Originally Posted by
dedhed
Tiagra 4700 is a total outlier that you have to wonder "What were they thinking?" at Shimano, especially since they now have 2 "Tiagra" 10 speed that don't mix & match
It's not a 'total outlier'. It's more like 'the first of a new series'. The 4700 FD and RD use the same ratio as the 11 speed road groupsets. The newer Sora R3000 and Claris R2000 also use the same new FD pull ratio as the 4700 and 11s drivetrains.