Hi Ferry,

I just measured the seatpost setback as 20mm (center to center), but it's hard to say precisely, it could be closer to 15mm. I attached a photo in case that helps.

I have not had any issues with the stem after replacing the bolts (definitely would not recommend the original bolts).

The seatpost itself has not slipped for me, while the seatpost head did rotate once when I hit a pothole (balltap!). I torqued it a bit more (6.5Nm I think) and it hasn't happened since. It comes with hardware for both common kinds of saddle rails.

Other than that, I've had zero issues with the r11 (it's my good weather road bike and it's winter here, so I've been spending more time on my cfr707 gravel and ragley hardtail), but perhaps next time I would go for a more standard setup with a round seatpost and regular stem+handlebar with external routing into the frame (like I have on my gravel bike and hardtail). I am a bit worried about the complexity of maintenance / availability of replacement parts for the custom parts.

I’m running 1x with full cable housing for the rear derailleur and hydraulic hoses, so I can’t comment on the front derailleur (I think some FD can accept full housing, but I’ve never installed one of those).

 I did have to slightly drill out the removable plastic cable stop at the head tube to run full housing for the RD. I noticed the BB area had a removable contraption with a cable stop for the FD, but I didn’t pay much attention. So, I guess my comment is kinda useless, sorry :-)

Sorry, I was talking about a different frame (CFR-707). It's just that I had the same issue, so I thought I'd mention the 51.8/51.9/52.00mm bearing sizes (I first thought that my frame was out of spec, but I decided the generic bearings were not suitable).

One more pic, out in the forest.

Regarding the original manufacturer, could it be https://www.yuananbike.com/product/yar-m14-mtb-hub-ratchet-system-center-lock-boost-axle-hub?

Thanks! I think your analysis is right it’s a glossy dark gray. They just call it rainbow paint. It’s $125. I really like it 

Those are 40mm wide, as measured. Clearance is 63mm at the pinch point AFAICT, so 50mm is definitely fine even with lots of mud :-)

Weights:

Frame size S, rainbow paint (including RD hanger, cable routing liners, bolts in every mount): 1274g
Fork painted & uncut (bolts in every mount): 562 g
Seatpost + head (350mm): 184 g