XMCS: 2026 Aero Gravel bike

[simon_swiss]

What type of headset is it? In one of the uploaded pictures I can see the bearing dimensions (40 x 51.8 x 8, 45/36).
Is it FSA or Deda DCR compatible? I'd like to run a two-piece cockpit, for example Deda Vinci DCR, with a slammed stem (or only with a minimal height adapter), as the stack of the size S frame is rather high.

What is the rear tire clearance with GRX Di2? It was asked before, but I can't see a reply. My goal would be to fit a 50mm tire. My current bike has 420mm chainstays, 74 deg seat tube, and there is 4-5mm of clearance left to the GRX Di2 FD with a 50mm Schwalbe G-ONE RX on 25mm IW rim (measures 49mm). So perhaps with the 425 mm chainstays of the GRT this could fit? Any thoughts on this?

[Requiem84]

FSA/ACR. 2x tire clearance not tested by anyone, but would expect around 50mm.

[edfungus]

Ran into a snag on size S frame/fork. I cut the fork slammed for only the 12mm headset and the expander plug is too long. There is a ridge on the inside before a not smooth section 40mm from the top. The plug is 50mm. I think if you have a 10mm spacer + the 12mm you will be fine. I'll have to go get a shorter expander plug. Shouldn't affect most except those slamming a size small

[LP119]

Ran into a snag on size S frame/fork. I cut the fork slammed for only the 12mm headset and the expander plug is too long. There is a ridge on the inside before a not smooth section 40mm from the top. The plug is 50mm. I think if you have a 10mm spacer + the 12mm you will be fine. I'll have to go get a shorter expander plug. Shouldn't affect most except those slamming a size small

The inside of the steerer tube looks rough Maybe it's the angle or something. I'm planning on slamming the stem so hopefully on my Medium I'll be able to use the provided expander plug. Have you check with XMCS is the ridge inside is normal?

[simon_swiss]

Ran into a snag on size S frame/fork. I cut the fork slammed for only the 12mm headset and the expander plug is too long. There is a ridge on the inside before a not smooth section 40mm from the top. The plug is 50mm. I think if you have a 10mm spacer + the 12mm you will be fine. I'll have to go get a shorter expander plug. Shouldn't affect most except those slamming a size small

Thanks for sharing this info @edfungus. I didn't had this surprise on the radar.

I wonder if the ridge can be filed off, I doubt this is structurally load bearing. Surely the expander plug should make contact on the upper straight part, not be stuck on a remnant of the ridge, so might be difficult with a file.
I checked an old fork, the non-smooth section starts roughly where the outer diameter is expanding.