Thought I’d share some information about some Nimbus frames I have. Might be a useful reference for someone.
Nimbus II 20 inch frame with clamp-994 g
Chromoly seat post (300mm)- 403 g after I cut about 2 inches off. 361 g
Total weight- 1355 g
Nimbus X 20 frame (300mm) with clamp- 1069 g
chrome steel post (200mm)-325 g after cutting off about 2 inches- 225 g
Total weight- 1294 g
Weights are very similar. Both frames are very nice. For my riding I really like the X frame. It is much easier for me to get my foot on the frame, for those types of tricks. I would often hit the inside of my knee with the nimbus II frame, during unispins. Because the X frame is lower, I still hit but it tends to hit my guards instead of my flesh.
Obviously, the Nimbus II has an edge over the X in the Trials department, because the seat height is more adjustable.
Both frames in combination with these seatposts are very strong. The X frame might feel a little stiffer (very hard to tell).
FYI the aluminum 300mm 25.4 mm seatpost is 287 g.
Here is a pic of my modified uni. I started with a stock Nimbus trials ISIS. So far I’ve broke the stock cranks (bent), couple of spokes, seatpost and seat and it has evolved into this. CF seatbase will be here shortly.
I think they should revise the longneck to take 25.4mm (atleast) seatposts. Only then would I consider it as my Thomson post wouldn’t fit. Looks like you’ve got a pretty sweet ride though. You said it looks good from a distance… how about close up?
You will need to be creative about how you space the bearings so the spokes do not rub the frame. I noticed my Moment hub fit in my free-tricks frame much better after the flanges had been bent in a bit from ridding.