Currently building my dream Brompton here in Berlin and wanted to share the journey! Still working on the full conversion, but I've already solved some major G-Line pain points.
š²š§ MY ULTIMATE G-LINE COMBO SOLUTION!
You G-Line owners know the struggles: Too heavy (mine's currently 14.75kg!), too big, keeps rolling away… š¤
My DIY Engineering Solution:
Part 1: Fantastic4 Easy Wheels Extender Bar
– Wider rolling track = super stable when pulling
– No more tipping during transport
– Orange aluminum that catches eyes! š„
Part 2: Self-made rubber stoppers
– Rock-solid standing without rolling away
– Perfect for bus, train & parking
– Finally works like those 16-inch Bromptons!
The Result: G-Line with superpowers! š
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Smooth rolling
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Secure standing
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No more public transport stress
The Full Build Plan (WIP):
Heart of the Build: ā
COMPLETED
– Shimano Alfine hub gear + Gates carbon belt drive
– Kinetic conversion kit from UK (Brompton-specific)
– Result: Silent, low-maintenance perfection achieved!
Design & Performance Upgrades:
– Racing Green frame with orange accents
– Orange Woodman components + Ridea wheels
– Brooks leather saddle in cognac
– Schmolke carbon handlebar & seatpost (German engineering!)
– Silverock carbon fork
– Schwalbe Big Apple 20×2.15" tires
Current Status
Transport solutions: ā
SOLVED
Belt drive conversion: ā
COMPLETED
Weight reduction: š IN PROGRESS
Full aesthetic build: š PLANNED
While others are still fighting with standard G-Line problems, I'm engineering my way to the perfect urban folder!
To all G-Line riders: This is how you solve problems! Who else has developed creative mods? And any tips for getting that weight down from 14.75kg?
by Jazzlike-Ad-3388
7 Comments
I like it. Did the weight drop any?
So far, I’ve been able to reduce the weight from just under 16 kg to 14.75 kg. Unfortunately, the rear swingarm and the Alfine hub dictate the weight. But I’m working on it!
Nice, did you measure how much weight the carbon forks saved over the aluminium ones?
I think the thinner conti urban contacts would save a bit of weight and have better rolling resistance. TPU tubes as well.
Carbon cranks and BB would save weight as well.
if u are serious about weight reduction, u should reconsider Brooks leather. get your sitbones measured, and match it with the right saddle shape and width for you type of riding. if it will be just as good, if not better, as a contoured leather saddle but weighing just 30-40% of Brooks.
if u ride on mix surfaces, billy bonkers 20×2.0 performance addix is pretty sweet and fast, and about 150g lighter per tyre than your big apple, iirc.
Iād agree on the cranks, I saved 197g switching from stock to Brompton superlight cranks (which are pretty porky) carbon rims saved 60g a pop which nicely cancelled out the dynamo I added
On the folded pic the belt looks to sit quite loose over the pulley. Does that work well?
Excellent choice in handlebar and seatpost only carbon manufacturer I’d trust on a Brompton.