Convert 2019 Giant TCX Advanced Pro 2 1x to 2x

Question

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:

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

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, Commented 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? — Andrew Henle, Commented 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. — Grigory Rechistov, Commented Dec 3, 2020 at 22:20

user54044 · Accepted Answer · 2020-12-15 03:08:29Z

2

Response finally came through from Giant:

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

answered Dec 15, 2020 at 3:08

user54044

313 bronze badges

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

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