OK, so I have a rough and ready road bike (Planet X London Road) that is not shifting right....
It is running:
Shimano Tiagra 4600 Shifters (3 x 10) but running it a 1x10 with one front chainring
Shimano Deore RD-M610 (RDM610SGSL) 10 Speed Derailleur
Shimano Tiagra 4700 10 speed rear cassette
It shifts through the first 7 gears without issue but uses all 10 clicks to get there. It does not reach up to the last/top 3 gears (even though it will when I move the derailleur manually by hand).
I have tried with another Tiagra road shifter and it produced the same results.
I have set up the high/low limit screws correctly, tightened the cable multiple times and set the jockey wheel height correctly. No difference.
I have connected a MTB 10 speed shimano thumb shifter and it goes through all 10 gears perfectly.
Any ideas? It is driving me quite mad!