The frame design is basically as same as T line, but instead of Ti, the main material is Al.
So it is of course much more affordable. One unexpected surprise is that the ride is actually stiffer.

Durability still needs to be further verified. It's been one year since I built it and so far no issues.

From your pictures, it seems to me that the main tube diameter is smaller than on the T-line, did you measure it?

Due to this tube diameter increase (main tube and also stem), the T-line is also stiffer than the classic steel 16" Brompton.

What does it weigh?

No detailed measurement yet. But it looks smaller, yes.


I feel the steel c-line is stiffer than t-line, which is different from your conclusion.

It is 8.5 kg.
I have a normal steel Brompton with exactly the same set up and it weighs 10.5 kg, so the aluminum frame set is approx. 2 kg lighter.

No, it cannot be that light.

Here's some measured data:
Brompton steel parts (C-line): Main frame 1980 Fork 565 Rear triangle 755 Handlepost 755
Brompton titanium parts (T-line): Main frame 1207 Fork 276 Rear triangle 461 Handlepost 485
Aceoffix Aluminium (old version): Main frame 1470 Fork 450 Rear triangle 540 Handlepost 660

T-line frameset (titanium/carbon) is roughly 1.6kg lighter than full steel frameset.
I think your (T-line shaped) aluminium frameset will be slightly heavier than that.

I did weighed the aluminum frame, and compared it with T-line frame. Almost the same.

I think I forgot to calculate telescope seat posts (aluminum VS steel) and saddles (normal road bike saddle VS Brooks C17) of the two bikes, which cause approx. 400~500g weight difference.

I got several sets of these:


And this is the steel Brompton with similar components:



I do have lighter folding bikes (7.5kg titanium Brompton clone & 7.2kg Dahon Mu, for example), but now I am not that interested in extreme light weighting any more.
No heavier than 10kg is OK for me.

That is very interesting. Do you have detailed weights of t-line shaped aluminium frame?

it seems Chinese builders are really pushing the weight weenie boundary, they have carbon frames, partially 3d printed titanium frames and giga-pressed aluminium frames etc. Cool times.

I have some doubts about titanium 3D printed frames and frame parts: 3D printed parts are cheaper to produce but are usually heavier and have lower mechanical properties.

For aluminum, besides the weight, the stiffness is totally different than for titanium resulting in much more rigid frames without any vibration damping.

+ of course the well known problem of fatigue of aluminum.