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The chain tensioner is not yet aligned with the chain: I'll have to keep filing the chain tensioner inside to allow it to go closer to the bike.. Will keep doing that tomorrow. Now my biggest problem is that I've put too much strenght when I tried to tighten the motor shaft bolt. Now it's...

I'm lucky, I received the new Marathon "greenguard" tyre and they are thinner than the standard tyre. The tyre isn't rubbing anymore with the rear fork: Just sometime I hear a minor sound but that should be ok :) I'm trying to put the chain tensionner on top of the torque arm:

More info about the build. It's my crazy night build topic :) I'm now adding all the torque arms to my bike. I've 2 anti-rotation washer and: - Conhistmotor torque arm (thinner) on the gear side: - Cyclezee torque arm (stronger) on the other side: This configuration should be enough to...

Guys, the nightly update about my brompton build: I installed the rear rack with easy wheel... now my brompton rolls once folded!!!! Yeeeeey :) However, installation of the rear rack was quite tought, dimension were different and I had to force a bit... and a result it narrowed the...

I'm sooo close to completion. I spent so much time on it. I really have to make this bike live! That's going to be the first brompton with rear motor on it!! Jerry, sorry for the misunderstanding, I will certainly not reach 30 mph. I'm planning to have an usual speed around 20-23mph. But for...

And I can probably file the derailleur in order to fit the anti-rotation washer:

I have 28 mm to play with: When the derailler is fitted, I still have a bit of space:

Just did all the pictures: Shaft flat width of 10mm: Shaft max width of 14mm: That's quite a big shaft, but at least I know it's tought

I really want to ride at 30 mph!! it's going to be too slow otherwise! I'm going to beef up the forkend as much as possible. Your advice are really really helpful and will allow me to run safely at 30 mph! It's not that fast, and much more secure when all cars are trying to go faster than...

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

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

Ok thanks Pedalo. I'm looking for a BPM or something similar so applying maximum power initially shouldn't be a problem. Too bad the Tongxin isn't strong enough.

I'm thinking about potentially get a geared motor later for the torque and freewheel. Something somewhat faster than the tonxing that could go at 40-50kph. The problem is that geared motors are not made to handle more than 500RPM.. so wondering when you broke your first motor, was it...

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.

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?

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: http://www.youtube.com/watch?v=-XUFVrl0UT4 Now, I'm trying to fit the derailler to my bike, here is the...

Ok guys, just purchased few inner tube Ready to fit it lol

Yeah, I put some air before trying to put the tyre, but it was so difficult I decided to remove the air in order to have more space lol

Thanks John, that's really kind of you. And no worries, filling the cross piece doesn't seem to be complicated at all :) For now, my biggest challenge is to manage to fit the tyre into the rim. Punctured 2 tubes and already indented my rim trying to do that this afternoon lol.

Found the Big Apple tyre for Dahon curve (16") here: Schwalbe Big Apple kevlar belt tyre 16 x 2.0" for Dahon curve - Brilliant Bikes Any idea if that can fit the brompton?