I started building this bike, and I might have a problem with the bottom bracket. I bought a ZTTO BB86. I can push the non-drive side in without any problems, but I can't do the same on the drive side. After I push the drive side in, there are about 4 mm left that need to be threaded in. The problem is that I'm not sure whether I should use that much force. Is it normal to need significant force to thread the last 4 mm, or could there be something wrong?
I'm using a socket wrench to install it because I can't tighten it with the ZTTO tool that came with the bottom bracket. It feels like it's too tight, which makes me think something isn't right. I'm worried about how much force it will take when it gets closer to being fully tightened, that i might crack the frame.

most probably it looks worse on the picture than irl, because of how zoomed it is. if you can't feel the carbon deflect, if you dont see / feel any crack, if by using a coin and tapping it along the chain stay, it sounds the same, then i think you're fine.
I bought a supersix himod rim years ago that had pretty ugly damage because of a dropped chain. It's been fine.

I can't comment on the diagnosis but a few suggestions on how to prevent it. First of all chaincatcher is a must. They are cheap, light and work. Second is a chainstay protection. Some frames come with those but if not I always make one myself from a kydex sheet. You heat it up and shape on your chainstay. Stick it with a double sided tape and it looks neat like it was installed from the factory

I don't own these particular frames, but I do have a Lightcarbon gravel and a VB-268. Contrary to what some might believe, the VB frame is of noticeably higher quality in every aspect. However, I wouldn't recommend building it with a mechanical groupset, especially if you're using an integrated cockpit. It's possible, but it can be a major hassle. You'll likely end up with less precise shifting and other issues like tight or unbalanced steering.

Hello guys !
My shimano 105 mechanical front derailleur comes with a cable stopper . Should I run the hose all the way to derailleur and remove the frame cable stopper ?

Thank you !