more a rider with crazy power
have not broken a belt but i really dont go anyplace with it as i have a pile of machines, i am going to put it back on the road this year its been 3 since i drove it last
#10
I'm running 3.36 with a Baker OD6, have had a Screamin Eagle side car belt on it for a long time. First engine was around 150 with the bumped up compression and noticed the primary chain stretched more than the belt. That belt is a tough son of a biiiiatch, don't do throttle whacks but it sees a lot of throttle roll ons.