What's the significance of using a smaller front sprocket? For example - I see for the 06-07 gsxr600s (not sure about 08) the stock gearing is 16/43 and many people recommend 15/45. My understanding is -1 in the front is equal to +2 in the rear (correct me if I'm wrong). So why not run 16/47? Gear ratios should be similar so is it just to maintain a satisfactory wheelbase (longer, shorter) and it's characteristics? What if you run 16/47 with a chain length that puts the wheelbase at the exact same length as 15/45? Now no difference whatsoever?