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Yet another titanium Brompton build

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Yet another titanium Brompton build

Old 04-10-19, 12:53 PM
  #1  
Raxel
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Yet another titanium Brompton build

I have suddenly realized that I have amassed enough Brompton parts to build a whole bike... so I did.
Only the main frame is titanium, and rest of the bike are steel.

The tires were much heavier than expected (sample variance) so I end up missing the sub-7kg target weight though.
(I am still waiting for titanium bolts for brakes which may shave ~40gr)




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Old 04-10-19, 03:13 PM
  #2  
univega.duder
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Wow Raxel- this one looks great! Is that the 3sixty frame? Did you have any issues putting it together?
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Old 04-10-19, 08:27 PM
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Thatís beautiful. I want it.
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Old 04-11-19, 03:47 AM
  #4  
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Nicely done!
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Old 04-12-19, 01:04 PM
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How much cost titanium frame? I can not find any open auction on ebay.
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Old 04-12-19, 03:46 PM
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Lots of them on e-bay you just have to look. Some are buy it now. Most a $1200 to $3000 range. Roger
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Old 04-12-19, 04:43 PM
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Does the ti frame use a metal seat post shim/sleeve or a plastic one like the Brompton original?
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Old 04-13-19, 05:18 AM
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Mcarto
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Originally Posted by rhenning View Post
Lots of them on e-bay you just have to look. Some are buy it now. Most a $1200 to $3000 range. Roger
Yep but not on the 3sixty frame, I also found a lot of frames from various manufacturers on Alibaba.
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Old 04-13-19, 09:32 AM
  #9  
Raxel
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Originally Posted by Mcarto View Post
How much cost titanium frame? I can not find any open auction on ebay.
Main frame usually costs around $900~1K.

Originally Posted by chagzuki View Post
Does the ti frame use a metal seat post shim/sleeve or a plastic one like the Brompton original?
Most titanium third party frames uses CORK sleeve which seems to grab the seatpost much better than stock plastic ones.
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Old 04-13-19, 11:38 AM
  #10  
chagzuki
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Originally Posted by Raxel View Post
Most titanium third party frames uses CORK sleeve which seems to grab the seatpost much better than stock plastic ones.
Interesting. I wonder how long it lasts. Does it need to be glued in place?
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Old 04-13-19, 08:47 PM
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How is the rear hinge part done? Do you use Brompton parts for that? Or the titanium rear hinge comes with its own bushing and bolts. Also I think for the Brompton, you need some funky reaming tool to complete the job.
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Old 04-13-19, 11:56 PM
  #12  
kidshibuya
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Usually I see bromptons as bikes for old ladys but this one looks cool, good job.
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Old 04-16-19, 11:20 PM
  #13  
Raxel
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Originally Posted by dahoneezz View Post
How is the rear hinge part done? Do you use Brompton parts for that? Or the titanium rear hinge comes with its own bushing and bolts. Also I think for the Brompton, you need some funky reaming tool to complete the job.
Titanium main frame comes with hinge bushing and seatpost sleeve pre-installed, and they are already reamed. One needs the hinge and hinge bolts though (There are lightweight aftermarket ones)
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Old 04-17-19, 06:01 AM
  #14  
dahoneezz
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Thank you for the reply.
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Old 04-17-19, 09:57 AM
  #15  
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Originally Posted by kidshibuya View Post
Usually I see bromptons as bikes for old ladys but this one looks cool, good job.
Hey! I resemble that. lol.
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Old 06-15-19, 09:47 PM
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Hi Raxel. Where did you purchase the expander cone for the quill stem? It does not come with the quill stem and I only seem to be able to find the bolt online.
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Old 06-17-19, 02:30 PM
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UFB may be only one..

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Old 06-17-19, 02:34 PM
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Old 06-17-19, 03:02 PM
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Originally Posted by fietsbob View Post
is this a flamingo brompton knockoff?
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Old 06-17-19, 03:38 PM
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Flamingos were Asia aluminum, this is cusrom Titanium .. un cheap .


Leonard Rubin's Own Bike see: facebook.com/UltimateFolder..

he posted pictures of the electronic shifting ..

Last edited by fietsbob; 06-17-19 at 03:42 PM.
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Old 06-17-19, 07:46 PM
  #21  
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Originally Posted by fietsbob View Post
Flamingos were Asia aluminum, this is cusrom Titanium .. un cheap .


Leonard Rubin's Own Bike see: facebook.com/UltimateFolder..

he posted pictures of the electronic shifting ..
oh, sorry, i didnt knew his work.
the toptube seems massive, or its just my eyes?
titanium seems more flexy that steel and alluminium, so make more sense they need to make thicker tubes...right?.
the tubbing is my main question against razels titanium brompton...does it flex more?
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Old 06-17-19, 11:07 PM
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I expect he specified it for added stiffness, since the alternative in TI

with a same as steel outside diameter would requite a much thicker tube wall..

95 pound asians may be fine with a noodly frame as long as they weigh less..
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Old 06-18-19, 01:42 AM
  #23  
Raxel
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Originally Posted by fietsbob View Post
I expect he specified it for added stiffness, since the alternative in TI
with a same as steel outside diameter would requite a much thicker tube wall..
95 pound asians may be fine with a noodly frame as long as they weigh less..
a) Brompton (as well as the UFB) has rear suspension, which will give WAY more than any possible frame flex anyway.
b) Fork and rear frame has much thinner tubing than the main frame, and they flex way more than main frame.
c) Long seatposts (especially carbon or titanium ones) flex a lot too.
d) Many people that weigh ~200lbs are riding their titanium brompton (clones) now and say they feel just the same as the original steel ones.

Last edited by Raxel; 06-18-19 at 01:46 AM.
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Old 02-19-20, 02:59 PM
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Raxel you installed the forged crankset (3sixty and other brands) from Aliexpress, right? Is it the square taper model or the GXP with axle and are you happy with it? I want to replace my Miche crankset, as it's ugly and scratches the rear triangle in folded position. I can't post links yet...
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Old 05-19-20, 06:09 PM
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Originally Posted by Raxel View Post
...
(I am still waiting for titanium bolts for brakes which may shave ~40gr)

...
Hi Raxel,

When swapping the brake caliper bolts to titanium, is it advisable to apply anti seize or medium thread lock? Also, do I follow the default torque values set by Brompton in the user manual?
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