It is well documented that Tiagra 4700 is not compatible with other 10 speed parts, and uses a different set of ratios. But what are those ratios?
- What is the cable pull of a Tiagra 4700 10 speed shifter (
- What is the actuation ratio of a Tiagra 4700 rear derailleur (
The 4700 cassettes do appear to be compatible with other 10 speed components.
Shimano provide a compatibility chart, but that is only useful within the Shimano product line.
Here is my attempt.
Cable pull * Derailleur shift ratio = Cog pitch
- (Supposedly) 4700 uses 11-speed cable pull, which is
- The cog pitch for Shimano 10 speed cassettes is
2.7 * Derailleur shift ratio = 3.95
- And we get