Originally Posted by
fietsbob
and better for who , the sellers of the more expensive parts , certainly , they cost more ..
and do the math .. what gear ratios do you actually use ? say 14,15,16,17,18,19 will having 14~20 with only a 1 tooth difference between them matter?
or can you skip some?
I do whatever I needed to (13 starting cog, triple crank, ten cogs, whatever) to keep one tooth jumps to the 19.
A 20 cog between 19 and 21 is noticeable although I'd take a bigger final cog instead.
I find the 22 between 21 and 23 superfluous apart from providing a better chain line for the adjacent 21; although big cogs running 23 then 25 or 26 would do the same. OTOH Lance insisted on 21-22-23 final cogs for climbs like l'Alpe d'Huez, the Tourmalet, and Luz Ardiden.
13-21 was my favorite in the 8 cog era, 13-23 9 cogs, and I've been playing with a 10 cog 14-23 straight block although 12-23 (better chainline on flat ground with the 39 ring) or 13-26 would be better in many situations.