Newbie Bike mechanic here! I just replaced the chain, chainrings and rear cassette on my bike, the new cassette and chain rings are the exact model that they replaced.
The trouble I’m having is with my front derailleur, a Shimano 105 10 sp. I can’t get the the chain not to touch the left side of the derailleur cage when in the largest gear in the back wheel or the right side of the derailleur cage when in the smallest gear in the back wheel. It seems like it could only be cause by the rear cassette being wider or the chain being wider or am I missing something? I'm not talking about moving from one front chainring to another this without any front chainring movement.
It doesn't look like the cage is bent and I even took the cassette apart to see that it wasn’t seated properly and also measured it to see that it looks to be the same width as the old one.
When I look at online videos they mention the chain being 1 or 2 mm from the cage. I can’t set it any better than barley touching both sides when on either end of the small and large rear gears.
The clearance is a little better in the larger chainring that the small chainring.
Any ideas?