Quote Originally Posted by Nessism View Post
What goals would drive someone to want to smaller and less efficient front sprocket?
One would be wanting larger gearing changes than can be accomplished with a tooth or two on the rear while not ending up with large changes in chain length. Most modern sport bikes (from early 2000's up) come with very tall gearing that is fine for sedate highway riding but is way too tall for optimal track use. For track use a common gearing change is -1F/+3R. This keeps the chain length pretty reasonable, doesn't alter the anti-squat effect too much and keeps the wheel in the middle of the adjustment range on the swingarm.