I have a road bike that I use mostly for touring (2-3 day trips) and my daily commute (~25km). It's loaded with the
Shimano 2300 (2013) 3 X 10 groupset. I know it's not the most efficient or lightweight, but for my purposes it has served me well.
I just broke the rear derailleur. My policy is to always replace parts with ones of the same or better quality.
My problem is that 8-speed parts are becoming less and less common for road bikes, so buying better or equivalent parts for the 2300 is becoming difficult (I live in Singapore).
Is it worth it to upgrade to a complete higher tier groupset like the current Tiagra? My hope is that with this change I can access the market of 10 X 3 speed components and have room to upgrade part by part later if I want to.
Would I need to change more parts than the ones included (derailleurs, shifters, cassette, crankset, BB) other than the chain if my bicycle already handles 2300?