I'm just mounting the GRX FD-RX400. In the manual it says "if using a full outer model, ensure..."

What does full outer model mean and should I do that? :)

A page from the Shimano GRX FD-RX400 mounting book


There's a variant of this FD that is intended for frames with no housing stop at all for the cable housing. It features a housing stop that's integral to the derailleur itself. That's what they're talking about. They chose a confusing name for it because there are frames that have a housing stop near the FD/BB area that some would call a full or uninterrupted housing.

  • Thanks! My frame (Specialized AWOL Evo) has a cable stop that I have been using since it was new just under the bottom bracket so it sticks up behind the seat post. Should I use that one or the one built in to the derailleur?
    – Ola
    Sep 22 '21 at 19:44
  • 1
    @Ola If I were making that choice I would be looking at what option gives the smoother run for the cable and what option seems to leave the housing less vulnerable to water or dirt ingress. If I thought it made no difference either way, I would go for the frame stop on principle (lighter, less friction, but both only by whatever tiny marginal amount). It probably won't make much difference either way on your bike. Sep 22 '21 at 20:15

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