I'm looking at a 2019 Giant TCX Advanced Pro 2 which was sold as a 1x. I have a Shimano 2x groupset laying around and would love this bike as a 2x.

Based on this image from this sold listing, it looks like there's a spare entry into the downtube:

Photograph of Giant TCX Advanced Pro 2 Cyclocross Bike - 2019, Small

And this review shows a hole behind the seat tube above the BB:

Photograph of Giant TCX Advanced Pro 2

Are my eyes decieving me or could I run gear cable down that and into a front derailleur?

  • There does seem to be a rubber plug on the right hand side of the seat tube - it may cover some tapped holes for a braze-on mount. You might try contacting Giant, or find a user/service manual for this frame.
    – Criggie
    Dec 3, 2020 at 21:14
  • Is there any penetration or hole on the bottom of the bottom bracket area where you could feed a cable through? That would align with the standard cable guide bolted to the bottom bracket of bikes that have a front derailleur? Is the seat tube perfectly round in the area where a derailleur mounting band would go? Is the seat tube the right size in that area so a derailleur mount would fit properly? If not, and this would be all-internal routing, how would you feed a shift cable through the frame? Dec 3, 2020 at 22:06
  • There is also an unused exit hole closer to the head tube. Seems like this frame is not 1×-specific. Dec 3, 2020 at 22:20

1 Answer 1


Response finally came through from Giant:

Yes, you should be able to route cable for a front derailleur.

  • Great find - thank you for coming back with a verified answer from an authorative source.
    – Criggie
    Dec 15, 2020 at 3:24

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