Originally Posted by
gsa103
Older 9-speed MTB derailleurs can be shifted as 10-speed using older Shimano 10-speed STI shifters. Something like Ultegra 6700 with a 9-speed Deore or Deore XT rear-derailluer. Front derailleur is a bigger issue.
Stay far away from Tiagra 4700 if you want good cross-compatibility.
Tiagra 4700 is an odd-duck, it's 10-speed but uses 11-speed cable pull ratios.
thanks for that. I had no idea about the Tiagra 4700s. I've read about people using 9-speed Deore Shadow rear-derailluer with 10speed cassette and STI shifters so will add them to my parts list and look at front derailluers