Increased Torque through Reduced Gearing.

[grbrown]

I have commented on a number of occasions here on HDH that changing the high factory gearing on Harleys is a cheap way of improving performance. I have a SE 21T compensator (crankshaft) sprocket kit on my Dyna, which substantially reduces gearing (down from 25T) and gives a worthwhile improvement in performance. I have recently discovered that Baker, of gearbox fame, make alternative sprockets, but explain the benefits in interesting terms. Read more on their website here.

What my change gives is a 19% increase in torque at the rear wheel! Consider what tuning is needed to achieve the same benefit.

[simonDyna]

And if you really want to play with sprocket teeth numbers, here is an easy way to see the differences.

[Kiwi]

Originally Posted by grbrown

What my change gives is a 19% increase in torque at the rear wheel! Consider what tuning is needed to achieve the same benefit.

simple mathematics along with a 19% increase in noise and vibration which is why harley over gear the bikes in the first place to sneak thru the emission testing