Originally Posted by
HillRider
Basically those Tiagra levers have given up some leverage and the Spyres were designed to work best with the older cable pull design.
There was an old post saying that
TRP Spyres and HY/RD are Super SLR - they are made for the new Shimano cable pull. My
Sora 3503 are the new Super SLR, and I am much happier with Juin Tech R1's despite the fact that they use a shorter pull to make them compatible with Campy and older Shimano levers.
Another evidence that TRP brakes are optimized for the new (longer) Shimano pull design is that there exist
short pull conversion arms for HY/RD.
Maybe Spyres are just what they are. For me they were lacking stopping power from the hoods.