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Brompton like frame sets?

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Brompton like frame sets?

Old 12-26-22, 11:42 PM
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CEBEP
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Brompton like frame sets?

There are lotís of Brompton clones and Brompton modifications. People like how it folds but want more, like disk brakes, generic cassette/derailleur/hubs, thicker tires, bigger rims, different forks, different OLD rear triangle etc etc. I wander why asian producers do not offer a Brompton like frame sets like Fhnon?Offer a frame and separately few versions of fork/rear triangle/handlebars. Let people buy the rest and assemble the bike they want.

Last edited by CEBEP; 12-27-22 at 12:03 AM.
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Old 12-27-22, 09:42 AM
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Have you checked Aliexpress? There are many frames, forks, parts for folding bikes and minivelos made of steel, aluminum or carbon.
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Old 12-27-22, 09:52 AM
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Ti parts yes, but I didnít see listing with main frame made of metal. Also not sure about handlebar stem made of metal.
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Old 12-27-22, 04:15 PM
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All parts of the Brompton frame are available in titanium including the stem on ebay or aliexpress.

And there are several types of rear frame, with the original OLD or 135mm OLD, with or without disc brakes calipers mounting points.

Of course, you never know in advance the quality of the parts you will actually receive and the price of a complete frame when you add the prices of all parts isn't really cheap.
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Old 12-27-22, 07:41 PM
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CEBEP, is this what you are looking for? The knockoff steel frame components for a Brompton? Check out the SungDa Outdoor Shop on Aliexpress.


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Old 12-27-22, 11:09 PM
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Old 12-28-22, 01:40 AM
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Thanks, for some reason these didnít popup in my Aliexpress app.
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Old 12-28-22, 01:46 AM
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Originally Posted by Jipe View Post
All parts of the Brompton frame are available in titanium including the stem on ebay or aliexpress.

And there are several types of rear frame, with the original OLD or 135mm OLD, with or without disc brakes calipers mounting points.

Of course, you never know in advance the quality of the parts you will actually receive and the price of a complete frame when you add the prices of all parts isn't really cheap.
There are two mods Iíd want to have on my Brompton: disc brakes and big apple tires. The rest is not critical, like RD with cassette or 20í wheels. But even to do what Iíd like to upgrade Iíll need to buy new fork and rear triangle. And I donít want to modify the Brompton I already have, so it seems like a good idea to go for new frame, triangle, fork. I may look into it some day. I agree itís hard to say about quality, but Aceoffix is the brand I heard of and is widely available in Aliexpress. The only other option that I know of would be Kinetics but it would be the whole other price points and they donít sell main frame afaik.
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Old 12-28-22, 04:57 AM
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The problem is that to go to wider 50mm tires like the Big Apple, either you must accept smaller diameter wheels (ETRTO305 with 50x305 tires, even with these wider tires the overall wheel diameter is smaller than the original 35x349 diameter) or must accept to have a bigger folded size with 50x355 tires.
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Old 12-28-22, 05:11 AM
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Originally Posted by Jipe View Post
The problem is that to go to wider 50mm tires like the Big Apple, either you must accept smaller diameter wheels (ETRTO305 with 50x305 tires, even with these wider tires the overall wheel diameter is smaller than the original 35x349 diameter) or must accept to have a bigger folded size with 50x355 tires.
Iíve seen modified Bromptons with 20í wheels, folding size is not all that bigger, so itís fine.
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Old 12-28-22, 05:24 AM
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If you talk about the Kinetics 20" mod, it makes the folded Brompton higher and longer.

It remains one of he smallest 20" folding bike but its bigger than original, as big as a Birdy 3. This because the folded rear wheel comes against the frame tubes and bottom bracket box. If the wheel diameter is increased by let say 50mm, then the rear triangle length must be increased by about 25mm and the folded length and height are increased by about 50mm too.

So a part of the Brompton advantage is lost.

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Old 12-28-22, 05:27 AM
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Originally Posted by Jipe View Post
If you talk about the Kinetics 20" mod, it makes the folded Brompton higher and longer.

It remains one of he smallest 20" folding bike but its bigger than original, as big as a Birdy 3.

So a part of the Brompton advantage is lost.
After my Birdy I really miss disk brakes and a bit more cushy ride on Brompton

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Old 12-28-22, 06:09 AM
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Yes, I understand that even if in practice, good caliper brakes like the Ridea for Brompton provide sufficient braking.

The drawback of disc brakes is that they will always increase the weight, to have the real power of disc brakes, hydraulic disc brakes are needed (I have TRP disc on my Ti Birdy, they are lightweight but cannot compete against the cheap Shimano Deore of my Birdy 3) and even higher end, very expensive hydraulic disc brakes, weight more than lightweight rim brakes like the Ridea (and its possible to mount eebrakes that weight less and provide top notch braking).
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Old 01-04-23, 10:04 PM
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Originally Posted by CEBEP View Post
There are two mods Iíd want to have on my Brompton: disc brakes and big apple tires.
Something like...

https://eu.dahon.com/bikes/curl-i4-3/
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Old 01-04-23, 10:08 PM
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Originally Posted by Jipe View Post
The problem is that to go to wider 50mm tires like the Big Apple, either you must accept smaller diameter wheels (ETRTO305 with 50x305 tires, even with these wider tires the overall wheel diameter is smaller than the original 35x349 diameter)...
Brompton converted to 305x50s:

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Old 01-07-23, 10:24 AM
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57-306

You can try going bigger than 50mm wide tires on 305 rims. You can try, for example, 57-305 which is only marginally shorter than 37-349, but substantially cushier.
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