The argument over the years is that a ratio is a ratio.Actually, if the gear ratio is the same, there is no mechanical advantage whether you have a 10 tooth or 15 tooth on the engine. 10/40, and 15/60 are both 4.0 – 1 ratio. Where's the mechanical advantage?
Wikipedia has a good explanation of what the term "mechanical advantage" means.
Now the argument has been made that bigger drivers and sprockets are better (sometimes), but that argument has been going on for years with no settlement insight. lolIn
There was a rule in place for years that limited the stocker guys on how low a rear gear we could use, that has changed.