Do they provide any spacer for the integrated handlebar ? The bearing system is NO.55R 1.5 ? I'm asking as I have Avian Canary Handlebar and I wish to use it. The frame has the UCI sticker ?
When I bought the R088, SPcycle did not offer an integrated bar. So it's frame only. The headset uses 2x 52cm bearings and comes with a C ring. This frame does not have a UCI sticker. If you have the proper spacers and headset cap, you can probably use your bars. I built mine with a separate bar and stem, mainly for ease of boxing (for flying) and I didn't want to deal with potential loose headset issues.
I didn't use the provide expander plug and I use this style of compression plug on all my bike, (type 2 expander):
https://www.aliexpress.us/item/3256806309182455.html--
A couple quick notes regarding this build. I felt like I was breaking into new "bike build" territory, especially using this bike with the ER9 groupset. I almost gave up on it due to complications with the battery placement inside the seat tube. Though I'm glad I found a workable solution and I actually prefer it over how Di2 is handled, since no drilling is necessary with the seat post. The ER9 battery stays snug and can still be removed using the string method.
Also during the build I had some non-frame related issues. I found out one of my carbon cranksets was defective (I already contacted the seller for a replacement), I accidentally cut my rear hydraulic cable too short, so I had to inadvertently switch to my 34cm bars to fit the hose length as opposed to the 38cm bars I was initially planning. Also UDH is new to me, I would seriously make sure the hanger is properly torqued before riding, because not many people bring an 8mm hex wrench.
Anyways, I built this frame just to have a more up-to-date road bike. Also there's potential to cut more weight on this bike, but my build is focused more on durability, price and practicality, while being reasonably lightweight. I'll post photos later today!