WHP and Gear Ratio Changes

[fallenarch]

Has anyone dyno'd a 17T/45T ratio on an 09? I was wondering what the gearing change was worth horsepower wise.

[sixpack577]

Horsepower won't change. But I would think peak horsepower would be at a lower rpm.

[DevilDawg1]

Horsepower want change, the is a gearing calculator thread on here some where that will help you out.

I don't recall the thread, someone will help with this shortly.

[Commuta_Busa]

sprocket changes don't effect an engines hp or torque. The only thing that changes is the drive wheel torque or thrust which is calculated from flywheel torque, gear ratio, and drivetrain losses.

[CTK1]

I just changed my 2008 to 17 front and 45 rear and it's a different animal.
It was just what I was looking for.

[r1d3on3]

here ya go...

Gearing Commander: Motorcycle Gear Ratio Calculator for Sprockets RPM Speed Chain