Originally Posted by
people_atease
Btw when my bike chain is on front chainwheel biggest and rear chainwheel biggest the chain is kind of touching the side of the FD, is it normal? I am using a 9speed sora. (like the tail too far outward chain touching the side)
That's the "large/large" chain combination, you should never use it. You get the same ratio with the small chainring and one of the medium cogs. Most modern bikes are not intended to ever be shifted into that combination. (The 10speed cassettes have even more restrictions like that as I understand)