Originally Posted by
riceowls
The chain was recently replaced. Not 100% sure of the derailer compatibility. Is there any information of what derailers are compatible with STI shifters? Again, it was changed by a tandem-mechanic who knows what he is doing but we all make mistakes.
Not aware of STI compatible microshift shifters, which model is that?
The Microshift R9 in the 3 X 9 version would be a swap for the Shimano 6503 shifters but bar end, downtube, and thumb versions are also available.