My bike currently has an old 105 crankset. It's a 105 SC, from 1989. The rest of the components are Claris R2000.
I'd like to replace the crankset with a new one with smaller rings. I thought of the Claris FC-R2000, but that would require changing the bottom bracket too.
Then I saw the Claris FC-RS200 which requires a square bottom bracket, and thus should be a simple swap (and it has a 46-34T version too, which is nice).
But I've seen that I should be careful with the BB and axle measurement, which if too long, could make the new chainrings too far to the right and outside the front derailleur's range.
Considering that my current BB shell is 68mm wide, that my current 105SC cranks are flush with it and work quite well with my FD-R2000, can anyone confirm or not that a simple swap will work as it should?
Or should I remove my current cranks to measure the axle first?