Ok I posted the forum an hour ago: Am I able to replace crankset?
it helps me to understand components in general better if I ask this:
First of all I'm not sure if the current shimano sora is a 8 or 9 speed but for now I"m going to consider it an 8 speed.
If I want to make the jump from an 8 speed bike (which let's assume has all sora components) to a 10 speed bike (by replacing with say, Shimano 105 components),
What are the LEAST components of my shimano sora I have to replace? If I switch to a 10 speed, do I have to replace only in my guess, the rear deraulier, cassette, and chain? OR do I have to replace ALL THE SORA COMPONENTS?
I hope it make sense.