Foldable bicycle

[Victor68]

[Victor68]

Btw someone gives me this bicycle trainer which I don't use. Anyone interested contact me. Can collect at my place. 

[Rayleigh]

On 6/1/2025 at 9:09 PM, Heartlander said:

I like Brompton design but really hate the internal gear hub. Granted it has its benefits like relatively maintenance free, but too many steps just to take out the rear tyre to replace inner tube. After a brief spell with burst inner tube every other week I got phobia just taking the bike out. And I always got the feeling that the cable tension on internal hub is not aligned properly thus gearing not correct, which happened time to time. So eventually got the alunminum G 山寨版 with external gear system haha.

i did experience tube puncture every alternate week. Turned out the culprit was the rim tape. The internal hub has only three gears, should be able to sense easily. 

Edited June 2, 2025 by Rayleigh

[Heartlander]

Mine was not due to rim tape but inner tube. I got a few of the TPU superlight inner tubes to experiment as curious about the improvement that saving of 100gm can make to the riding experience. Not bad but ended up the inner tubes keep bursting most likely due to improper tyre pressure. I checked the inner tubes and realised that the certain parts are easy to burst due to difference in material thickness which could be design reason. After finished up the stock, revert back to rubber inner tubes that can last much much longer. But that really made me hate the inner gear mechanism and eventually ditched it for a external gear bike. To replace inner tube, simply pry open the quick release lever of the wheel and can take out the wheel directly due to disc brake design. Simple as that! Inner gear design have to change the gear to correct one, remove the gear cable, use tool to remove the wheel nut, then take out the gear cable jig/adaptor, then reverse the procedure to fix it back after repair. Very 麻烦。Just to remove the wheel, it is a 1min job versus 20min job. Glad no longer need to deal with it anymore.

[inlinesix]

On 6/2/2025 at 9:14 AM, Heartlander said:

Mine was not due to rim tape but inner tube. I got a few of the TPU superlight inner tubes to experiment as curious about the improvement that saving of 100gm can make to the riding experience. Not bad but ended up the inner tubes keep bursting most likely due to improper tyre pressure. I checked the inner tubes and realised that the certain parts are easy to burst due to difference in material thickness which could be design reason. After finished up the stock, revert back to rubber inner tubes that can last much much longer. But that really made me hate the inner gear mechanism and eventually ditched it for an external gear bike. To replace inner tube, simply pry open the quick release lever of the wheel and can take out the wheel directly due to disc brake design. Simple as that! Inner gear design have to change the gear to correct one, remove the gear cable, use tool to remove the wheel nut, then take out the gear cable jig/adaptor, then reverse the procedure to fix it back after repair. Very 麻烦。Just to remove the wheel, it is a 1min job versus 20min job. Glad no longer need to deal with it anymore.

I am using TPU tube in roadie. I had 1 - 2 puncture in rear tyre due to incorrect Tyre pressure.

From thereon, puncture due to Tyre wear.

[Krieger]

On 2/12/2023 at 12:46 AM, Atonchia said:

Rifle Range Rd is nice 

Inside NTU also quite a lot of climb.

It is nice to ride along Rifle Range Rd. But please be careful of the cars in the evening. Almost got killed by a speeding car around a bend there last week. Darn.

[Atonchia]

On 6/2/2025 at 9:39 AM, Krieger said:

It is nice to ride along Rifle Range Rd. But please be careful of the cars in the evening. Almost got killed by a speeding car around a bend there last week. Darn.

Usually will only go early weekend morning. Less speeding car.

[Victor68]

Hi, it is me again asking for advice. Recently this screw broke off and I fell over. Although I have both screws replaced, I just feel the detailing is bad. How could such an important joint be holding by 2 screws? With vibrations and constant humps, it will get loosen or break again. Anyone has replaced it with anything else or is this design ok?

I am sure there are many such bicycles and wonder it is just mine that experience this. 

[Victor68]

Hi, it is me again asking for advice. Recently this screw broke off and I fell over. Although I have both screws replaced, I just feel the detailing is bad. How could such an important joint be holding by 2 screws? With vibrations and constant humps, it will get loosen or break again. Anyone has replaced it with anything else or is this design ok?

I am sure there are many such bicycles and wonder it is just mine that experience this. 

[Victor68]

[serenade]

The bolt is  being used as a structural member. You have to replace it with a more expensive forged bolt, not a machined bolt. Also since it will be subjected to movements and vibrations, apply Loctite Blue to the bolt before fastening. Loctite Blue will make sure the bolt does not loosen accidentally.

 

[inlinesix]

Buy Brompton👍🏻

I never have this problem despite rough use.

[Victor68]

On 11/29/2025 at 3:24 PM, serenade said:

The bolt is  being used as a structural member. You have to replace it with a more expensive forged bolt, not a machined bolt. Also since it will be subjected to movements and vibrations, apply Loctite Blue to the bolt before fastening. Loctite Blue will make sure the bolt does not loosen accidentally.

 

Where to buy this 'forged bolt' with the right dimensions?

Currently, the bicycle shop has replaced with stainlessness steel one I believe. The current design is just 2 stainlessness steel screws fasten at both ends of the open shaft, instead of the 'rod' going through the whole length taking the entire weight/stress. 

[Victor68]

On 11/29/2025 at 3:31 PM, inlinesix said:

Buy Brompton👍🏻

I never have this problem despite rough use.

Of course there is a big price difference here. Even if they have used a cast iron rod, it would still do the job instead of just 2 screws at the end holding this. 

I am just hopping if there is any hardware shops with such a piece of bolt I can buy to modify.

[Heartlander]

On 11/29/2025 at 3:31 PM, inlinesix said:

Buy Brompton👍🏻

I never have this problem despite rough use.

My Brompton clone have this problem. I learnt to tighten it every few months. To me is part of maintenance routine.

[Mkl22]

On 11/29/2025 at 6:27 PM, Victor68 said:

Where to buy this 'forged bolt' with the right dimensions?

Currently, the bicycle shop has replaced with stainlessness steel one I believe. The current design is just 2 stainlessness steel screws fasten at both ends of the open shaft, instead of the 'rod' going through the whole length taking the entire weight/stress. 

Put locktite. Use the red one. 
remove the bolt. Spray brake cleaner to clean up the threads. Put red locktite on half the bolt then put it in and tighten. 
done. 
 This is actually a pivot joint. Usually will be supported by bearings.
This one here is a cheapo design. Just have to locktite and make do. 

Edited November 29, 2025 by Mkl22

[inlinesix]

On 11/29/2025 at 7:30 PM, Mkl22 said:

Put locktite. Use the red one. 
remove the bolt. Spray brake cleaner to clean up the threads. Put red locktite on half the bolt then put it in and tighten. 
done. 
 This is actually a pivot joint. Usually will be supported by bearings.
This one here is a cheapo design. Just have to locktite and make do. 

On a Brompton, there is no bearing.

The way it lock is similar to T47 BB.

[inlinesix]

On 11/29/2025 at 6:29 PM, Victor68 said:

Of course there is a big price difference here. Even if they have used a cast iron rod, it would still do the job instead of just 2 screws at the end holding this. 

I am just hopping if there is any hardware shops with such a piece of bolt I can buy to modify.

To me, this is a design failure.

Since you fell because of it, I will sell the bike.