The BB can be installed without a bearing press. I have a bearing press but I didn't end up using it.Few things:
The drive side (DS) and none drive side (NDS) press fit interface have different outer diameter (OD).
- NDS: slightly larger OD, very tight pressed fit with the frame BB shell.
- DS: slightly smaller OD, slightly looser fit with the frame BB shell.
What that means:
- NDS: can only be fitted into the BB shell by going in straight.
- DS: looser fit with clearance allow it to slide in by just threading in.What I did on my R3 MUD:
1. apply teflon on press fit interface
2. apply grease, or thread lube, on BB cup threads
3. press in the DS BB cup first, the looser fit makes it easy to slide in without a press.
4. place the NDS BB cup on the frame (in my case NDS BB cup bumped against the DS BB cup first before the press fit interface comes to contact with the carbon BB shell. Your frame may have different tolerance)
5. rotate the NDS BB cup, and thread into the DS BB cup thread
6. stop threading the NDS once it comes in contact with the carbon BB shell, I was able to get at least 1 full rotation of engagement.
7. rotate the DS BB cup and draw the NDS BB cup in.
8. once the NDS BB cup is mostly seated, light tap the NDS BB cup inward to make sure it really is fully seated
9. apply final torque on the DS BB cup. 35~50 Nm approx.
I was pretty careful through out this process and I don't see a problem with what I've done. I haven't put a lot of miles on this bike yet though, but some short rides, sprints, feels solid.
Someone please let me know if I screwed something up here