Dahon Speed D7

[Wattever]

I am going 50 km/h on a 200W rear geared hub, 12S Lipo, folding bike with rear suspension, the motor does'nt get hot, only slightlly worm, I tried putting the controller inside the battery bag, but it got really hot after a hard ride (a 450W 9 FET controller from bmsbattery, 22A limited), so I moved to a 12 FEt controller and put it outside the bag, the motor still handles the 30A without getting hot.

[SamTexas]

I am going 50 km/h on a 200W rear geared hub, 12S Lipo, folding bike with rear suspension, the motor does'nt get hot, only slightlly worm, ...

Sounds interesting. Wattever, which hub is it? Do you have a picture and/or a link? I'm really interested.

Do you know the power (wattage) at 50km/h?

[Wattever]

The power @ 50km/h is arround 1000W (I am not pedaling), I weight 87Kg and I am taking my son with me in the mornings - he weights about 15Kg, it does not affect much, but I am not going 50 with him on.

I bought the motor from a local importer in Israel, so I can'y say which brand it is - see attached pic. My friend followed my overvolting with a 24V 250W motor from another unknown factory, and it works as good as mine. we are using them for 3 months now, all is well.

[cwah]

Wattever, are you sure it's a 200W motor? The motor seems quite big and looks bigger than RVD 350W motor.

Actually, the size is comparable (or slightly bigger) with my 250 W direct drive motor:

[RVD]

cwah, just fyi, the Dahon Speed may or may not be the best option for you. Dahon uses a lot of proprietary parts (derailleur, etc.) and the community is generally unhappy with parts not being available after they go back. Thinking back, I would also look into using a xootr since those use standard parts.

The rear dropouts on the Speed are also a little small (133mm instead of 135mm) so it took a bit of wrestling to get the wheel in there.

The speed at $650 is also a bit pricey. But it does come with a pre-installed rack and fenders. And yes, I think it looks nice.

[Wattever]

I don't have its specs, just what's written on it: 24V200 and what I was told when I bought it. It weights 3Kg, I guess these motors are rated just to pass regulations.

The motor spoke holes diameter is 130mm is that your size?

[cwah]

RDV, I'm planning to purchase a second hand Dahon speed (or something similar). Unlike new technology (and batteries), bikes don't change that much over year. So purchasing a Dahon speed 7 at 350$ would be of great value. How do you do to change the part? Can you just get completely different derailleur for example?

I'm also considering the Downtube FS (http://www.downtube.com/Full_Suspension ... _Bike.html). But UK prices are high and it's difficult to find a second hand one.

Wattever, is the spoke holes diameter equivalent to the fork dropout size? I'm not sure how to calculate that. BTW, the MXUS 350W weight 3 kg and the Cute100 weight 2.1 kg.

[Wattever]

I mean the hub diameter between spoke holes ("d" in the picture)

[cwah]

Wattever, I just quickly mesured it with my ruler. The spoke holes diameter is around 130 mm. Same as yours.

[efold]

RVD, could you reuse your existing 7 gear cassette on the motor, or did you buy a new one?

[RVD]

sorry, haven't been around much but i did continue with the stock rear derailleur.