Originally Posted by
Pinigis
How many unique gear ratios did you achieve? How many are more than 2% different from all the others?
Obviously, I do not plan to try out every possible combination at any given moment. Rather I will be setting a broad range with the chainrings, then a more refined range with BWR and the fine-tuned gear will come from the cogs. The overall range is 50/20 (rings) * 1.57/.64 (BWR) * 16/12 (cogs) = 8.18. The fine-tune ratio is about sqrt(16/12)=1.154. With this my effective number of gears is about log(8.18)/log(1.154)+1 =16. I.e. if you wanted to arrive at a similar choice of gears with a hub, you would go after 16 speeds.