Brompton electrification

[flecc]

And always leave the valve area until last when putting on any bike tyre, this to maximise the utilisation of the rim well depth.

 

[cwah]

Ok guys, just purchased few inner tube

Ready to fit it lol

 

[shemozzle999]

Link to Brompton's Own Tyre Change Technical Video

Ok guys, just purchased few inner tube

Ready to fit it lol

Follow this guide Cwah:

https://brompton.co.uk/technical/video.asp?d=3247

 

[cwah]

Thanks for all the advice guys. Tonight was a long night but I finally managed to fit the tyre without puncture..

This video is also very insightful for any marathon tyre fitting:
[video=youtube;-XUFVrl0UT4]http://www.youtube.com/watch?v=-XUFVrl0UT4[/video]



Now, I'm trying to fit the derailler to my bike, here is the result:

Have now 2 problems regarding the derailleur:
1. In order to have the chain tensionner wheel close enough to the chain, I had to remove all washers and protections between the axle and the forkend. Not sure if the dropout is going to be strong enough without that.
2. The derailleur chain pusher is stopped by the bolts on the motor. Not sure how I'm going to solve it yet. I can either shave the chain pusher or the motor bolts... I'm thinking about filing the chain pusher as it's a cheap part I can easily replace if I have any problem.

Thanks guys, it's definitely going toward the right direction

 

[shemozzle999]

2. The derailleur chain pusher is stopped by the bolts on the motor.


With the single speed set up you have got why not just unbolt it from the frame, you dont need it.

 

[jerrysimon]

I am pretty sure he won't be able to fold the bike without the chain coming off if he does not have the chain tensioner fitted. Even the single speed has one though it is different than the derailleur chain pusher on which the rollers can move laterally.

Come kind of anti rotation washer/torque arm would also be advisable. There are some retaining clip holes in the frame just behind the rear dropouts as well if I recall. I have a two speed which does not use them, but the hub drives have two washers that hold it in place if the nuts loosen. Same as that on the front wheel/dropouts.

Regards

Jerry

 

[shemozzle999]

1. In order to have the chain tensionner wheel close enough to the chain.

I think you need to buy the single speed chain tensioner from Brompton it is different to the one you have, the jockey wheels are in a fixed position and do not slide on their bearings - Part No. 9023004.

Link:

https://brompton.co.uk/technical/spares/category.asp?q=T5

 

[jerrysimon]

Yes that is the one I had on my three speed hub before I went to the two speed derailleur. Its made for one and three speed Bromptons.

Here they are at Brilliant Bikes

The real challenge though is going to be modifying it to go over the larger drive motor shaft and the larger wheel nut.

Regards

Jerry

 

[shemozzle999]

Duplicate posts Cwah, Jerry beat me to it.
The original nut could be be drilled out and tapped to the new thread size if there is enough material left after doing it.
It rather depends on the thread size of Cwah's hub shaft and how much it needs to be opened up.

 

[cwah]

Thanks guys.

So from what I understood I should:
- Buy the single speed chain tensioner
- and remove the chain pusher as it's only single speed?

 

[jerrysimon]

As I said earlier in my post the original chain pusher, cable and control lever on the handle bars can be removed as its no single speed as you say. Modifying the single speed chain tensioner will be a challenge.

I will re-emphasie though, that you are going to need some form of anti rotation fixing for that more powerfull motor.

Regards

Jerry

 

[Cakey]

I want your emoulton

 

[cwah]

hmm.. For chain tensioner I have to increase the nut hole size? Can I do that with a normal drill bit?

And maybe for the anti rotation fixing, if I glue some anti rotation washer on the forkend, would that work?

Maybe I first get the chain tensioner and see what needs to be adapted.

 

[jerrysimon]

I want your emoulton

To be honest if I could only have one it would be the eBompton. Not quite as smooth and comfortable as the Moulton, but better for all round use and portability.

Regards

Jerry

 

[shemozzle999]

What is diameter of your hub motor shaft Cwah?

 

[jerrysimon]

I have just checked my single speed tensioner and the shaft is not the problem (assuming it is 12mm) as the hole is big enough. The challenge is the cutout for the larger nut. The flange nut will have to be changed for a non flanged nut. The recess will have to be opened out and then its going to be hard to get it to lock flat plate on the dropout. Another nut will also be required on the other side of the tensioner to hold it in position.

That begs the question is the shaft long enough ?

Then again as the second nut is only holding the tensioner in place you could get a half sized nut which are available for the 12mm fine pitch threads, again assuming your motor has that size/threading.

Regards

Jerry

 

[cwah]

it's 10mm diameter. The standard size. It's slightly bigger than the one on the brompton.

 

[jerrysimon]

Is that 10mm across the flats or the shaft diameter ?

Regards

Jerry

 

[cwah]

I don't know what's the difference. How do I measure across the flats?

 

[jerrysimon]

cwah,

If you look at the shaft it should have to flat edges on it. Usually they are 10mm across but the other rounded sides are 12mm diam. The flats, slot into the square section dropouts to help prevent it rotating. Of course in many cases a torque arm/plate is required for anything other than lower powered motors.

Regards

Jerry