Originally Posted by
Cpt.America
Finer control of gear ratios. Think of it as being able to go up half a tooth.
yup thats close enough to explain lol here is an example at the fine tuning 64 pitch allows.
72 spur 48 pitch / 96 spur 64 pitch
30 - 6.36 / 6.36 - 40
31 - 6.15 / 6.20 - 41
32 - 5.96 / 6.06 - 42
33 - 5.78 / 5.92 - 43