Originally Posted by Raxel

First I agree that the weight shaving potential with Helix frameset is not quite good. The design forces non-common 507 wheelset (much less common than 520), which cannot be switched with larger size due to the tight clearance.

The lefty fork only accepts much heavier disc brake system. And you cannot really shave much from the drivetrain either.


And here are some weight breakdown for steel and titanium Bromptons:


Steel frame/fork/rear triangle /stem /seatpost : 2000 + 550 + 780 + 730 + 540 = 4.6kg

Titanium frame/fork/rear triangle/stem/ $40 Carbon seatpost: 1280+280 + 430+460+240 = 2.7kg


Add ~6kg for boat anchor stock Brompton parts

Add ~4kg for cost-effective lightweight parts (wheelset, tire, pedal, saddle, brake lever, hinge clamps etc)

Add ~3kg for extensive but non-bouqitue lightweight parts (which will make 5.7kg full titanium brompton I have built)

Add ~2.5kg for crazy light parts (Clavicula, AX Orion, Schmolke handlebar/seatpost, Extralite hub, carbon rim, ti spoke etc)


So actually the weight loss with boutique German carbon parts are not worth the money. Clavicular SE is only ~120gr lighter than cheap Aceoffix crankset for example.