There are several types of KlickFIX though. For example, there's the type that latches to rear rack rails; I have that on my Vincita Big Nash rack bag. I think there's another type of front bag too. It's sometimes hard to tell which bags go with which type of KlickFIX.

I started out trying a Rixen & Kaul backpack with a KlickFIX for the front. I think it was designed for their handlebar mount, because when I mounted it on the head tube KlickFIX mount, it was high enough to obstruct the headlight on my Vektron, unless I had the bar most of the way towards its highest position.

The filter on their website means that you can select handlebar mounted bags, which are the ones that work on head tube mounts.

Yes, for me, that is exactly the question; I can replace the adapter, but not repair damage to the front block. Only on Bromptons is the block brazed to the head tube. Everyone else welds the block on, to steel or aluminum, and with Tern, Zizzo, later Dahon, et al, they are all aluminum, and aluminum is more subject to fatigue stress than steel. And, weld repair to aluminum where there is a fatigue failure, is sketchy, as the area is not heat-treated after welding to fully restore strength, though this is more critical on 6061-T6, whereas the later 7005 frames do not require heat treat after welding. Still, not something you want to mess with, best to avoid if possible.

Regarding the cable clearance, I see a lot of folders that have all the cables spiral-wrapped together, which makes the bundle protrude forward. I prefer to keep right and left cables separate, which allows the cables to lay more flat across the front (with flat-bar levers), right cables crossing to left side of frame tube, left cables cross to right side of frame tube, so clear in front of head tube, and clearance to a bag is not a problem, even with a closer Brompton-style bag mount.

Due to the cantilever effect, I think that the 10kg, = 3kg heavier load, allowed in a Brompton type bag mounted on a Brompton type block directly attached to the brazing of the head tube like the blocks sold on Aliexpress won't generate higher constraints on the brazing-threads (especially the one of the top bolt) than the 7kg allowed in a Klickfix bag mounted on the long Tern Luggage Truss.

Moreover, this 7kg weight limit, that exists for all Klickfix front bags not only the one of the Tern Luggage Truss, is most probably due to the Klickfix system and not to the brazing.

I obviously went onto AliExpress after a few beers because these two mounts arrived this week:




the red mount extends the pig nose adapter thingy below up and away from the cabling:



So yeah, now it looks like I am in the market for a Brompton-block compatible rucksack. 10 litres should do it. Alternatively I may get a front mount rack and use one of the thousand rucksacks we have kicking around the house that the kids have accumulated over the years.

I will post a photo of it mounted on the front of the Tern later. I am impressed by the perceived quality of the AliExpress kit.

Oh, and I was away working with the Tern this last week, here it is in full professional mode, two panniers, and an Eastpak rucksack/garment carrier thing.

I have a piano and a bunch of flowers in there too, because opera.



Fits nicely in the gap between the carriage door and the end seat row.

All bolts secured with thread locker.

I would have preferred some recommended torque settings but none were provided.

I prefer the block mounted directly against the head tube without the adapter that adds a long lever! This system has the same problem of than the Tern Luggage Truss.

On the Tern Vektron S10, no problems with the cables.

Front rack is a solid pick