Originally Posted by
VegasJen
So based on just a cursory review of this link, the difference between Sora, Tiagra and Claris is the number of speeds? Is that correct?
That is
one difference, but there are way too many differences between groups and generations of said groups to break it down to number of gears/speeds.
it's complicated, but in general the higher "up" the line, the quality and cost go up.