The New Brompton G Line Electric

guerney

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Will these cables wave about in high winds and be torn out by pedalling feet, or otherwise cause an accident? Could they have used coiled stretching cables similar to those on vintage phone handsets, or something else, along or through the frame instead?

 

Peter.Bridge

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Apr 19, 2023
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I meant he should re-spray the frame black!
It has more comedic effect when a 6'4" burly man in his 60s zooms around the village on a pink folding bike that is not obviously electric and races the local youths on their very expensive mountain bikes up the hill.
 

StuartsProjects

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but I don't think there's much difference in folded dimensions post-conversion, everything I've added which wasn't part of the kit swivels in and/or folds.
It would be an interesting comparison if you were to measure it, its only a few seconds to fold\unfold.
 

StuartsProjects

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Will these cables wave about in high winds and be torn out by pedalling feet, or otherwise cause an accident?
Never heard of them causing problems.

I have never had an issue myself, but I have only been riding Bromptons for 20+ years.
 

guerney

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It would be an interesting comparison if you were to measure it, its only a few seconds to fold\unfold.
It definitely folds larger than that new eBrompton, but the larger folded size is a reasonable tradeoff for much better mid-motored hill climbing ability, more range, higher level of pothole illumination, and much lower price. To measure it properly, I'd have to fold and hold it flat against the wall with a plank of wood - I'd do it if you were interested in converting a Dahon Helios P8 like mine using a BBS01B mid-drive, and was pondering whether it would fit inside your Peel P50 microcar with you... and if I had a plank of wood of suitable size. Or I could use a tower PC case. For me, it's enough that it folds sufficiently small to fit on end-carriage train luggage racks, buses, taxis etc.
 

guerney

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Never heard of them causing problems.

I have never had an issue myself, but I have only been riding Bromptons for 20+ years.
I worry dudes cycling with that newfnagled eBrompton offroad, would have those cables ripped out by a tree branch or infuriated leprechaun pedestrians.
 

guerney

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Put it in a corner and measure the limits with a 1M rule, or use a stick and pencil.
What's the point? It definitely folds larger than that new eBrompton, but small enough for my uses.
 

StuartsProjects

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My folded eBrompton (16" Wheels) is 35cm wide x 62cm high x 60cm deep.

I keep it folded under a table in my workshop, it took me 20 seconds to measure the dimensions.
 

StuartsProjects

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What's the point? It definitely folds larger than that new eBrompton, but small enough for my uses.
Useful information for those who consider folded size important for travelling etc, it might be 'bigger' but how much bigger ............
 

guerney

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Useful information for those who consider folded size important for travelling etc, it might be 'bigger' but how much bigger ............
It fits folded on trains, buses and in car boots.
 

guerney

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My eBrompton (16" Wheels) is 35cm wide x 62cm high x 60cm deep.

I keep it folded under a table in my workshop, it took me 20 seconds to measure the dimensions.
It's not much wider than quoted here:


...because the battery is narrower and shorter than the rear pannier rack, the saddle is higher than both (saddlepost slips down past the mid-drive to fold, holds the chainwheel off the ground), the motor is underneath and doesn't add to folded height length or width, chainwheel is smaller 52T vs the original 53T, and the magnetic clasps still close around the handlebar folded in between the wheels. It'll pretty much be the same aside for my wider tyres: 1.75" vs original 1.5".
 
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saneagle

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Will these cables wave about in high winds and be torn out by pedalling feet, or otherwise cause an accident? Could they have used coiled stretching cables similar to those on vintage phone handsets, or something else, along or through the frame instead?

They're the gear and brake cables. The electric cables run through the frame.
 

guerney

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They're the gear and brake cables. The electric cables run through the frame.
Going wireless with those would go some way toward justifying that stupid purchase price.
 

Bonzo Banana

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Sep 29, 2019
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The new Brompton looks lovely and I've followed some of the snippets of info that has been released along the way about the prototype model. Personally I wouldn't want the Alfine hub gears I would rather have the gearing arrangement of the original Brompton which is more bomb proof I think. The Alfine hub has probably helped push it to £2.5k for the conventional bike. Personally I would preferred simpler more reliable gearing and perhaps a £1500 price thereabouts. However in reality I have no interest in spending that much on a bike or ebike. You can make the case with the original Brompton that it is almost impossible to steal as you can take it with you wherever you go even sticking it in the supermarket trolley as you go around but this one seems to be a little too big for that I feel.

I certainly wish Brompton huge success with it though even though like most people I am priced out of considering it. I would not want to take the hit in money if stolen. Contrast it with the recent Argos ebike for £245 which again is a steel folding ebike with 20" wheels. Yes its a rubbish fold on that but still a comparable product of sorts. Two extremes of the same sort of product. Is the Brompton worth 12x the Argos ebike, to me it isn't but I'm sure to others it is. I realise the Argos ebike was a short term offer and now out of stock but still I feel it can be compared. One thing that is clearly superior about the Argos ebike is it has a height adjustable stem so can quickly adapt to a wide range of different height riders where as the Brompton you have to choose your fixed stem right at the beginning for you. Personally though if I spent £3.5k on it then I probably wouldn't be letting anyone else ride it anyway.

I love the nice thick tyres of the Brompton, could the Argos ebike take those? I think they are 20" x 2.1". The other huge benefit of the Argos ebike is easy and cheap availability of parts including the drivetrain and brakes. 7 speed chains are only £2.50 on Amazon (I realise the Argos ebike is 6 speed but can still use 7 speed chains). The electric Brompton in comparison has a 8 Speed Alfine hub combined with a hub motor in one unit, this sounds awfully expensive to replace for the electric version. It's expensive enough for the normal Alfine 8 hub. It feels like the non-electric version with a front hub motor conversion would be a better option in many ways. The electric Brompton front hub motors do fail on the original Brompton. Feels like hub gears and a hub motor combination is going to be a lot of hot/cold cycles and reasons to fail. The Alfine 8 speed hub is nowhere near as reliable as the Shimano Nexus 3 speed and you wouldn't expect it to be as its mechanically much more complex.

I guess its like any premium ebike you expect to pay premium servicing and repair costs as well. I wouldn't be surprised if a replacement hub motor/alfine unit was close to a £1k with fitting but I guess in the context of a £3.5k ebike that isn't terrible.

The original conventional Brompton is a fantastic bicycle and still a fantastic purchase. This feels to me like it could be a great option with different gearing. I remember seeing the Dahon version of the Brompton with a harsh aluminium frame, no weight savings but the option for more complex hub gearing and I thought at the time what an absolutely garbage product of little worth and sadly Brompton has moved slightly towards that with the Alfine gearing in my opinion which has compromised the durability and long lifespan of the product and upped the repair costs considerably.
 

guerney

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Why the alloy fork? Which specific alloy isn't mentioned, but why not the usual steel? Considering the lower end of stated range and the 345 kWh (in the Wired review) Wh battery, this new eBrompton possibly has a 12A to 15A torque sensing controller? It'll be hitting potholes at 25kph with alloy forks, and no front suspension other than the 2.1" wide tyre. Hope the alloy isn't mostly composed of prone to fatigue and cracking aluminium...
 
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guerney

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Sep 7, 2021
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I love the nice thick tyres of the Brompton, could the Argos ebike take those? I think they are 20" x 2.1".
My Dahon's rims can (made for Tern, sold by CH Whites), but it'd be a tight squeeze at best with the existing mudguards, which is one reason why I haven't fitted 2.125" Schwalbe Big Ben Plus yet. The other reason being Marathon Plus don't seem to wear out.


 
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Bonzo Banana

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Sep 29, 2019
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Why the alloy fork? Which specific alloy isn't mentioned, but why not the usual steel? Considering the lower end of stated range and the 345 kWh (in the Wired review) Wh battery, this new eBrompton possibly has a 12A to 15A torque sensing controller? It'll be hitting potholes at 25kph with alloy forks, and no front suspension other than the 2.1" wide tyre. Hope the alloy isn't mostly composed of prone to fatigue and cracking aluminium...
I must admit I was a bit disappointed with the alloy fork and was expecting a steel fork with a taped and curved blade like traditional steel forks that give a bit of suspension but I guess they went for an overbuilt aluminium fork for lightness. As you say it won't be that comfortable but despite the front suspension on the front of many bikes unless you go off-road its far more important to have suspension at the rear where most of the riders weight is.

Also I found out shortly after posting my previous comment that the Brompton G line electric model has a 4 speed geared hub incorporated into the motor hub so different to the standard G line. This gives the standard G Line some gearing advantages especially if you fit a front hub motor kit. However still not keen on the 8 speed Alfine hub, would have preferred a 3 speed with the 2 speed derailleur setup. I'm not spending £2.5k on such a bike anyway but just my preference if I won the lottery etc.

Also pretty sure Dahon or Tern don't make rims they will buy them from another manufacturer. I think rims are normally sold as wire by big manufacturers and then the real bike manufacturer would cut them and lace them etc. I don't any of that is done by Dahon or Tern. When I saw a video about Dahon's first factory which was in China it was mainly an assembly plant with only a tiny amount of frame welding in one corner with pretty much all the frames coming in from another factory (fuji-ta?). I guess they just wanted to claim to be a real factory so make a handful of frames themselves. There is a video of it on youtube unless they have removed it.
 

guerney

Esteemed Pedelecer
Sep 7, 2021
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I remember seeing the Dahon version of the Brompton with a harsh aluminium frame, no weight savings but the option for more complex hub gearing and I thought at the time what an absolutely garbage product of little worth and sadly Brompton has moved slightly towards that with the Alfine gearing in my opinion which has compromised the durability and long lifespan of the product and upped the repair costs considerably.
Crap by all accounts, but the hub gear OLDs suggest rear dropouts are likely 135mm (haven't measured), unlike Bromptons, which might be of interest to rear hub motor inclinator types.


Also pretty sure Dahon or Tern don't make rims they will buy them from another manufacturer.
Yes I said they were:

made for Tern

Is the Brompton worth 12x the Argos ebike, to me it isn't but I'm sure to others it is.
Personally though if I spent £3.5k on it then I probably wouldn't be letting anyone else ride it anyway.
£3.5K is totally bonkers! It's only a steel framed hub motored folding bike with a torque sensing controller! No wonder Brompton and pals are doing their damndest at this very moment to make cheap but decent and user repairable alternatives like the Argos bargain folder illegal.
 
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