UDC (US) has just started offering a Nimbus 29" Oracle Road LT". I’d like to add brakes but not sure which ones are better. For cranks, maybe 150mm. I want the 127/150 dual hole cranks but those are out of stock. I can free mount my 24" with 152mm cranks but not always. Hopefully I’ll be able to handle a 29" uni. I’ve been riding about 3-4 miles a day on paved trails and want to work up to 12 - 14 mile rides.
Based on my experience of building a 29 after riding a 24 for a while as a beginner I would say that 150’s are too long unless you are going to do a fair amount of XC with climbing. I ended up giving those 150’s to Jakob F after realizing I would never use them, and I haven’t regretted it once. 125’s are very manageable on a road 29 even for steep hills. 100’s are harder to push, but if you work up to it they really make the 29er a solid road going machine. I haven’t tried 114’s, but I would bet they are a good all around set of cranks for speed with control on a 29. I have to admit that sometimes I feel a bit out of control with the 102’s I have on my 29er. Even as a beginner I never felt out of control with 125’s though.
I am the poster in the thread referenced above, and I am happy to say that I have had many, many happy miles on my 29er Oracle with the Schwalbe Big Apple tire (2"), and went on to replace it with a new one after wearing the first one out. I ride it with some pretty high pressures (50psi) and found the road crown to be not too much a problem. I think the issue with the tire blowing off related to my inexperience with a Foss tube and my not having been careful to assess proper tire bead seating after the initial inflation of the tire before pumping up to higher pressures. I whole-heartedly recommend the Big Apple.
The Big Apple 29 x 2.0 tire I’ve got on a 42mm rim has not given me any trouble at all, whether at 25 psi or at slightly above the recommended maximum of 70 psi. I once rode an identical Nimbus road uni with a 2.35 Big Apple, and it was nice, too, giving a slightly larger wheel diameter and, I suppose, better possibilities for hopping, though someone told me the fatter tire would be one of those ones that on a cambered road would make me dance the Twist to go in a straight line. That’s not a huge problem on a 20, but on a 29, it would be very annoying.
To anyone that is looking for a good road tire for a wide 29er rim, I saw that Maxxis makes a 29x2.5 Hookworm. The Hookworm has an excellent track record among unicyclists and would be the tire IMO if you have a 42+mm tire.