And in particular: “Shimano GRX 400 components work great with the 10-speed Tiagra road groupset”. It turns out that’s not the whole story: GRX is compatible only if your existing parts didn’t exist ...

In short: if I were building a new tourer and wanted STI-style shifters on drop bars, should I buy Shimano, or Sram, or perhaps even Campagnolo? We haven’t seen a drop bar touring groupset since the ...