Ratios
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Calculate ratios as "driven over driver" so a 72 tooth pulley being driven by a 24 tooth would be a 3:1 ratio a 72 driven by a 25 will be a 2.88:1 ratio....1:1 is direct drive as in 1 RPM from the motor is 1 RPM at the input shaft of the tranny.
You can dial in a variety of ratios and a higher ratio (the lower the first number in the ratio the higher the gearing) will reduce revs across the range and also slow down your giddy up from the lights. You can usually buy your set up with a choice of ratios but work out what your bike is running currently before choosing your parts. It is usually the crank pulley (the smaller of the two) that you have a choice of.
You can dial in a variety of ratios and a higher ratio (the lower the first number in the ratio the higher the gearing) will reduce revs across the range and also slow down your giddy up from the lights. You can usually buy your set up with a choice of ratios but work out what your bike is running currently before choosing your parts. It is usually the crank pulley (the smaller of the two) that you have a choice of.
Road Warrior
Joined: Oct 2011
Posts: 1,376
Likes: 36
From: Round Rock, TX
Calculate ratios as "driven over driver" so a 72 tooth pulley being driven by a 24 tooth would be a 3:1 ratio a 72 driven by a 25 will be a 2.88:1 ratio....1:1 is direct drive as in 1 RPM from the motor is 1 RPM at the input shaft of the tranny.
You can dial in a variety of ratios and a higher ratio (the lower the first number in the ratio the higher the gearing) will reduce revs across the range and also slow down your giddy up from the lights. You can usually buy your set up with a choice of ratios but work out what your bike is running currently before choosing your parts. It is usually the crank pulley (the smaller of the two) that you have a choice of.
You can dial in a variety of ratios and a higher ratio (the lower the first number in the ratio the higher the gearing) will reduce revs across the range and also slow down your giddy up from the lights. You can usually buy your set up with a choice of ratios but work out what your bike is running currently before choosing your parts. It is usually the crank pulley (the smaller of the two) that you have a choice of.
http://www.hotbikeweb.com/motorcycle...vetrain-basics
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ray2001
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Mar 4, 2012 09:04 PM
