German Engineering at its Best

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Ravi, how do you compare the Dapu 350W with the new ST2 motor??
 
I would really like technical specs as to the watt drain difference between belt and chain. It's well documented in motorcycling that a Gates belt robs horsepower to the rear wheel more than a chain. With a motorcycle it's insignificant due to the amount of available power. I wonder with a 250w-350w ebike, how much power/range is lost.
 
My 350watt geared rear hub, going up a hill >5% grade isn't really able to do more than 11 to 13 mph, even with me pedaling. That's what I've noticed.
 
PowerMe said:
My 350watt geared rear hub, going up a hill >5% grade isn't really able to do more than 11 to 13 mph, even with me pedaling. That's what I've noticed.
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Really, I can pedal up an 18% grade at 18mph on my Neo Carbon and about 23 mph on flat ground. Do you have an Easy Motion bike??
 
J.R. said:
I would really like technical specs as to the watt drain difference between belt and chain. It's well documented in motorcycling that a Gates belt robs horsepower to the rear wheel more than a chain. With a motorcycle it's insignificant due to the amount of available power. I wonder with a 250w-350w ebike, how much power/range is lost.
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There is 1-2W of drivetrain power loss using a gates carbon drive belt, however, that's in comparison to a well-lubricated chain, and since not all chains are optimally lubricated, the truth is that it's a wash. Belts and chains are roughly equivalent. The 1W loss would make a substantive difference for people who are only capable of producing 10W of power, but since most cyclists put out 75W-250W, I don't think that the 1W loss is big enough to matter.
 
Cameron Newland said:
There is 1-2W of drivetrain power loss using a gates carbon drive belt, however, that's in comparison to a well-lubricated chain, and since not all chains are optimally lubricated, the truth is that it's a wash. Belts and chains are roughly equivalent. The 1W loss would make a substantive difference for people who are only capable of producing 10W of power, but since most cyclists put out 75W-250W, I don't think that the 1W loss is big enough to matter.
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Is this information available? Who compiled it and on what equipment? I'd like to read it. The loss of power from just the belt on a motorcycle is 10-12% more than an o-ring chain. The belts are essentially the same.
 
I ride a belt driven bike and can't really tell the difference between my chain powered bikes. Just that it is a huge PIA to change a rear tire. I have done that tonight and managed to mess up the rear wheel ... it's going to LBS tomorrow. Tire is changed but belt is inoperable :) I'm a lousy mechanic. :)
 
Brambor said:
I ride a belt driven bike and can't really tell the difference between my chain powered bikes. Just that it is a huge PIA to change a rear tire. I have done that tonight and managed to mess up the rear wheel ... it's going to LBS tomorrow. Tire is changed but belt is inoperable :) I'm a lousy mechanic. :)
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I'm afraid of experiencing that issue myself. To me, belt drives seem like the way to go, but apparently, the belt tension and belt alignment are both rather finicky and need to be adjusted to optimize performance and longevity, and as you said, taking off the rear wheel is a pain. I assumed that it would be easy, what with the purpose-built rear dropout that separates, but apparently it's not as easy as I assumed!
 
Every unique or new mechanical execution requires a learning curve of do's and don't's. From what I understand Gates technical support is excellent and I am sure that with a little training removing/adjusting the belt will be a no brainer.

http://www.gatescarbondrive.com/tech/resources
 
So bummed that release date has been pushed to Q1 2016.
 
86 and still kicking said:
Thought I would share with you a photo of a redesigned stem that provides a hidden conduit for cabling to keep the look of the bike very clean.

The Model is a 2016 Kalkhoff Aventura Speed 1.0 and contains version 3 of their Impulse Drive. The bike now has 80nm of torque and runs quieter. In addition the display has a USB port for charging plus it will show turn by turn navigation.

I have to wait until the fall to receive, but I have no problem waiting.
View attachment 3325
View attachment 3326
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Gorgeous bike!
 
opimax said:
Does the Focus have an in tube battery version as the Karlkhoff?
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Their 2016 models will have semi-integrated batteries. I have seen them and I think they will arrive here in the US sometime late spring 2016.
 
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