My Nimbus Nightfox just arrived today. I put it all together and tried riding it. I was able to mount it right away even though it is my first 36" unicycle, but I can tell something is wrong. The frame and seat seems slightly twisted and off center. Not enough to show well in picture, but I can feel it. I plan on calling unicycle.com on Monday to ask about it. One of the metal tubes that I slide the frame over is oblong, so I feel like that may be a reason.
In the last photo it looks like the tire is off to the right and not centered on the frame. I would loosen one of the clamping screws and move the tire to the center of the frame.
As long as the tubes fit together I would not worry about the oblong tube.
How do I just move the tire to the center of the frame?
I should also mention that it was very difficult to get the frame on the metal tubing. Any small adjustments to the height will most likely be challenging.
Are the legs that extend out of the frame twisted at all? I had trouble aligning them on mine, but when I did the ride became smoother. Even if their just a little off center, it can make a huge difference.
If the top and bottom fork sections do not move freely, that could be a problem. On my Nightfox they move freely and if I loosen the clamping bolts I just push the tire to the center of the frame. Check with UDC.
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Loosen both “leg bolts”. That will provide “a lot of flex” in the frame, so that you can hold the saddle and “twist things around” until everything is straight. My son owns a Nightfox, when he left the U.S. to study abroad, I suddenly had an extra 36” in the form of a Nightfox to ride. When I lengthened the frame/fork legs the first time and clamped down the bolts, I was surprised to find that the wheel was not centered, and it was actually twisted off to the side a bit (the saddle and the wheel were not pointed in the exact same direction. The simple fix was loosening the leg bolts and giving the saddle a “little twist”, and then clamping the legs again. Similar to when you lengthen your saddle/seatpost, and then realize that the saddle doesn’t line up with your wheel any more. The fix for that is to loosen the seat post clamp, and twist the saddle back into position.
If you find that the camber of your wheel is off (one sidewall of the tire is closer to the frame than the other, you will likely need to loosen the bearing clamps just a bit so that you can wiggle the wheel a little, in order for the bearings to fully sit in the bearing wells/clamps properly. A tiny misadjustment there, results in a much larger discrepancy in the distance between tire sidewall and frame, when you are dealing with a 36” wheel.
If it’s an issue - and based on your statement that the leg doesn’t move freely in the frame I tend to think it is - I’d contact UDC. Or, head to my shop. Some gentle persuasion with the help of a vise should take care of the issue. Since it’s a part of a shiny new unicycle, I’d make sure to protect the leg with some wood blocks instead of clamping it directly in the vise.